Service Diagnosis - SI20-701B - Service Manuals - English
Service Diagnosis - SI20-701B - Service Manuals - English
Service Diagnosis - SI20-701B - Service Manuals - English
Pocket
Manual
Service Diagnosis
SkyAir Series Si20-701_B
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Si20-701_B SkyAir Series
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SkyAir Series Si20-701_B
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Si20-701_B SkyAir Series
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SkyAir Series Si20-701_B
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Si20-701_B SkyAir Series
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List of Applicable Models Si20-701_B
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Si20-701_B List of Applicable Models
R-GA Series
Series Outdoor Units Indoor Units
R50GAV1A FH50BVE
R-GAV
R60GAV1A FH60BVE
R-G Series
Series Outdoor Units Indoor Units
R35GV1 FH35BVE
R50GV1 FH50BVE
R60GV1 FH60BVE
R35GV1 FHB35FV1
R50GV1 FHB45FV1
R60GV1 FHB60FV1
R-GV1
R35GV1 FHC35KVE
R50GV1 FHC50KVE
R60GV1 FHC60KVE
R35GV1 FHK35FV1
R50GV1 FHK45FV1
R60GV1 FHK60FV1
R35GV1A FHC35KVE
R-GV1A R50GV1A FHC50KVE
R60GV1A FHC60KVE
R50GVAL FH50BVE
R60GVAL FH60BVE
R-GVAL
R50GVAL FHC50KVE
R60GVAL FHC60KVE
R60GV1K FHC60KVE
R60GV1K FH60BVE
R-GV1K
R60GV1K FHB60FV1
R60GV1K FHK60FV1
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List of Applicable Models Si20-701_B
R-KU Series
Series Outdoor Units Indoor Units
R71KUV1 FAY71FAVE
R100KUV1 FAY100FAVE
R71KUV1 FHK71FV1
R71KUV1 FHY71BVE
R100KUV1 FHY100BVE
R71KUV1 FHYB71FV1
R-KUV1 R100KUV1 FHYB100FV1
R71KUV1 FHYC71KVE
R100KUV1 FHYC100KVE
R71KUV1 FUY71FJV1
R100KUV1 FUY100FJV1
R71KUV1 FVY71LVE
R100KUV1 FVY100LVE
R71KUY1 FAY71FAVE
R100KUY1 FAY100FAVE
R71KUY1 FHK71FV1
R71KUY1 FHY71BVE
R100KUY1 FHY100BVE
R125KUY1 FHY125BVE
R71KUY1 FHYB71FV1
R100KUY1 FHYB100FV1
R125KUY1 FHYB125FV1
R-KUY1
R71KUY1 FHYC71KVE
R100KUY1 FHYC100KVE
R125KUY1 FHYC125KVE
R71KUY1 FUY71FJV1
R100KUY1 FUY100FJV1
R125KUY1 FUY125FJV1
R71KUY1 FVY71LVE
R100KUY1 FVY100LVE
R125KUY1 FVY125LVE
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Si20-701_B List of Applicable Models
R-LU Series
Series Outdoor Units Indoor Units
R71LUV1 FAY71FAVE
R100LUV1 FAY100FAVE
R71LUV1 FAY71LVE
R71LUV1 FDYM03FAV1
R100LUV1 FDYM04FAV1
R71LUV1 FHY71BVE
R100LUV1 FHY100BVE
R71LUV1 FHYB71FV1
R-LUV1
R100LUV1 FHYB100FV1
R71LUV1 FHYC71KVE
R100LUV1 FHYC100KVE
R71LUV1 FHYK71FJV1
R71LUV1 FUY71FJV1
R100LUV1 FUY100FJV1
R71LUV1 FVY71LAVE
R100LUV1 FVY100LAVE
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List of Applicable Models Si20-701_B
5
Si20-701_B List of Applicable Models
6
List of Applicable Models Si20-701_B
R-NU Series
Series Outdoor Units Indoor Units
R18NUV1(4)(5) FDBG18NUV1(4)(5)
R21NUV1(4)(5) FDBG21NUV1(4)(5)
R26NUV1(4)(5) FDBG26NUV1(4)(5)
R26NUV1(4)(5) FDMG26NUV1(4)(5)
R30NUV1 FDMG30NUV1
R36NUV1(5) FDMG36NUV1(5)
R21NUV1(4)(5) FH21NUV1(4)(5)
R-NUV1 R26NUV1(4)(5) FH26NUV1(4)(5)
R30NUV1 FH30NUV1
R36NUV1(5) FH36NUV1(5)
R18NUV1(4)(5) FHC18NUV1(4)(5)
R21NUV1(4)(5) FHC21NUV1(4)(5)
R26NUV1(4)(5) FHC26NUV1(4)(5)
R30NUV1 FHC30NUV1
R36NUV1(5) FHC36NUV1(5)
R26NUY1(4)(5) FDBG26NUV1(4)(5)
R26NUY1(4)(5) FDMG26NUV1(4)(5)
R30NUY1 FDMG30NUV1
R36NUY1(4)(5) FDMG36NUV1(4)(5)
R42NUY1(4)(5) FDMG42NUV1(4)(5)
R48NUY1(4)(5) FDMG48NUV1(4)(5)
R51NUY1(4)(5) FDMG51NUV1(4)(5)
R56NUY1(4)(5) FDMG56NUV1(4)(5)
R26NUY1(4)(5) FH26NUV1(4)(5)
R-NUY1
R30NUY1 FH30NUV1
R36NUY1(4)(5) FH36NUV1(4)(5)
R42NUY1(4)(5) FH42NUV1(4)(5)
R48NUY1(4)(5) FH48NUV1(4)(5)
R26NUY1(4)(5) FHC26NUV1(4)(5)
R30NUY1 FHC30NUV1
R36NUY1(4)(5) FHC36NUV1(4)(5)
R42NUY1(4)(5) FHC42NUV1(4)(5)
R48NUY1(4)(5) FHC48NUV1(4)(5)
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Si20-701_B List of Applicable Models
8
List of Applicable Models Si20-701_B
9
Si20-701_B List of Applicable Models
R-PU Series
Series Outdoor Units Indoor Units
R30PUV2S FDBT30PUV2S
R33PUV2S FDBT33PUV2S
R36PUV2S FDBT36PUV2S
R30PUV2S FDMG30PUV2S
R36PUV2S FDMG36PUV2S
R-PUV2S R30PUV2S FDMG30NVV2S
R36PUV2S FDMG36NVV2S
R30PUV2S FH30PUV2S
R36PUV2S FH36PUV2S
R30PUV2S FHC30PUV2S
R36PUV2S FHC36PUV2S
R30PUY2S FH30PUV2S
R36PUY2S FH36PUV2S
R42PUY2S FH42PUV2S
R30PUY2S FHC30PUV2S
R36PUY2S FHC36PUV2S
R42PUY2S FHC42PUV2S
R30PUY2S FDBT30PUV2S
R33PUY2S FDBT33PUV2S
R-PUY2S R36PUY2S FDBT36PUV2S
R42PUY2S FDBT42PUV2S
R30PUY2S FDMG30NVV2S
R36PUY2S FDMG36NVV2S
R42PUY2S FDMG42NVV2S
R30PUY2S FDMG30PUV2S
R36PUY2S FDMG36PUV2S
R42PUY2S FDMG42PUV2S
R56NUY2S FDMG56PUV2S
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List of Applicable Models Si20-701_B
RR-M Series
Series Outdoor Units Indoor Units
RR71MV1 FAQ71BVV1B
RR71MV1 FBQ71DV1
RR-MV1
RR71MV1 FCQ71KVEA
RR71MV1 FHQ71BVV1B
RR71MY1 FAQ71BVV1B
RR100MY1 FAQ100BVV1B
RR71MY1 FBQ71DV1
RR100MY1 FBQ100DV1
RR125MY1 FBQ125DV1
RR140MY1 FBQ140DV1
RR-MY1 RR71MY1 FCQ71KVEA
RR100MY1 FCQ100KVEA
RR125MY1 FCQ125KVEA
RR140MY1 FCQ140KVEA
RR71MY1 FHQ71BVV1B
RR100MY1 FHQ100BVV1B
RR125MY1 FHQ125BVV1B
RY-FU Series
Series Outdoor Units Indoor Units
RY71FUVAL FAY71FVE
RY100FUVAL FAY100FVE
RY71FUVAL FHY71BVE
RY100FUVAL FHY100BVE
RY71FUVAL FHYB71FVAL
RY-FUVAL
RY100FUVAL FHYB100FVAL
RY71FUVAL FHYC71KVE
RY100FUVAL FHYC100KVE
RY71FUVAL FVY71LVE
RY100FUVAL FVY100LVE
RY125FUTAL FHY125BVE
RY125FUTAL FHYB125FVAL
RY-FUTAL
RY125FUTAL FHYC125KVE
RY125FUTAL FVY125LVE
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Si20-701_B List of Applicable Models
RY-FV Series
Series Outdoor Units Indoor Units
RY35FV1A FHY35BVE
RY35FV1A FHYB35FV1
RY-FV1A
RY35FV1A FHYC35KVE
RY35FV1A FHYK35FJV1
RY-G Series
Series Outdoor Units Indoor Units
RY50GVAL FHY50BVE
RY60GVAL FHY60BVE
RY-GVAL
RY50GVAL FHYC50KVE
RY60GVAL FHYC60KVE
RY50GV1A FHYB45FV1
RY60GV1A FHYB60FV1
RY50GV1A FHYC50KVE
RY-GV1A
RY60GV1A FHYC60KVE
RY50GV1A FHYK45FJV1
RY60GV1A FHYK60FJV1
RY-GAV Series
Series Outdoor Units Indoor Units
RY50GAV1A FHY50BVE
RY-GAV
RY60GAV1A FHY60BVE
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List of Applicable Models Si20-701_B
RY-KU Series
Series Outdoor Units Indoor Units
RY71KUV1 FAY71FAVE
RY100KUV1 FAY100FAVE
RY71KUV1 FHY71BVE
RY100KUV1 FHY100BVE
RY71KUV1 FHYB71FV1
RY100KUV1 FHYB100FV1
RY71KUV1 FHYC71KVE
RY-KUV1
RY100KUV1 FHYC100KVE
RY71KUV1 FHYK71FJV1
RY71KUY1 FHYK71FJV1
RY71KUV1 FUY71FJV1
RY100KUV1 FUY100FJV1
RY71KUV1 FVY71LVE
RY100KUV1 FVY100LVE
RY71KUY1 FAY71FAVE
RY100KUY1 FAY100FAVE
RY71KUY1 FHY71BVE
RY100KUY1 FHY100BVE
RY125KUY1 FHY125BVE
RY71KUY1 FHYB71FV1
RY100KUY1 FHYB100FV1
RY125KUY1 FHYB125FV1
RY71KUY1 FHYC71KVE
RY-KUY1
RY100KUY1 FHYC100KVE
RY125KUY1 FHYC125KVE
RY140KUY1 FHYC140KVE
RY71KUY1 FUY71FJV1
RY100KUY1 FUY100FJV1
RY125KUY1 FUY125FJV1
RY71KUY1 FVY71LVE
RY100KUY1 FVY100LVE
RY125KUY1 FVY125LVE
RY-KUTAL RY140KUTAL FHYC140KVE
RY-KUTALK RY140KUTALK FHYC140KVE
RY-KUYAL RY140KUYAL FHYC140KVE
RY-KUYALK RY140KUYALK FHYC140KVE
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Si20-701_B List of Applicable Models
RY-LU Series
Series Outdoor Units Indoor Units
RY71LUV1 FAY71FAVE
RY100LUV1 FAY100FAVE
RY71LUV1 FAY71LVE
RY71LUV1 FDYB71KAVE
RY71LUV1 FDYM03FAV1
RY100LUV1 FDYM04FAV1
RY71LUV1 FHY71BVE
RY100LUV1 FHY100BVE
RY-LUV1 RY71LUV1 FHYB71FV1
RY100LUV1 FHYB100FV1
RY71LUV1 FHYC71KVE
RY100LUV1 FHYC100KVE
RY71LUV1 FHYK71FJV1
RY71LUV1 FUY71FJV1
RY100LUV1 FUY100FJV1
RY71LUV1 FVY71LAVE
RY100LUV1 FVY100LAVE
RY71LUV1 FHY35BVE 2
RY-LUV1 RY100LUV1 FHY50BVE 2
(Twin) RY71LUV1 FHYC35KVE 2
RY100LUV1 FHYC50KVE 2
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List of Applicable Models Si20-701_B
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Si20-701_B List of Applicable Models
RZ-L Series
Series Outdoor Units Indoor Units
RZ71LV1 FAY71FAVE
RZ-LV1 RZ71LV1 FHYB71FV1
RZ71LV1 FHYC71KVE
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List of Applicable Models Si20-701_B
RZQ-B Series
Series Outdoor Units Indoor Units
RZQ-B7V3B RZQS100B7V3B FCQ35C7VEB 3
RZQ100B8W1B FAQ100BUV1B
RZQ100B8W1B FBQ100B7V3B
RZQ125B8W1B FBQ125B7V3B
RZQ100B8W1B FCQ100C7VEB
RZQ125B8W1B FCQ125C7VEB
RZQ100B8W1B FCQH100C7VEB
RZQ-B8W1B RZQ125B8W1B FCQH125C7VEB
RZQ140B8W1B FCQH140C7VEB
RZQ125B8W1B FDQ125B7V3B
RZQ100B8W1B FHQ100BUV1B
RZQ125B8W1B FHQ125BUV1B
RZQ100B8W1B FUQ100BUV1B
RZQ125B8W1B FUQ125BUV1B
RZQ140B8W1B FAQ71BUV1B 2
RZQ100B8W1B FBQ50B7V1 2
RZQ125B8W1B FBQ60B7V1 2
RZQ140B8W1B FBQ71B7V3B 2
RZQ100B8W1B FCQ50C7VEB 2
RZQ125B8W1B FCQ60C7VEB 2
RZQ-B8W1B RZQ140B8W1B FCQ71C7VEB 2
(Twin) RZQ140B8W1B FCQH71C7VEB 2
RZQ100B8W1B FFQ50BV1B 2
RZQ125B8W1B FFQ60BV1B 2
RZQ100B8W1B FHQ50BUV1B 2
RZQ125B8W1B FHQ60BUV1B 2
RZQ140B8W1B FHQ71BUV1B 2
RZQ140B8W1B FUQ71BUV1B 2
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Si20-701_B List of Applicable Models
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List of Applicable Models Si20-701_B
RZQ-C Series
Series Outdoor Units Indoor Units
RZQ71C7V1B FAQ71BUV1B
RZQ100C7V1B FAQ100BUV1B
RZQ71C7V1B FBQ71B7V3B
RZQ100C7V1B FBQ100B7V3B
RZQ125C7V1B FBQ125B7V3B
RZQ100C7V1B FCQ100C7VEB
RZQ125C7V1B FCQ125C7VEB
RZQ140C7V1B FCQ140C7VEB
RZQ71C7V1B FCQ71C7V3B
RZQ100C7V1B FCQ100C7V3B
RZQ125C7V1B FCQ125C7V3B
RZQ140C7V1B FCQ140C7V3B
RZQ100C7V1B FCQH100C7VEB
RZQ-C7V1B
RZQ125C7V1B FCQH125C7VEB
RZQ140C7V1B FCQH140C7VEB
RZQ71C7V1B FCQH71C7V3B
RZQ100C7V1B FCQH100C7V3B
RZQ125C7V1B FCQH125C7V3B
RZQ140C7V1B FCQH140C7V3B
RZQ125C7V1B FDQ125B7V3B
RZQ71C7V1B FHQ71BUV1B
RZQ100C7V1B FHQ100BUV1B
RZQ125C7V1B FHQ125BUV1B
RZQ71C7V1B FUQ71BUV1B
RZQ100C7V1B FUQ100BUV1B
RZQ125C7V1B FUQ125BUV1B
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Si20-701_B List of Applicable Models
20
List of Applicable Models Si20-701_B
21
Si20-701_B List of Applicable Models
RZQG-L Series
Series Outdoor Units Indoor Units
RZQG71LV1B FCQG71EVEB
RZQG100LV1B FCQG100EVEB
RZQG125LV1B FCQG125EVEB
RZQG140LV1B FCQG140EVEB
RZQG-LV1B
RZQG71LV1B FHQG71CVEB
RZQG100LV1B FHQG100CVEB
RZQG125LV1B FHQG125CVEB
RZQG140LV1B FHQG140CVEB
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List of Applicable Models Si20-701_B
RZQ-H Series
Series Outdoor Units Indoor Units
RZQ100HY4A FBQ100DV1
RZQ125HY4A FBQ125DV1
RZQ160HY4A FBQ140DV1
RZQ-HY RZQ100HY4A FCQ100KVEA
RZQ125HY4A FCQ125KVEA
RZQ100HY4A FHQ100BVV1B
RZQ125HY4A FHQ125BVV1B
RZQ-K Series
Series Outdoor Units Indoor Units
RZQ71KAVLT FBQ71DVET
RZQ100KAVLT FBQ100DVET
RZQ125KATLT FBQ125DVET
RZQ140KATLT FBQ140DVET
RZQ-KA
RZQ71KAVLT FCQ71KVLT
RZQ100KAVLT FCQ100KVLT
RZQ125KATLT FCQ125KVLT
RZQ140KATLT FCQ140KVLT
RZQ71KBV1 FAQ71BVV1B
RZQ100KBV1 FAQ100BVV1B
RZQ71KBV1 FBQ71DV1
RZQ71KBV1 FCQ71KVEA
RZQ-KB
RZQ100KBV1 FCQ100KVEA
RZQ160HY4A FCQ140KVEA
RZQ71KBV1 FHQ71BVV1B
RZQ100KBV1 FHQ100BVV1B
RZQ71KCVLT FBQ71DAVET
RZQ100KCVLT FBQ100DAVET
RZQ125KCTLT FBQ125DAVET
RZQ140KCTLT FBQ140DAVET
RZQ-KC
RZQ71KCVLT FCQ71KVLT
RZQ100KCVLT FCQ100KVLT
RZQ125KCTLT FCQ125KAVLT
RZQ140KCTLT FCQ140KAVLT
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Si20-701_B List of Applicable Models
RZQS-B Series
Series Outdoor Units Indoor Units
RZQS71B7V3B FAQ71BUV1B
RZQS100B7V3B FAQ100BUV1B
RZQS71B7V3B FBQ71B7V3B
RZQS100B7V3B FBQ100B7V3B
RZQS71B7V3B FCQ71C7VEB
RZQS100B7V3B FCQ100C7VEB
RZQS-B7V3B
RZQS71B7V3B FCQH71C7VEB
RZQS100B7V3B FCQH100C7VEB
RZQS71B7V3B FHQ71BUV1B
RZQS100B7V3B FHQ100BUV1B
RZQS71B7V3B FUQ71BUV1B
RZQS100B7V3B FUQ100BUV1B
RZQS71B7V3B FBQ35B7V1 2
RZQS100B7V3B FBQ50B7V1 2
RZQS71B7V3B FCQ35C7VEB 2
RZQS-B7V3B RZQS100B7V3B FCQ50C7VEB 2
(Twin) RZQS71B7V3B FFQ35BV1B 2
RZQS100B7V3B FFQ50BV1B 2
RZQS71B7V3B FHQ35BUV1B 2
RZQS100B7V3B FHQ50BUV1B 2
RZQS100B7V3B FFQ35BV1B 3
RZQS-B7V3B
RZQS100B7V3B FBQ35B7V1 3
(Triple)
RZQS100B7V3B FHQ35BUV1B 3
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List of Applicable Models Si20-701_B
RZQS-C Series
Series Outdoor Units Indoor Units
RZQS125C7V1B FBQ125B7V3B
RZQS125C7V1B FCQ125C7VEB
RZQS140C7V1B FCQ140C7VEB
RZQS125C7V1B FCQH125C7VEB
RZQS-C7V1B
RZQS140C7V1B FCQH140C7VEB
RZQS125C7V1B FDQ125B7V3B
RZQS125C7V1B FHQ125BUV1B
RZQS125C7V1B FUQ125BUV1B
RZQS140C7V1B FAQ71BUV1B 2
RZQS125C7V1B FBQ60B7V1 2
RZQS140C7V1B FBQ71B7V3B 2
RZQS125C7V1B FCQ60C7VEB 2
RZQS-C7V1B RZQS140C7V1B FCQ71C7VEB 2
(Twin) RZQS140C7V1B FCQH71C7VEB 2
RZQS125C7V1B FFQ60BV1B 2
RZQS125C7V1B FHQ60BUV1B 2
RZQS140C7V1B FHQ71BUV1B 2
RZQS140C7V1B FUQ71BUV1B 2
RZQS125C7V1B FBQ50B7V1 3
RZQS140C7V1B FBQ50B7V1 3
RZQS125C7V1B FCQ50C7VEB 3
RZQS-C7V1B RZQS140C7V1B FCQ50C7VEB 3
(Triple) RZQS125C7V1B FFQ50BV1B 3
RZQS140C7V1B FFQ50BV1B 3
RZQS125C7V1B FHQ50BUV1B 3
RZQS140C7V1B FHQ50BUV1B 3
RZQS125C7V1B FBQ35B7V1 4
RZQS140C7V1B FBQ35B7V1 4
RZQS125C7V1B FCQ35C7VEB 4
RZQS-C7V1B RZQS140C7V1B FCQ35C7VEB 4
(Double-twin) RZQS125C7V1B FFQ35BV1B 4
RZQS140C7V1B FFQ35BV1B 4
RZQS125C7V1B FHQ35BUV1B 4
RZQS140C7V1B FHQ35BUV1B 4
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Si20-701_B List of Applicable Models
RZR-HU Series
Series Outdoor Units Indoor Units
RZR100HUY1 FBQ100DV1
RZR125HUY1 FBQ125DV1
RZR140HUY1 FBQ140DV1
RZR100HUY1 FCQ100KVEA
RZR125HUY1 FCQ125KVEA
RZR-HUY1
RZR140HUY1 FCQ140KVEA
RZR100HUY1 FHQ100BV1B
RZR125HUY1 FHQ125BV1B
RZR100HUY1 FHQ100BVV1B
RZR125HUY1 FHQ125BVV1B
RZR30HUY2S FBQ30DV2S
RZR36HUY2S FBQ36DV2S
RZR42HUY2S FBQ42DV2S
RZR48HUY2S FBQ48DV2S
RZR-HUY2S
RZR30HUY2S FCQ30KV2S
RZR36HUY2S FCQ36KV2S
RZR42HUY2S FCQ42KV2S
RZR48HUY2S FCQ48KV2S
RZR-KU Series
Series Outdoor Units Indoor Units
RZR71KUV1 FBQ71DV1
RZR100KUV1 FBQ100DV1
RZR125KUV1 FBQ125DV1
RZR140KUV1 FBQ140DV1
RZR71KUV1 FCQ71KVEA
RZR100KUV1 FCQ100KVEA
RZR125KUV1 FCQ125KVEA
RZR-KUV1
RZR140KUV1 FCQ140KVEA
RZR71KUV1 FHQ71BV1B
RZR100KUV1 FHQ100BV1B
RZR125KUV1 FHQ125BV1B
RZR71KUV1 FHQ71BVV1B
RZR100KUV1 FHQ100BVV1B
RZR125KUV1 FHQ125BVV1B
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List of Applicable Models Si20-701_B
RZY-L Series
Series Outdoor Units Indoor Units
RZY71LV1 FAY71FAVE
RZY-LV1 RZY71LV1 FHYB71FV1
RZY71LV1 FHYC71KVE
RZY71LVAL FAY71FAVE
RZY-LVAL RZY71LVAL FHYB71FVAL
RZY71LVAL FHYC71KVE
RZY100LTAL FAY100FAVE
RZY100LTAL FHYB100FVAL
RZY125LTAL FHYB125FVAL
RZY-LTAL RZY100LTAL FHYC100KVE
RZY125LTAL FHYC125KVE
RZY100LTAL FVY100LVE
RZY125LTAL FVY125LVE
27
Si20-701_B List of Applicable Models
CMSQ Series
Series Outdoor Units Indoor Units
FMCQ50A7VEB
FMCQ60A7VEB
FMCQ71A7VEB
FMCQ100A7VEB
FMCQ125A7VEB
FMDQ50A7V3B
FMDQ60A7V3B
CMSQ-A7W1B CMSQ200A7W1B
FMDQ71A7V3B
(Multi) CMSQ250A7W1B
FMDQ100A7V3B
FMDQ125A7V3B
FMDQ50B7VEB
FMDQ60B7VEB
FMDQ71B7VEB
FMDQ100B7VEB
FMDQ125B7VEB
28
Symptom-based Troubleshooting Si20-701_B
2. Symptom-based
Troubleshooting
2.1 Overview
Symptom Details of Measures
1 Equipment does not operate. Refer to P.31
Indoor unit fan operates, but
2 Refer to P.33
compressor does not operate.
Cooling/heating operation starts
3 Refer to P.36
but stops immediately.
After unit shuts down, it cannot
4 Refer to P.38
be restarted for a while.
Equipment operates but does
5 Refer to P.41
not provide cooling.
Equipment operates but does
6 Refer to P.44
not provide heating.
Equipment discharges white
7 Refer to P.47
mist.
Equipment produces loud noise
8 Refer to P.49
or vibration.
9 Equipment discharges dust. Refer to P.52
Remote controller LCD displays
10 Refer to P.53
88.
Room smell and cigarette odors
accumulated inside the indoor
11 Equipment emits odor. unit are discharged with air.
Inside of the indoor unit must be
cleaned.
It is normal.
Flap operates when power is
12 The flap initializes for accurate
turned ON.
positioning.
It is normal.
Change of operation mode There is a control function that
13
causes flap to move. moves the flap when operation
mode is changed.
It is normal.
Fan operates in M tap during
It is caused by the activation of
14 heating even if remote controller
the overload control (airflow shift
is set to L tap.
control).
It is normal.
It is caused by the activation of
Flap automatically moves during
15 the dew condensation
cooling.
prevention function or ceiling
soiling prevention function.
29
Si20-701_B Symptom-based Troubleshooting
30
Symptom-based Troubleshooting Si20-701_B
Supposed Causes
Fuse blown or disorder of contact in operation circuit
Defective operation switch or contact point
Defective high pressure switch
Defective magnetic switch for fan motor
Activation or fault of overcurrent relay for fan motor
Defective overcurrent relay for compressor
Defective compressor protection thermostat
Insufficient insulation in electric system
Defective contact point of magnetic switch for
compressor
Defective compressor
Defective remote controller or low batteries (wireless)
Incorrect address setting of wireless remote controller
31
Si20-701_B Symptom-based Troubleshooting
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
power switch YES
OFF or fuse for power Turn ON the
switch blown? power switch or
replace the fuse.
If high-harmonics
NO circuit breaker is
not used on the
inverter
compressor,
replace the circuit
breaker.
Is there YES
power failure? Wait until power
returns.
NO
Is the
operation YES
switch pressed Normal. Start up
repeatedly? operation after 3
minutes (3-min.
standby).
NO
Is the
thermostat YES
changed and reset Normal. Start up
again? operation after 3
minutes (3-min.
NO standby).
Is the
operation YES
lamp on LCD remote Diagnose based
controller on error code on
blinking? remote controller.
NO
Is the
operation
lamp on indoor unit YES
Diagnose based
signal receiving part on error code on
blinking? remote controller.
NO
Defective electric
component Check the
electric system.
32
Symptom-based Troubleshooting Si20-701_B
Supposed Causes
Fuse blown or disorder of contact in operation circuit
Defective thermistor
Defective indoor/outdoor unit PCB
Defective magnetic switch
Defective power transistor
Defective compressor
33
Si20-701_B Symptom-based Troubleshooting
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
power switch YES
OFF or the fuse for Turn ON the
power switch power switch or
blown? replace the fuse.
NO
Is the
heating switch YES
turned ON at outdoor Normal.
air temperature > (Thermostat OFF
32C by outdoor air
temperature)
NO
(1)
Is rated
voltage applied at YES
Replace the
the compressor compressor.
terminals?
NO
(2)
Is rated
voltage output YES
from the magnetic Replace the
switch or power magnetic switch
transistor? or power
transistor.
NO
(3)
Is rated YES
voltage output from Replace the
the PCB? PCB.
NO
Check the
thermistor.
34
Magnetic
Suction air switch or
thermistor Outdoor unit PCB power
Indoor unit PCB transistor
Relay COMP.
Symptom-based Troubleshooting
e d c
Input Output Input Output from Output from Output from
from relay or micro- magnetic Compressor
to to
computer switch or SW
PCB PCB PCB circuit of
power
transistor
35
Si20-701_B
Si20-701_B Symptom-based Troubleshooting
Supposed Causes
Refrigerant overcharge
Air mixed in refrigerant system
Defective pressure switch
Defective magnetic switch for outdoor unit fan motor
Defective aux. relay for outdoor unit fan motor
Soiled heat exchanger of outdoor unit
There is an interfering item in airflow of outdoor unit
Defective outdoor unit fan
Soiled air filter of indoor unit
Soiled heat exchanger of indoor unit
There is some interfering item in airflow of indoor unit
Defective indoor unit fan
36
Symptom-based Troubleshooting Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
type of remote wired
controller wired or
wireless?
Is the
Wireless operation lamp of YES
remote controller Diagnose based
blinking? on the error code
Is the on remote
operation lamp YES NO controller
of indoor unit receiver
blinking?
NO
Heating:
Indoor unit
Cooling:
Outdoor unit
Is there YES
any interfering item Remove the
in airflow? interfering item.
NO
37
Si20-701_B Symptom-based Troubleshooting
Supposed Causes
Overcurrent relay (for compressor)
Overcurrent relay may act due to the following
reasons
Lower voltage of power supply
Excess level of high pressure
Insufficient size of power cable
Defective compressor
Compressor protection thermostat
Compressor protection thermostat may act due to the
following reasons
Internal leakage of four way valve (There is no
difference between suction air temperature and
discharge pipe temperature)
Insufficient compression of compressor
Incorrect refrigerant
Defective electronic expansion valve
Insufficient circulation of refrigerant
38
Symptom-based Troubleshooting Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Does
the unit start YES
operation after 3 Normal. Unit is in
minutes? 3-min. standby
mode.
NO
Is the
discharge side NO Not so hot
of compressor hot after Check the
the unit stops? compressor.
YES
Check on the cause why
overcurrent relay (for
compressor) or
compressor protection
thermostat acted.
[Electric system]
Power
supply voltage NO
is within 10 % of Contact the
specified power company.
voltage.
YES
Is the
size of power NO
cable through total Replace the
length correct? power cable.
YES
[Refrigerant circuit]
After vacuum drying,
charge correct amount of
refrigerant. Then, start
operation again.
39
Si20-701_B Symptom-based Troubleshooting
Is
there any
temperature
difference between NO
inlet and outlet of Replace the
electronic electronic
expansion expansion valve.
valve?
YES
Is
there any
temperature
difference between NO
suction side and Replace the four
discharge side of way valve.
four way
valve?
YES
Defective compressor Check the
compressor.
40
Symptom-based Troubleshooting Si20-701_B
Supposed Causes
Wrong selection of model
Refrigerant shortage
Insufficient airflow in the indoor unit
Increase of high pressure
In addition, the following errors may be conceivable
Insufficient compression of the compressor
Insufficient circulation of refrigerant
Defective electronic expansion valve
41
Si20-701_B Symptom-based Troubleshooting
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Temperature
difference for cooling YES
should be between
8 and 18C.
Does
the heat load
NO increase after YES
Normal.
installation of the
unit?
NO
Wrong selection of
model Additional unit
Does Affection of direct sun installation
any frost should be
generate considered.
around inlet port of YES
indoor unit heat
exchanger or outlet
port of electronic
expansion Is the
valve? operation YES
current less than Refrigerant
specified level? shortage possibly
generates
NO trouble.
NO After vacuum
drying, charge
correct amount of
refrigerant.
Does indoor YES
unit airflow rate Check the each
decrease? section.
Clogged air
NO filter
Soiled heat
A exchanger
Defective fan
motor
(Refer to
troubleshooting
A6.)
42
Symptom-based Troubleshooting Si20-701_B
43
Si20-701_B Symptom-based Troubleshooting
Supposed Causes
Wrong selection of model
Refrigerant shortage
Insufficient airflow in the indoor unit
Decrease of low pressure
In addition, the following errors may be conceivable
Insufficient compression of the compressor
Insufficient circulation of refrigerant
Defective electronic expansion valve
44
Symptom-based Troubleshooting Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Temperature
difference for heating YES
should be between
14 and 30C.
Does the
NO heat load increase YES
after installation of the Normal
unit?
NO
Wrong selection of
model
Affection of excessive Additional unit
fresh air into room installation
should be
Is the considered.
operation YES
current less than Refrigerant
specified level? shortage possibly
generates
trouble.
NO After vacuum
drying, charge
correct amount of
Does refrigerant.
indoor unit airflow YES
Check the each
rate decrease? item.
Clogged air
filter
NO Soiled heat
exchanger
A Defective
indoor unit fan
motor
(Refer to
troubleshooting
A6)
45
Si20-701_B Symptom-based Troubleshooting
46
Symptom-based Troubleshooting Si20-701_B
Supposed Causes
Humid installation site
Installation site is dirty and with dense oil mists
Soiled heat exchanger
Clogged air filter
Defective fan motor
47
Si20-701_B Symptom-based Troubleshooting
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the room
temperature higher YES
than set value in
cooling?
NO Continue
the unit operation. NO
Is white mist coming Normal
out from the
unit?
YES
Remove the
source of humid
Is the condition.
heat exchanger YES
of indoor unit soiled? Cleaning of heat
exchanger is
necessary.
NO
Is the
site dusty or YES
with dense oil mist? Remove the
source of oil mist
or dust.
NO
Is the YES
airflow rate too Cleaning of air
small? filter
Check the fan
NO motor.
(Refer to
troubleshooting
Did the trouble generate A6)
on switching to heating
mode after complete of Normal
defrosting in heating? (Mist is
generated due to
defrosting
operation)
48
Symptom-based Troubleshooting Si20-701_B
Supposed Causes
Improper installation
Contacts of fan, piping, casing, etc.
Noise of refrigerant flow
Operating noise of drain discharge equipment
Noise of resin components contracting
In addition, the following errors may be conceivable
Refrigerant overcharge
Air interfusion
Flash noise of insufficient refrigerant (hushing
noise)
49
Si20-701_B Symptom-based Troubleshooting
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Does
the noise [Installation work side]
generate with YES
vibration of whole Correction of
ceilings and installation.
walls? Reinforcement
for ceilings or
walls
NO
Does
the noise YES
generate with vibration Insert shock
of unit mounting absorber in
section? mounting
section, or
NO strengthen the
mounting
section.
Is the NO
piping secured? Insert cushion
materials to the
pipe support
YES such as saddle.
[Power supply side]
Does
the fan contact YES
Disassemble and
with other parts? remove parts
contact.
NO
Is the
noise flushing
sound from pressure YES
Normal.
reducing valve or
capillary
tube?
NO
50
Symptom-based Troubleshooting Si20-701_B
Continuous
slight noise of YES
"shoo..." during cooling Normal.
or defrosting The sound is
flushing noise of
refrigerant inside
air conditioning
NO unit.
Sound
of "shoo..."
generates just YES
after operation start or Normal.
stop, or defrosting The noise is a
start or stop. sound generated
at the time of
refrigerant flow
NO change or stop.
Sound
of "shoo..."
generates during YES
Normal.
cooling or after Operation sound
operation of draining
stop. device
NO
Creak
during heating YES
and after operation Normal.
stop Creak generates
by shrinkage of
resin parts due to
NO temperature
change.
Is this
an impact YES
noise at the start/end It is normal.
of defrosting?
An impact noise can
be reduced by means
NO of "Defrost Noise
Reduction Setting."
Refrigerant overcharge
Air mixed in refrigerant
system
Flushing noise due to After vacuum
refrigerant shortage. drying, charge
(Sound of shoo...) correct amount of
refrigerant.
51
Si20-701_B Symptom-based Troubleshooting
Supposed Causes
Carpet
Animal hair
Application (cloth shop,...)
Troubleshooting
Be sure to turn off power switch before connect or
disconnect connector, or parts damage may be
Caution occurred.
Does
the trouble
generate at the
time of operation start YES
Dust collected
again after extended inside the indoor
period of unit are blown
operation? out.
Cleaning for
inside of indoor
NO unit is necessary.
52
Symptom-based Troubleshooting Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Trouble
generates just after YES
The unit is
power supply checking to
ON. confirm that
remote controller
NO is normal.
Indication
appears for short
Is the time.
position of SS1 YES
on indoor unit PCB at Turn the switch
"Emergency"? to "Normal", and
reset power
supply.
NO
53
Si20-701_B Troubleshooting by Remote Controller
3. Troubleshooting by Remote
Controller
3.1 Procedure of Self-diagnosis
by Remote Controller
3.1.1 Wired Remote Controller
BRC1C61/BRC1D61
If operation stops due to error, the remote controllers
operation LED blinks, and error code is displayed. (Even
if stop operation is carried out, error contents are
displayed when the inspection mode is entered.) The
error code enables you to tell what kind of error caused
operation to stop.
Operation LED
ON/OFF button
Display of
indoor unit for
which an error
has been
detected
Inspection
display Error code
INSPECTION/
TEST button
Note:
1. Pressing the INSPECTION/TEST button will blink the
check indication.
2. While in service mode, holding down the ON/OFF
button for a period of 5 seconds or more will clear the
error history indication shown above. In this case, on
the codes display, the error code will blink twice and
then change to 00 (= Normal), the Unit No. will
change to 0, and the operation mode will
automatically switch from service mode to normal
mode (displaying the set temperature).
54
Troubleshooting by Remote Controller Si20-701_B
Operation lamp
55
Si20-701_B Troubleshooting by Remote Controller
Applicable
model names
56
Troubleshooting by Remote Controller Si20-701_B
57
Si20-701_B Troubleshooting by Remote Controller
Normal status
Enters inspection mode
from normal status when
the INSPECTION/TEST
button is pressed.
2
If no button is
pressed for 1
minute,
equipment
returns to normal
status.
When MODE
selector button is
pressed or no 3
button is pressed Press
for 1 minute, MODE
equipment If no button is selector
returns to normal pressed for 1 button.
status. minute,
6 equipment 4
returns to normal
status.
58
Troubleshooting by Remote Controller Si20-701_B
Reference Page
Error
FUY, FHC, FH
Contents of Error
Code
FH(Y)C
FH(Y)K
FH(Y)B
FH(Y)
FV(Y)
FA(Y)
Indoor Unit PCB
A1 h h h h h h h 81
Abnormality
Drain Water Level h
A3 h h h h h h 83
System Abnormality 1
Indoor Unit Fan Motor h
A6 h h 86
Abnormality 1
Swing Flap Motor
A7 h h h h h h 98
Abnormality/Lock
Drain System h
AF h h h h h h 105
Abnormality 1
Capacity Setting h
AJ h h h h h h 108
Abnormality 1
Thermistor h
C4 h h h h h h 121
Abnormality 1
Thermistor h
C9 h h h h h h 121
Abnormality 1
Remote Controller h
CJ h h h h 128
Thermistor Abnormality 2
59
Si20-701_B Troubleshooting by Remote Controller
Model Name
Reference Page
FUQ, FFQ, FVQ
FHQ(G), FAQ
Error
Contents of Error
FCQ(H)(G)
Code
FMCQ
FMDQ
FDQ
FBQ
Error of External h
A0 h 79
Protection Device 3
Indoor Unit PCB
A1 h h h h h h h 81
Abnormality
Drain Water Level h
A3 h h h h h h 83
System Abnormality 2, 6
Indoor Unit Fan Motor h
86
Abnormality 1
Drain Water Level h h
88
System Abnormality 3 1
Indoor Unit Fan Motor
A6 h 90
Abnormality
Indoor Unit Fan Motor
h 94
Abnormality
Fan Motor (M1F)
h h 96
Lock, Overload
Swing Flap Motor h h
A7 h h h 98
Abnormality/Lock 3, 4 1
Abnormal Power h
A8 h h 100
Supply Voltage 3
Electronic Expansion
A9 Valve Coil (Y1E) h h 102
Abnormality
Drain System h h h
h h 105
Abnormality 3, 4 1 2, 6
AF
Drain Level above
h h 107
Limit
60
Troubleshooting by Remote Controller Si20-701_B
Model Name
Reference Page
FUQ, FFQ, FVQ
FHQ(G), FAQ
Error
Contents of Error
FCQ(H)(G)
Code
FMCQ
FMDQ
FDQ
FBQ
Capacity Setting h h
h h 110
Abnormality 3, 4 1
Capacity Setting h h h
AJ h h h 112
Abnormality 3 1 2, 6
Capacity Setting
h h 113
Abnormality
Transmission Error
(between Indoor Unit h h 115
PCB and Fan PCB)
C1 Transmission Error
(between Indoor Unit h
118
PCB and Adaptor 5
PCB)
Thermistor
C4 h h h h h h h 121
Abnormality
Thermistor h
C5 121
Abnormality 4
Defective
Combination
C6 h h 123
(between Indoor Unit
PCB and Fan PCB)
Thermistor
C9 h h h h h h h 121
Abnormality
Humidity Sensor h
125
System Abnormality 3, 4
CC
Humidity Sensor h
h 126
System Abnormality 3, 5
Remote Controller
CJ Thermistor h h h h h h h 128
Abnormality
61
Si20-701_B Troubleshooting by Remote Controller
Reference Page
R(Y)-G/GA
Error
Contents of Error
R-NU/PU
R(Y)-KU
R(Y)-FU
R(Y)-LU
Code
RR-M
RY-F
Actuation of Safety
h h h h 130
Device
Actuation of Safety
E0 h 132
Device
Actuation of Safety
h h 135
Device
Defective Outdoor Unit
E1 h h 140
PCB
High Pressure System
h h h 143
Abnormality
E3
High Pressure System
h h 145
Abnormality
Low Pressure System
E4 h h h h h 162
Abnormality
E6 Compressor Overcurrent h h 181
Electronic Expansion
E9 h h h h 196
Valve Abnormality
Discharge Pipe
h h h 210
Temperature Abnormality
F3
Discharge Pipe
h h 212
Temperature Abnormality
Abnormal Heat
F6 h 220
Exchanging Temperature
High Pressure Switch
h h h 224
Abnormality
H3
High Pressure Switch
h 226
Abnormality
Outdoor Air Thermistor
H9 h h h h h h 239
System Abnormality
Current Sensor System
J2 h h 243
Abnormality
Discharge Pipe
J3 Thermistor System h h h h h h 245
Abnormality
Heat Exchanger
J6 Thermistor System h h h h h h 250
Abnormality
62
Troubleshooting by Remote Controller Si20-701_B
Series Name
Reference Page
R(Y)-G/GA
Error
Contents of Error
R-NU/PU
R(Y)-KU
R(Y)-FU
R(Y)-LU
Code
RR-M
RY-F
Defective Capacity
PJ h h 336
Setting
U0 Refrigerant Shortage h h h h h 347
Reverse Phase h h h 358
U1
Reverse Phase h h 359
Transmission Error
(Between Indoor Unit and h 375
Outdoor Unit)
U4
Transmission Error
(Between Indoor Unit and h h h h h h 378
Outdoor Unit)
Transmission Error
U5 (Between Indoor Unit and h h h h h h h 404
Remote Controller)
Transmission Error
Between
U8 Main Remote Controller h h h h 415
and Sub Remote
Controller
Defective Field Setting
UA h h h h 424
Switch
Transmission Error
(Between Indoor Unit and h h h h h h 444
UF Outdoor Unit)
Mis-connection of Field
h 447
Wiring
63
Si20-701_B Troubleshooting by Remote Controller
Inverter Series
Model Name
Reference Page
RZR-KU/HU
RZQ(S)-B/C
Error
Contents of Error
RZQ-K/H
RZQG-L
Code
CMSQ
RZ(Y)
Activation of Outdoor Unit
E0 h 138
Protection Device
Outdoor Unit PCB
h 141
Abnormality
E1
Outdoor Unit PCB
h h h h 142
Abnormality
Abnormally High
h 148
Pressure Level (HPS)
High Pressure
Abnormality (Detected by
h h h 150
the High Pressure
Switch)
E3
Actuation of High
h 153
Pressure Switch
Actuation of High
h 156
Pressure Switch
Actuation of High
h 159
Pressure Switch
Actuation of Pressure h h
h h 164
Sensor 1 4
Actuation of Low
h 168
Pressure Sensor
E4
Actuation of Pressure h h
171
Sensor 2 5
Low Pressure System h
173
Abnormality 6
Compressor Motor Lock h h h 176
E5
Compressor Motor Lock h 178
Outdoor Unit Fan Motor
h h h h 184
Abnormality
Outdoor Unit Fan Motor h
E7 187
Abnormality 6
Outdoor Unit Fan Motor
h 191
Abnormality
64
Troubleshooting by Remote Controller Si20-701_B
Model Name
Reference Page
RZR-KU/HU
RZQ(S)-B/C
Error
Contents of Error
RZQ-K/H
RZQG-L
Code
CMSQ
RZ(Y)
Electronic Expansion h
h 198
Valve Abnormality 6
Electronic Expansion
h 200
Valve Coil Abnormality
E9
Electronic Expansion h h
h h 203
Valve Abnormality 1 5
Electronic Expansion h h
207
Valve Abnormality 2 4
Discharge Pipe
h 214
Temperature Abnormality
Discharge Pipe
F3 h 216
Temperature Abnormality
Discharge Pipe
h h h h 218
Temperature Control
F6 Refrigerant Overcharged h 222
High Pressure Switch
h 228
Abnormality
H3
High Pressure Switch
h h h h 229
Abnormality
Low Pressure Switch h
231
System Abnormality 2
H4
Low Pressure Switch h
233
System Abnormality 5
Outdoor Unit Fan Motor h
H7 h 235
Signal Abnormality 6
Thermistor System
h h h 237
Abnormality
H9
Outdoor Air Thermistor
h h 240
System Abnormality
Pressure Sensor h h
J1 h 241
Abnormality 1 4
65
Si20-701_B Troubleshooting by Remote Controller
Model Name
Reference Page
RZR-KU/HU
RZQ(S)-B/C
Error
Contents of Error
RZQ-K/H
RZQG-L
Code
CMSQ
RZ(Y)
Discharge Pipe
Thermistor System h h 246
Abnormality
J3
Discharge Pipe
Thermistor System h h h 237
Abnormality
Thermistor System
h h h 237
Abnormality
J5
Thermistor System
h 248
Abnormality
Heat Exchanger
Thermistor System h h 251
J6 Abnormality
Thermistor System
h h h 237
Abnormality
Thermistor System
h h h 237
Abnormality
J7
Liquid Pipe Thermistor
h 252
Abnormality
Thermistor System
J8 h h h 237
Abnormality
Subcooling Heat
J9 Exchanger Gas Pipe h 254
Thermistor Abnormality
High Pressure Sensor h
JA h 256
Abnormality 6
Suction Pipe Pressure h
JC h 259
Sensor Abnormality 5, 6
Outdoor Unit PCB h
h h 261
Abnormality 4
Outdoor Inverter PCB h
L1 263
Abnormality 6
Outdoor Unit PCB
h 265
Abnormality
66
Troubleshooting by Remote Controller Si20-701_B
Model Name
Reference Page
RZR-KU/HU
RZQ(S)-B/C
Error
Contents of Error
RZQ-K/H
RZQG-L
Code
CMSQ
RZ(Y)
Overcurrent of DC Output
h 268
(Instantaneous)
Radiation Fin
h h h h 270
Temperature Rise
L4
Radiation Fin
h 273
Temperature Rise
Radiation Fin h
276
Temperature Rise 6
Overcurrent of DC Output
h 278
(Instantaneous)
Momentary Overcurrent h
281
of Inverter Compressor 6
Output Overcurrent
L5 h 284
Detection
Inverter Compressor
h 287
Abnormality
Output Overcurrent
h h 290
Detection
Electronic Thermal
(L8) h 294
Switch (Time Lag)
Inverter Current
h 297
Abnormality
Inverter Compressor h
300
Overcurrent 6
L8
Electronic Thermal (Time
h 303
Lag)
Electronic Thermal (Time
h h h 306
Lag)
Stall Prevention (Time
h 309
Lag)
h
L9 Inverter Startup Error h 311
6
Stall Prevention (Time h
h h h 314
Lag) 4, 5
67
Si20-701_B Troubleshooting by Remote Controller
Model Name
Reference Page
RZR-KU/HU
RZQ(S)-B/C
Error
Contents of Error
RZQ-K/H
RZQG-L
Code
CMSQ
RZ(Y)
Transmission Error
h
(between Control PCB h 317
6
and Inverter PCB)
Transmission Error
LC (between Control PCB h 321
and Inverter PCB)
Transmission Error
h
(between Control PCB h h 323
4, 5
and Inverter PCB)
Inverter Over-Ripple h
h 326
Protection 6
P1 Transmission Error
h
(between Control PCB h h h 329
4, 5
and Inverter PCB)
Radiation Fin Thermistor
h 331
Abnormality
Radiation Fin Thermistor
P4 h 333
Abnormality
Radiation Fin Thermistor
h h h 335
or Related Abnormality
Error in Capacity Setting h 338
Field Setting Error after
Replacing Main PCB or
h 339
Defective Combination of
PCB
PJ Defective Combination of h
341
Inverter and Fan Driver 6
Defective Capacity
h 343
Setting
Defective Capacity h
h h 345
Setting 4, 5
68
Troubleshooting by Remote Controller Si20-701_B
Model Name
Reference Page
RZR-KU/HU
RZQ(S)-B/C
Error
Contents of Error
RZQ-K/H
RZQG-L
Code
CMSQ
RZ(Y)
Refrigerant Shortage h 348
Low Pressure Drop Due
to Refrigerant Shortage
h 349
or Electronic Expansion
Valve Failure
U0 h
Refrigerant Shortage h 352
5
h
Refrigerant Shortage 354
4
h
Refrigerant Shortage h 356
3
h
Reverse Phase 359
U1 6
Reverse Phase h 360
Insufficient Voltage h 361
Power Supply Voltage
h h h 363
Abnormality
U2 Power Supply Insufficient h
h 365
or Instantaneous Failure 6
Power Supply Voltage
h 370
Abnormality
Check Operation is not
U3 h 373
Executed
69
Si20-701_B Troubleshooting by Remote Controller
Model Name
Reference Page
RZR-KU/HU
RZQ(S)-B/C
Error
Contents of Error
RZQ-K/H
RZQG-L
Code
CMSQ
RZ(Y)
Transmission Error
(Between Indoor Unit and h 381
Outdoor Unit)
Transmission Error
(Between Indoor Unit and h h 384
Outdoor Unit)
Transmission Error
(Between Indoor Unit and h 388
Outdoor Unit)
U4
Transmission Error
h
(Between Indoor Unit and 391
4, 5
Outdoor Unit)
Transmission Error
h
(Between Indoor Unit and 396
6
Outdoor Unit)
Transmission Error
(Between Indoor Unit and h 400
Outdoor Unit)
Transmission Error
(Between Indoor Unit and h 406
Remote Controller)
Transmission Error
h
U5 (Between Indoor Unit and h h 408
4, 5
Remote Controller)
Transmission Error
h
(Between Indoor Unit and h h 410
6
Remote Controller)
Transmission Error
U7 h 412
Between Outdoor Units
70
Troubleshooting by Remote Controller Si20-701_B
Model Name
Reference Page
RZR-KU/HU
RZQ(S)-B/C
Error
Contents of Error
RZQ-K/H
RZQG-L
Code
CMSQ
RZ(Y)
Transmission Error
(Between Main Remote
h 415
Controller and Sub
Remote Controller)
Transmission Error
(Between Main Remote
U8 h 417
Controller and Sub
Remote Controller)
Transmission Error
(Between Main Remote
h h h h 419
Controller and Sub
Remote Controller)
Transmission Error
(Between Indoor and h
U9 h 421
Outdoor Units in the 6
Same System)
Improper Combination of
Indoor and Outdoor
h 427
Units, Indoor Units and
Remote Controller
UA Field Setting Switch
h h h 430
Abnormality
Field Setting Switch and
h
Transmission Line h 433
6
Abnormality
Centralized Address
h h h h 437
Setting Error
UC
Address Duplication of
h 438
Centralized Controller
71
Si20-701_B Troubleshooting by Remote Controller
Model Name
Reference Page
RZR-KU/HU
RZQ(S)-B/C
Error
Contents of Error
RZQ-K/H
RZQG-L
Code
CMSQ
RZ(Y)
Transmission Error
between Centralized
h 439
Controller and Indoor
Unit
UE
Transmission Error
between Centralized h
h 444
Controller and Indoor 6
Unit
System is not Set yet h 448
Transmission Error
(Between Indoor and
Outdoor Unit) / Piping h h h 450
and Wiring Mismatch /
Refrigerant Shortage
UF h
System is not Set yet 453
4, 5
h
System is not Set yet 455
6
Transmission Error
(Between Indoor Unit and h 391
Outdoor Unit)
System Error, Refrigerant
UH System Address h 456
Undefined
72
Troubleshooting by Remote Controller Si20-701_B
73
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Error code
Description of error Description of diagnosis
AH - 07 Damper rotation error [when The damper does not rotate
the self-cleaning decoration normally. Check for any
panel is mounted] foreign matters around the
damper and for the operation
of the gear and limit switch.
AH - 08 Filter self-cleaning operation The unit has not yet
error [when the self-cleaning completed the filter self-
decoration panel is mounted] cleaning operation even after
the lapse of specified period
of time. Check for any
external noise, etc.
C6 - 01 Faulty combination of indoor A combination of indoor unit
unit PCB and fan PCB PCB and fan PCB is
defective. Check whether the
capacity setting adaptor is
correct and the type of the fan
PCB is correct.
74
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Error code
Description of error Description of diagnosis
L8 - 01 Electronic thermal 1 error Overload current continues
for a period of 260 seconds or
more.
This error is supposed to
have resulted from excessive
charging of refrigerant,
damage caused to the
compressor bearing, too high
pressure, etc.. Check and
probe the cause.
L8 - 02 Electronic thermal 2 error Overload current close to the
locked current flowed in the
thermal for a period of 5
seconds. This error is
supposed to have resulted
from closed stop valve,
disconnected wire in the
compressor motor, etc.
Check and probe the cause.
L8 - 03 Drop in compressor Compressor load has been
revolutions increased after startup. This
error is supposed to have
resulted from instantaneous
power failure, liquid back, etc.
Check and probe the cause.
L8 - 04 Thunder detection error Surges caused by thunder
L8 - 05 Inverter limiting current Excessive limiting current is
flowing in the inverter. This
error is supposed to have
resulted from failure to open
the stop valve, excessive
charging of refrigerant,
clogging in the indoor unit
filter stain in the indoor/
outdoor unit heat exchanger
etc.. Check and probe the
cause.
L9 - 01 Stall prevention (current Overload current has been
increase) applied to start up the
compressor.
This error is supposed to
have resulted from high
startup differential pressure,
liquid back, excessive
compressor oil, abnormal
compressor coil, seizure of
the compressor shaft, etc.
Check and probe the cause.
75
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Error code
Description of error Description of diagnosis
L9 - 02 Stall prevention (startup error) The compressor has not
completed startup operation.
This error is supposed to
have resulted from high
startup differential pressure,
liquid back, excessive
compressor oil, abnormal
compressor coil, seizure of
the compressor shaft,
defective position detection
circuit, etc.. Check and probe
the cause.
LC - 01 Defective wiring Defective transmission
including that caused when
the power supply turns ON.
This error is supposed to
have resulted from
Defective wire connections
around the PCB, defective
outdoor unit PCB, or
defective fan motor. Check
and probe the cause.
LC - 02 Transmission error between There is an error in
compressor and micro transmission between the
controller compressor and the outdoor
unit PCB. If the wire
connections of the
compressor are normal,
check for the same of the
outdoor unit PCB.
PJ - 01 Capacity setting not made This is an outdoor unit PCB
for repair, but has no capacity
setting adaptor connected.
Connect a correct capacity
setting adaptor to the PCB.
PJ - 04 Defective capacity setting This error results from a
mismatch of signals between
the controller in the PCB and
the inverter. Check whether
the type of the PCB is correct
and correct capacity setting
adaptor is connected.
U0 - 02 Refrigerant shortage - This error results from a
Outdoor unit (Factor 0) refrigerant shortage. Refer to
the U0 Troubleshooting flow
chart and make a diagnosis,
and then take
countermeasures.
76
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Error code
Description of error Description of diagnosis
U0 - 03 Refrigerant shortage - This error results from a
Outdoor unit (Factor 1) refrigerant shortage cause by
gas leakage. Charge
refrigerant up to the normal
refrigerant amount.
U0 - 04 Refrigerant shortage - This error results from
Outdoor unit (Factor 2) clogging caused somewhere
in the refrigerant piping
system. Check for a failure to
open the stop valve and
clogging in the refrigerant
system.
U2 - 01 Power supply voltage error This error is supposed to
have resulted from under- or
overvoltage of the power
supply, or defective voltage
sensor in the PCB.
U2 - 02 Open phase of power supply Check for any open phase of
the power supply.
U2 - 03 Main circuit capacitor charge There is abnormal circuit
error current flowing in the PCB. If
wire connections related to
the PCB are normal, replace
the outdoor unit PCB.
U2 - 04 SP/MP - PAM overvoltage There is overvoltage between
error SP/MP and PAM (Single
phase). If wire connections
related to the PCB are
normal, replace the outdoor
unit PCB.
UA - 01 Incorrect number of indoor This error will be displayed if
units connected the locally-set number of
indoor units is different from
the detected number of
indoor unit.
UA - 02 Multiple master units There are a number of indoor
detected units with a remote controller
connected.
Connect the remote controller
to only one indoor unit.
UA - 03 Excess indoor units This error will be displayed if
connected 5 or more indoor units are
connected.
77
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Error code
Description of error Description of diagnosis
UA - 05 Indoor-Outdoor transmission There is an error in
error between slave 1 and transmission between the
outdoor unit outdoor unit and slave indoor
unit 1. Check for the
connection of the jumper
between the slave indoor unit
(with no remote controller
connected) and the outdoor
unit.
UA - 07 Indoor-Outdoor transmission There is an error in
error between slave 2 and transmission between the
outdoor unit outdoor unit and slave indoor
unit 2. Check for the
connection of the jumper
between the slave indoor unit
(with no remote controller
connected) and the outdoor
unit.
UA - 09 Indoor-Outdoor transmission There is an error in
error between slave 3 and transmission between the
outdoor unit outdoor unit and slave indoor
unit 3. Check for the
connection of the jumper
between the slave indoor unit
(with no remote controller
connected) and the outdoor
unit.
UF - 01 Incorrect wiring There is an error in wire
connections for transmission
between indoor and outdoor
units (judged with the indoor
unit). Check for the
connections of jumpers 1, 2,
and 3 between the indoor and
outdoor units.
UF - 02 Piping connected the other There is an error in operation
way round mode and refrigerant piping
detection temperature. Check
for any refrigerant piping
connected the other way
round, refrigerant shortage,
etc.
78
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Actuation of external protection device
Improper field setting
Defective indoor unit PCB
79
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
External
protection
device is connected YES
to terminals T1 and T2 Actuation of
of the indoor unit external
terminal protection device.
block.
NO
External
ON/OFF
input (mode No.
12, first code No.
1) has been set to YES
external protection Change the
device input (second second code No.
code No. 03) by to "01" or "02" .
remote
controller.
NO
Replace the
indoor unit PCB.
80
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective indoor unit PCB
External factor (Noise, etc.)
81
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
NO
Normal reset? Replace the
indoor unit PCB.
YES
The error may be
caused by an
external factor,
rather than
damaged parts.
Locate the cause
and correct the
situation.
82
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective drain pump
Improper drain piping work
Drain piping clogging
Defective float switch
Defective indoor unit PCB
Defective short circuit connector
83
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
the unit a NO
cassette, corner or
built-in type?
YES
YES Is the
optional drain pump
installed?
Is a
drain pump NO NO
connected to the Connect the
indoor unit drain pump.
PCB?
Is the
YES short circuit
connector connected NO
Connect the
on the indoor unit short circuit
PCB? connector.
YES
Check the
continuity of the NO
short circuit connector. Replace the
Is there short circuit
continuity? connector.
Does YES
the drain pump NO Replace the
work after restarting indoor unit PCB.
operation?
YES Set to
"emergency"
and check the
voltage of the drain NO
Replace the
pump connector. 220- indoor unit PCB.
240 VAC?
YES
Replace the
Is the drain pump.
drain water YES
level abnormally Defective drain
high? system
NO
A
84
Troubleshooting by Remote Controller Si20-701_B
Is the float NO
switch connected ? Connect the float
switch.
YES
Remove the float switch,
short circuit, and restart
operation.
Error NO
displayed again? Replace the float
switch.
YES
Replace the
indoor unit PCB.
Note:
If "A3" is detected by a PCB without X15A, the PCB is
defective.
85
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective indoor unit fan motor
Broken or disconnected wire
Defective contact
Defective indoor unit PCB
86
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are
fan motor NO
connectors properly Connect
connected? correctly.
YES
With
connectors
unplugged and
the power supply
turned ON, is there NO
about 12 VDC between Replace the
pins 1 and 3 of fan indoor unit PCB.
motor
connectors.
YES
Check the indoor
unit fan motor
and motor wiring.
87
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective indoor unit fan motor
Breaking or disconnection of wire
Defective contact
Defective indoor unit PCB
For FCQ-C7, FAQ-BU
Disconnection, short circuit or disengagement of
connector in fan motor harness
Defective fan motor (disconnection, poor insulation)
Abnormal signal from fan motor (defective circuit)
Defective Indoor unit PCB
Instantaneous fluctuation of power supply voltage
Fan motor lock
(Caused by motor or other external factors)
Fan does not turn due to a tangle of foreign matters.
The connector between the high-voltage PCB and the
low-voltage PCB is disconnected.
88
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
there
any foreign YES
matter around the Remove the
fan? foreign matter.
NO
Is
the fan
motor harness NO
connected to indoor Connect
unit PCB? correctly.
YES
With
connector
for fan motor NO
disconnected, can the Replace the fan
fan be easily turned motor.
by hands?
YES
CHECK 1
Check for the fan motor
connector.
Is the
resistance NO
between each pins Replace the fan
above judgement motor.
standard?
YES
Replace the
indoor unit PCB.
89
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
The clogging of a foreign matter
The disconnection of the fan motor connectors
The disconnection of the connectors between the
indoor unit PCB and fan PCB
Defective fan PCB
Defective fan motor
90
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
There
is a foreign YES
Remove the
matter around the foreign matter.
fan.
NO
The
fan motor
connectors of the YES
fan PCB are Connect
disconnected. correctly.
NO
The
connectors
between the
indoor unit PCB and YES
Connect
the fan PCB are correctly.
disconnected.
NO
The
fuse on the fan NO
PCB has no Replace the fan
continuity. PCB.
YES
The
fan can
be moved
lightly by hand after NO
the fan motor connector Replace the fan
of the fan PCB is motor.
removed.
YES
A
91
Si20-701_B Troubleshooting by Remote Controller
The
resistance
between the
power wire YES
terminals of the fan Replace the fan
motor and motor motor.
frame (meal part)
is 1 M or
below.
NO
resistance
The
resistors
among U, V, and NO
W are unbalanced or Replace the fan
short circuited. motor.
YES
Between
VCC and GND
terminals, and YES
between GND and HW, Replace the fan
HV, or HU terminals motor.
are short
circuited.
NO
92
Troubleshooting by Remote Controller Si20-701_B
The
HAP lamp
of the indoor unit YES
PCB blinks and the Replace the fan
HAP lamp of the PCB.
fan PCB is
OFF.
NO
Replace the fan
motor.
93
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective power supply for the indoor unit fan motor
Clogging in the drain pipe
Protection device for the indoor unit fan is operated.
Defective contact for the fan wiring circuit
94
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
power supply
for the indoor unit NO
Connect
fan correctly correctly.
connected?
YES
Is the
fan interlock NO
PCB correctly Connect
connected? correctly.
YES
Restart operation
Is the YES
operation normal? It is supposed
that the system
caused abnormal
NO stop due to
overload /
overcurrent / lock
Is of the indoor unit
200V fan motor.
supplied to the YES
connector of the fan Check the indoor
interlock unit fan motor.
PCB?
NO
Is the
voltage of the YES
connector for the main Replace the fan
PCB DC5V? interlock PCB.
NO
Replace the
indoor unit PCB.
95
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Fan motor lock
Disconnected or defective wiring between fan motor
and PCB
96
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
wiring from
the fan motor NO
securely connected to Connect the
connectors on the wiring and turn
indoor unit ON again.
PCB?
YES
Wiring
between the
indoor unit PCB YES
Fix the wiring
and fan motor is and turn ON
disconnected. again.
NO
97
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective swing flap motor
Defective micro-switch
Defective connector connection
Defective indoor unit PCB
98
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the NO
connector correctly Connect
connected? correctly.
YES
Is the
limit switch's
transfer connector NO
Connect
correctly correctly.
connected?
YES
Turn OFF the power
supply and turn the power
ON, and check whether
the swing flap motor
swings when the power
supply is restarted.
NO NO
220-240 VAC? Replace the
indoor unit PCB.
YES
Replace the
swing flap motor.
99
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Power supply voltage abnormality
Connection defect on signal line
Wiring defect
Instantaneous blackout, others
100
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
There are
problems on the YES
condition of power Correct any fault.
supply described
above.
NO
The YES
error is displayed Check and
again. correct each
wiring.
NO
It is possible to
have external
factor, such as
brownout and
instantaneous
blackout.
101
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective electronic expansion valve coil
Defective indoor unit PCB
Defective connecting cable
102
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
The
electronic
expansion valve is NO
connected to the After connecting,
indoor unit turn the power
PCB. supply OFF and
then restart.
YES
Normal
when coil check
(1) of the electronic NO
Replace the
expansion valve coil electronic
is checked. expansion valve
coil.
YES
The
connecting
cable is short YES
circuited or Replace the
disconnected. connecting cable.
NO
If you turn the
power supply
OFF and turn ON
again, and it still
does not help,
replace the
indoor unit PCB.
103
Si20-701_B Troubleshooting by Remote Controller
(Normal)
Pin No. 1. White 2. Yellow 3. Orange 4. Blue 5. Red 6. Brown
1. White { {
Approx. Approx.
300 150
2. Yellow { {
Approx. Approx.
300 150
3. Orange {
Approx.
150
4. Blue {
Approx.
150
5. Red
6. Brown
{: Continuity
: No continuity
104
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Error in the drain pipe installation
Defective float switch
Defective indoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are float NO
switch and drain pipe Possible
normal? defective float
switch. Check to
YES see if drain-up
height and
A horizontal pipe
length exceed
specifications.
105
Si20-701_B Troubleshooting by Remote Controller
Is the
water drainage NO
Clogged drain
system normal? water discharge
system
Clogged drain
YES pump
Defective float
switch
Replace the
indoor unit PCB.
Check to see if
drain-up height
and horizontal
pipe length
exceed
specifications.
Is drain NO
pump installed? Check the
jumper
connector.
YES
Is drain NO
pump normal? Check the drain
pump and the
drain pipe.
YES
Is
amount of
circulated drain YES
water excessive after Check the water
pump stops drainage system.
operation? Check to see if
drain-up height
and horizontal
NO pipe length
exceed
Does specifications.
drain water YES
flow in reverse during Defective trap in
non-operation? water drainage
system
NO
Replace the
indoor unit PCB.
106
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Humidifier unit (optional accessory) leaking
Defective drain pipe (upward slope, etc.)
Defective indoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Field
drain piping YES
has a defect such as Modify the drain
upward sloping. piping.
NO
A
humidifier
unit (optional YES
accessory) is installed Check if the
on the indoor humidifier unit is
unit. leaking.
NO
Replace the
indoor unit PCB.
107
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective capacity setting adaptor connection
Defective indoor unit PCB
108
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
capacity setting
adaptor plugged into NO
the connector of the Plug a capacitor
indoor unit setting adaptor
PCB? that matches the
capacity of the
unit into the
YES connector. (1)
Turn OFF the power
supply and turn the power
ON.
NO
External factor
(Noise, etc.).
Note:
1 Capacity is factory setting in the data IC on the PCB.
A capacity setting adaptor that matches the capacity
of the unit is required in the following case.
If the indoor unit PCB installed at the factory is for
some reason changed at the installation site, the
capacity will not be contained in the replacement
PCB.
If you connect a capacity setting adaptor to a PCB in
which the capacity is memorized, the capacity setting
for the PCB will become the capacity setting of the
adaptor. (Priority of capacity setting adaptor)
109
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective capacity setting adaptor connection
Defective indoor unit PCB
110
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
capacity setting NO
adaptor connected to
the indoor unit
PCB?
Install a capacitor setting
adaptor that matches the
capacity of the indoor unit.
YES
The error NO
is displayed again. The error was
caused by a
missing capacity
YES resistor.
Replace the
indoor unit PCB.
111
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective capacity setting adaptor connection
Defective indoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
The
indoor unit PCB NO
was replaced with a Replace the
spare PCB. indoor unit PCB.
YES
The
capacity
setting adaptor was YES
installed when Replace the
replacing the indoor unit PCB.
PCB.
NO
Install a capacity
setting adaptor.
112
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective capacity setting adaptor connection
Defective indoor unit PCB
113
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
The
indoor unit PCB NO
was replaced with a Replace the
spare PCB. indoor unit PCB.
YES
Was
the capacity
setting adaptor YES
mounted when Replace the
replacing the indoor unit PCB.
PCB?
NO
Install a capacity
setting adaptor.
114
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Connection defect of the connecter between indoor
unit PCB and fan PCB
Defective indoor unit PCB
Defective fan PCB
External factor, such as instantaneous blackout
115
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
connector
between indoor NO
unit PCB and fan PCB Connect the
accurately connector
connected? accurately.
(1)
YES
Confirm the condition of
transmission on indoor
unit PCB using field
setting mode. (2)
Under
above field
setting mode, NO
Replace the
installation position indoor unit PCB.
is "01".
YES
Note:
1. Pull out and insert the connecter once and check it is
absolutely connected.
116
Troubleshooting by Remote Controller Si20-701_B
117
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Connection defect of the connector indoor unit PCB
and adaptor PCB
Defective indoor unit PCB
Defective adaptor PCB
External factor (Noise, etc.)
118
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
connection of NO
connector on indoor Connect the
unit PCB normal? connector
accurately.
YES
Is the
connection of NO
connector on adaptor Connect the
PCB normal? connector
accurately.
YES
Is the
connector on YES
adaptor PCB not short Short circuit X8A.
circuited?
NO
Is there
an external YES
factor (noise, etc.) Eliminate the
except for a external factor.
fault?
NO
Turn OFF the power
supply and turn the power
ON.
Press the power switch on
the remote controller.
119
Si20-701_B Troubleshooting by Remote Controller
Error is NO
displayed again? Normal
operation.
YES
Check the panel
PCB and indoor
unit PCB.
120
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective connector connection
Defective thermistor
Defective indoor unit PCB
Broken or disconnected wire
121
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is it NO
normal? Correct the
connection.
YES
CHECK 3
Check NO
the thermistor Replace the
resistance. Is it thermistor.
normal?
YES
NO
Is the contact OK? Correct the
contact.
YES
Replace the
outdoor unit
PCB.
122
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective fan PCB
Defective connection of capacity setting adaptor
Setting mistake on site
123
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the type NO
of fan PCB correct? Replace it with
correct fan PCB.
YES
Was
indoor unit NO
PCB (A1P) replaced
with a spare
PCB?
YES
Was
correct
capacity setting NO
adaptor installed when Install correct
replacing it with a capacity setting
spare PCB? adaptor.
YES
After establishing
transmission for
indoor and
outdoor,
diagnose the
operation again.
124
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective sensor
Broken wire
External factor (Noise, etc.)
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
The YES
error is displayed Replace the
again. indoor unit PCB.
NO
External factor
(Noise, etc.)
125
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective sensor
Disconnection
126
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
YES
Does it function It is normal.
normally? (Poor connector
contact)
NO
Is
"CC"
displayed on the YES Replace the
remote controller? humidity sensor
(2) PCB (3).
NO
It is believed that
external factors
(noise or else)
other than failure
caused the error.
Note:
1. To delete the history, the ON/OFF button of the
remote controller must be pressed and held for 5
seconds in the check mode.
2. To display the code, the Inspection/Test Operation
button of the remote controller must be pressed and
held in the normal mode.
3. If "CC" is displayed even after replacing the humidity
sensor PCB assy and taking the steps 1 and 2,
replace the indoor unit PCB assy.
127
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective thermistor
Broken wire
128
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
NO
External factor
(Noise, etc.)
129
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
<Causes related to PCB>
Defective outdoor unit PCB
Defective safety device input connection
Safety devices harness is broken or disconnected
<Causes related to product as a whole>
Stop valve is not opened
Refrigerant piping circuit clogging
130
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the safety
device's lead wire NO
correctly connected to Connect
the outdoor unit correctly.
PCB?
YES
Find safety device which
is not energized.
Temperature of
compressor discharge
pipe is abnormally high.
Is the stop valve fully Open the stop
open? valve.
Is the refrigerant Replace the
piping circuit clogged? clogged part.
Is refrigerant charged Charged to
to the proper level? specified level.
Is the compressor Replace the
defective? compressor.
Temperature of outdoor
unit fan motor coil is
abnormally high.
Is the fan turning Remove the
correctly? obstacles so the
fan turns
correctly, or
replace the fan.
Has draft passage Provide the draft
been provided? passage.
Replace the fan
motor.
Compressor current is
excessive.
Is power being properly Provide suitable
supplied? power supply.
(Voltage, open phase,
etc.)
131
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
<Causes related to safety devices>
Defective safety device input connection
Safety devices harness is broken or disconnected
<Causes related to product as a whole>
Stop valve is set to close
Refrigerant piping circuit clogging
Refrigerant shortage
Defective compressor
132
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the safety
device's lead wire NO
correctly connected to Connect
the outdoor unit correctly.
PCB?
YES
Find safety device which
the contact is open.
Temperature of
compressor discharge
pipe is abnormally high.
Is the stop valve fully Open the stop
open? valve.
Is the refrigerant Replace the
piping circuit clogged? clogged part.
Is refrigerant charged Charged to
to the proper level? specified level.
Is the compressor Replace the
defective? compressor.
133
Si20-701_B Troubleshooting by Remote Controller
134
Troubleshooting by Remote Controller Si20-701_B
Possible Causes
Defective input connection of safety device
Defective harness of safety device
Stop valve is not opened
Clogged refrigerant piping system
Actuation of internal safety device of compressor
(Only for R(Y) 71/100LU)
Defective compressor (Except for R-LU)
135
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the safety
device's lead wire NO
correctly connected to Connect
the outdoor unit (1) correctly.
PCB?
YES
136
Troubleshooting by Remote Controller Si20-701_B
Note:
1. In the case of R(Y)71, or 100, make sure the short
circuiting connector is correctly mounted.
2. R(Y)71, and 100LU, are provided with a safety device
for errors in the compressor.
If the compressor errors due to closed stop valve or
refrigerant shortage, this safety device may be
actuated.
In this case, the compressor cannot restart and its
terminal section has no continuity until the internal
temperature of the compressor falls and the safety
device is reset. (The temperature will fall in a couple
of 10 minutes to a couple of hours.)
137
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Activation of outdoor unit protection device
Defective outdoor unit PCB
Momentary power failure
Open phase in power supply
138
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are the
connectors NO
connected to the Connect the
outdoor unit connector, and
PCB? operate the unit.
YES
Is the YES
contact of Q1L Q1L fan
open? protection device
activation
NO Defective fan
motor, defective
Does capacitor, etc.
the unit
operate normally YES
when remote Momentary
controller is power failure or
used? protection device
activated
previously.
NO Check refrigerant
system.
Replace the
outdoor unit
PCB.
139
Si20-701_B Troubleshooting by Remote Controller
Possible Causes
Defective outdoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Reset YES
normally? External factor
(Noise, or etc.)
NO
Replace the
outdoor unit
PCB.
140
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective outdoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Return to YES
External factor
normal? other than error
NO (for example,
noise etc.).
Check if
inside/outside
relay wires of outdoor YES
Connect the
unit main PCB is inside/outside
disconnected. relay wires
correctly.
NO
Replace the
outdoor unit main
PCB.
141
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective outdoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
normal reset YES
External factor
possible? (Noise, etc.)
NO
Turn OFF the power
supply, remove the fan
motor connector and then
turn ON the power supply
again.
142
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
<Causes related to PCB>
Defective high pressure switch
High pressure switchs harness is broken or
disconnected
Defective high pressure switchs connector connection
Defective outdoor unit PCB
<Causes related to product as a whole>
Soiled outdoor units best exchanger
Room cooling heat load is excessively high
Short circuit of discharged air
Contrary wing
Defective refrigerant piping circuit
143
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are
HPS's for
control and safety NO
connected to the Connect correctly
outdoor unit
PCB? (1)
YES
Turn OFF the power
supply and check the
following after letting the
compressor rest for 2 or 3
minutes.
Do the
HPS's for NO
control and safety Replace the HPS
have continuity? without
continuity.
YES
Is high
pressure during YES
operation abnormally Correct
high? refrigerant piping
circuit.
NO
Replace the
outdoor unit
PCB.
Note:
1. Some models are not equipped with an HPS for
control or safety.
144
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
<Causes related to PCB>
Defective high pressure switch
High pressure switchs harness is broken or
disconnected
Defective high pressure switchs connector connection
Defective outdoor unit PCB
<Causes related to product as a whole>
Indoor unit air filter is clogged
Outdoor unit heat exchanger dirty
Defective outdoor unit fan
Refrigerant overcharged
Stop valve is not opened
145
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is NO
the stop valve Open the stop
opened? valves.
YES
Are
HPS's for
control and safety NO
connected to the Connect
outdoor unit correctly.
PCB?
(1)
YES
Turn OFF the power
supply and check the
following after letting the
compressor rest for 10
minutes.
Do the
HPS's for NO
control and safety Replace the HPS
have continuity? without
continuity.
YES
Is high
pressure during YES
operation abnormally Correct
high? refrigerant piping
circuit
NO
Reset remote controller
and operate again.
146
Troubleshooting by Remote Controller Si20-701_B
Display YES
error "H3" code. Replace the high
pressure switch.
NO
Replace the
outdoor unit
PCB.
Note:
1. Some models are not equipped with an HPS for
control or safety.
147
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Disconnection of connector or terminal on outdoor unit
PCB
Dirty outdoor unit heat exchanger
Defective outdoor unit fan
Refrigerant overcharge
Defective high pressure switch
148
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is protection NO
HPS connected to Correct the
outdoor unit connection.
PCB?
YES
Is there
continuity in NO
Replace the
protection HPS? open-circuit HPS.
YES
Is high
pressure YES
abnormally high during Defective
operation? (1) refrigerant
system.
NO
Replace the
outdoor unit
PCB.
Note:
1. HPS activating value is approximately 3.0 MPa.
149
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective high pressure switch
Disconnection in high pressure switch harness
Defective connection of high pressure switch
connector
Clogged indoor unit suction filter (in heating)
Dirty outdoor unit heat exchanger
Defective outdoor unit fan
Refrigerant overcharge
Stop valve is not opened
150
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
Open the stop
valve open? valve.
YES
Are
control and
protection high NO
pressure switch Connect
connected to correctly.
outdoor unit
PCB?
YES
Turn OFF the power
supply. Wait for 10
minutes after compressor
stops operating, then
check the following.
Is
there
continuity in control NO
and protection high Replace the high
pressure pressure switch
switch? with no
continuity.
YES
CHECK 4 YES
Is high pressure Correct the high
abnormally pressure.
high?
NO
Set the remote controller
and turn ON again.
151
Si20-701_B Troubleshooting by Remote Controller
Is
the error H3 YES
Replace the high
displayed? pressure switch.
NO
Except RZQ-C
Replace the
outdoor unit
RZQ-C PCB.
CHECK 4 YES
The pressure is Correct the
abnormally failure.
high. Check
"Refrigerant
overcharge"
CHECK 10
Replace the
outdoor unit PCB
(A1P).
152
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Actuation of outdoor unit high pressure switch
Defective high pressure switch
Defective outdoor unit PCB
Instantaneous power failure
Defective high pressure sensor
153
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are the 3 NO
points above Rectify defective
OK? points, if any.
YES
Mount a pressure gauge on the high pressure
service port.
Connect the Service Checker.
Reset the operation using the remote controller,
and then restart the operation.
YES
Are
the
characteristics of NO
the high pressure Replace the high
sensor normal? pressure sensor.
(1)
YES
Is the
pressure NO
detected with the Replace the
PCB normal? outdoor unit main
(2) PCB.
YES
A
154
Troubleshooting by Remote Controller Si20-701_B
Note:
1: Make a comparison between the voltage of the
pressure sensor and that read by the pressure gauge.
(As to the voltage of the pressure sensor, make
measurement of voltage at the connector, and then
convert it to pressure according to information on
P.471.)
2: Make a comparison between the high pressure value
checked with the Service Checker and the voltage of
the pressure sensor (1).
3: Make measurement of voltage of the pressure
sensor.
+5V
Connector for high
pressure sensor (Red)
(4) Red
(3) Black High
pressure
(2) sensor
Micro-computer (1)
A/D input White
Make measurement of DC
voltage between these wires.
155
Si20-701_B Troubleshooting by Remote Controller
[In heating]
The error is detected by the indoor unit intermediate
heat exchanger thermistor (R3T).
[In heating]
When the indoor unit intermediate thermistor (R3T)
detects the pressure shown below.
3.92 MPa or more continuously for 1 minute
(Reference: equivalent saturation temperature 62C)
Supposed Causes
Dirt and blockage of the outdoor unit heat exchanger
Defective outdoor unit fan motor
Defective indoor unit fan motor
Defective electronic expansion valve
Refrigerant overcharge
Defective indoor unit PCB
Defective outdoor unit inverter PCB
156
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
[In cooling]
Are
the
characteristics of NO
the outdoor unit Replace the
intermediate outdoor unit
thermistor intermediate heat
normal? exchanger
thermistor.
YES
The
outdoor unit YES
heat exchanger is Clean or remove
clogged or the clogging
blocked. item.
NO
The
outdoor unit fan NO
is rotating during Remove the
operation. foreign matter.
Replace the fan
YES motor.
Are the
operation of NO
electronic expansion Troubleshooting
valve normal? "E9"
YES
CHECK 4 YES
High pressure is CHECK 10
too high.
NO
Replace the
outdoor unit
PCB.
If error is
displayed again,
replace the
inverter PCB.
157
Si20-701_B Troubleshooting by Remote Controller
[In heating]
Are
the
characteristics of NO
the indoor unit Replace the
intermediate indoor unit
thermistor intermediate heat
normal? exchanger
thermistor.
YES
The
indoor unit fan is NO
rotating during Remove the
operation. foreign matter.
Replace the fan
motor.
YES
Are the
operation of NO
electronic expansion Troubleshooting
valve normal? "E9"
YES
CHECK 4 YES
High pressure is CHECK 10
too high.
NO
Replace the
outdoor unit
PCB.
If error is
displayed again,
replace the
inverter PCB.
158
Troubleshooting by Remote Controller Si20-701_B
[In heating]
Detect the continuity of high pressure switch (S1PH)
with the protection device circuit.
The error is detected by the indoor unit intermediate
heat exchanger thermistor (R3T).
Supposed Causes
Stop valve is not opened
Harness breaking or poor connector connection of the
high pressure switch
Defective high pressure switch
Indoor unit suction filter is blocked (In heating)
Defective indoor unit fan (In heating)
Outdoor heat exchanger is dirt (In cooling)
Defective outdoor unit fan (In cooling)
Refrigerant overcharge
Defective outdoor unit PCB
159
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
Open the stop
valve open? valve.
YES
Are the
connection of
the connector on NO
PCB and the Correctly
connection to the connect.
switch unit
normal?
YES
After turning OFF the
power and stopping the
compressor for 10
minutes, check the items
below.
Is
there NO
continuity in the Replace the high
high pressure pressure switch
switch? with no
continuity.
YES
Is
there
continuity in NO
the high pressure Replace the
switch connecting connecting line.
line?
YES
160
Troubleshooting by Remote Controller Si20-701_B
A
[In cooling] [In heating]
Are
the
characteristics of NO
the outdoor unit Replace the
intermediate outdoor unit
thermistor intermediate heat
normal? Are exchanger
the thermistor.
characteristics of NO
YES the indoor unit Replace the
intermediate indoor unit
thermistor intermediate heat
normal? exchanger
thermistor.
YES
"H3" is YES
displayed? Replace the high
pressure switch.
NO
CHECK 4 YES
High pressure is too CHECK 10
high.
NO
Replace the
outdoor unit
PCB.
If error is
displayed again,
replace the
inverter PCB.
161
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
<Causes related to PCB>
Defective low pressure switch
Low pressure switchs harness is broken or
disconnected
Defective low pressure switchs connector connection
Defective outdoor unit PCB
<Causes related to product as a whole>
Defective refrigerant piping circuit
Stop valve is not opened (For R(Y)-LU)
162
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
NO R(Y)-LU
series?
YES
Is
the stop NO
Open the stop
valve opened? valves.
YES
Is low
pressure
sensor for safety NO
Connect
connected to the correctly.
outdoor unit
PCB?
YES
Turn OFF the power
supply and check the
following after letting the
compressor rest for 2 or 3
minutes.
Does
the low
pressure sensor for NO
Replace the low
safety have pressure sensor
continuity? without continuity.
YES
Is low
pressure during YES
operation abnormally Correct
low? refrigerant piping
circuit.
NO
Replace the
outdoor unit
PCB.
163
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
The stop valve is not opened
Defective pressure sensor and intermittent harness
Defective thermistor
164
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
Open the stop
valve open? valve.
YES
165
Si20-701_B Troubleshooting by Remote Controller
Is the B
pressure sensor NO YES
properly connected to Connect the
the outdoor unit connector
PCB? Remove the thermistor properly.
from the outdoor unit PCB
RZQG YES and measure resistance.
except RZQG
Is it normal? NO
Replace the
CHECK 6 group
CHECK 7 thermistor.
Measure YES
voltage between
the connector pins
(1) and (3) of the NO
Replace the
connector. pressure
Is the relation sensor.
between low
pressure and
voltage
normal?
YES
CHECK 3
Remove the
thermistor from the NO
indoor unit PCB and Replace the
measure the indoor unit
resistance. intermediate
Is it normal? thermistor.
YES
166
Troubleshooting by Remote Controller Si20-701_B
Is low-pressure NO
abnormally low? Replace the
outdoor unit
CHECK 5 PCB.
Replace the
YES PCB equipped
with resin case.
Correct the
refrigerant
system defect.
167
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Abnormal drop of low pressure
Defective low pressure sensor
Defective outdoor unit PCB
Stop valve is not opened
Clogged filter
168
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is NO
the stop valve Open the stop
open? valve.
YES
Are the
characteristics NO
of the low pressure Replace the low
sensor normal? pressure sensor.
(1)
YES
Check if
the low
pressure value
and the actual NO
measurement value by Replace the
pressure sensor outdoor unit main
are the same. PCB.
YES
The low pressure sensor is normal, and the
pressure detected with the PCB is also normal.
The low pressure has really become low.
169
Si20-701_B Troubleshooting by Remote Controller
Note:
1. Make a comparison between the voltage of the
pressure sensor and that read by the pressure
gauge.
(As to the voltage of the pressure sensor, make
measurement of voltage at the connector, and then
convert it to pressure. CHECK 7 )
2. Make measurement of voltage of the pressure
sensor.
+5V
Connector for low pressure sensor
(Blue)
(4) Red
(1)
170
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Compressor is not defective.
Stop valve is not opened
Defective connection of low pressure switch connector
Disconnection in low pressure switch harness
Defective low pressure switch
Defective refrigerant system
Refrigerant shortage
Defective outdoor unit PCB
171
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is NO
the stop valve Open the stop
opened? valve.
YES
Is the
connector for
the low pressure NO
switch properly Connect
connected to the correctly.
outdoor unit
PCB?
YES
Turn OFF the power
supply. Wait for a few
minutes after compressor
stops operating, then
check the following.
Is there
a continuity in NO
Replace the low
the low pressure pressure switch.
switch?
YES
CHECK 5 YES
Is low pressure Rectify the
abnormally cause.
low?
NO
Replace the
outdoor unit
PCB.
172
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective low pressure switch
Disconnection of the wire harness of the low pressure
switch
Defective connection of the connector of the low
pressure switch
The refrigerant piping circuit abnormality
The stop valve is not opened
Defective outdoor unit main PCB
Refrigerant shortage
173
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is NO
the stop valve Open the stop
open? valve.
YES
Is
the
connector (1)
for the low pressure NO
sensor correctly Connect
connected to the correctly.
outdoor unit
PCB?
YES
Is
the
converted
pressure based on NO
the measured voltage Replace the low
normal? pressure sensor.
(3).
YES
CHECK 5 YES
Is low pressure Correct the error.
abnormally
low?
NO
Replace the
outdoor unit PCB
(A1P).
174
Troubleshooting by Remote Controller Si20-701_B
1.5
PL
1.0
0.5
-0.5
-0.5 0 0.5 1 1.5 2 2.5 3 3.5 4
Vcc
Output voltage V
PL=0.57V-0.28
PL: detected pressure (Mpa)
V: output voltage (V)
175
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Compressor lock
Incorrect UVWN wiring
Defective inverter PCB
Stop valve is not opened
High discharge pressure starting (For RZQ-K, RZQG,
RZR-KU/HU)
176
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
Open the stop
valve open? valve.
RZQ-C
YES
Is the NO
UVWN wiring Connect
normal? correctly.
YES
Is high
differential YES
pressure at Remedy the
starting? cause.
NO
Check and
see whether YES
compressor is short- Replace the
circuited or compressor.
ground.
RZQ-C/K, RZR-KU/HU NO
RZQG
RZQ-H, RZQ(S)-B/C
Are
inverter output NO
voltages the same for Replace the
3 phases? inverter PCB.
YES
Does
low or high
pressure vary YES
even instantaneously
when restarting
compressor?
NO
Replace the
compressor.
177
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Inverter compressor lock
High differential pressure (0.5MPa or more)
Incorrect UVW wiring
Defective inverter PCB
Stop valve is not opened
178
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
Onsite causes.
valve open? Open the stop
YES valve.
The
compressor cable YES
Replace the
has a defect. cable, and then
securely connect
NO the connectors.
Are wire
connections
made to phases U, V, NO
Power OFF Make wire
and W in the proper
order and connections
manner? without a
mistake.
W
YES
U
Are wire
connections V
properly made NO
(according to the Make wire
Are the wire connections
Wiring connections without a
Diagram)? mixed up mistake.
with those
YES for non-
inverter
A compressor?
179
Si20-701_B Troubleshooting by Remote Controller
The
insulation
resistance is low YES
Replace the
(i.e., not more than compressor.
100k.)
NO
Some YES
phase has a broken
wire.
NO
Restart the
compressor, and NO
then check whether End of work
or not the error Faulty pressure
recurs. equalization or
else may have
occurred.
YES Check the
Power ON refrigerant
system.
Has the
compressor
started up at high YES
differential pressure Defective
(not less than pressure
0.5MPa)? equalization:
Check the
refrigerant
NO system.
Replace the
compressor.
Conduct checks
and diagnosis
of the
compressor.
180
Troubleshooting by Remote Controller Si20-701_B
Possible Causes
High pressure increased too high
Voltage drop
Stop valve is not opened
Defective compressor (compressor lock)
181
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
valve open? Open the stop
valve.
YES
CHECK 4 YES
High pressure is Correct the high
too high. pressure.
NO
The YES
voltage has Correct the
dropped. power supply.
NO
Spare PCB
is installed using YES
an adaptor not suitable Connect an
for the applicable adaptor suitable
model. for the applicable
(1) model.
NO
Check for the
compressor.
Note:
For details, refer to information in troubleshooting PJ.
182
Troubleshooting by Remote Controller Si20-701_B
183
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective fan motor
The harness connector between fan motor and PCB is
left in disconnected, or defective connector
Fan does not run due to foreign matters tangled
Defective outdoor unit PCB
Blowout of fuse
External factor (Noise, etc.)
184
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
the supply
voltage within the NO
range (V1: 220-240V, Ask repair so that
Y4A: 380- the supply
415V)? voltage will be
within the normal
range.
YES
Is the
fan motor
connector correctly NO
Properly connect
connected to the the connector.
outdoor unit
PCB?
YES
Is there
any foreign matter NO
around the
fan? Remove the foreign
YES matter.
Is the fan NO
rotatable easily by
hand?
Replace the fan motor.
YES
CHECK 1
Check the resistance
value for the fan motor.
185
Si20-701_B Troubleshooting by Remote Controller
Is the
resistance value NO
of the fan motor Replace the fan
normal? motor.
YES
Does the NO
fuse have continuity? Replace the fuse.
YES
186
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Disconnection of connector
Defective fan motor
The harness connector between fan motor and PCB is
left in disconnected, or defective connector
Fan does not run due to foreign matters tangled
Clearing condition: Operate for 5 minutes (normal)
187
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
There
is a foreign YES
substance found Remove the
around the object foreign
fan. substance.
NO
Check the
connection of
the connector. YES
Plug the
Disconnection of the connector.
connectors is
found.
NO
Check the
color of the
relay. YES
Connection error is Correct the
found in the relay connection of the
connector. relay connector.
NO
188
Troubleshooting by Remote Controller Si20-701_B
No
continuity on the YES
fan inverter PCB Replace the fan
fuse inverter PCB.
NO
Unable to
rotate the fan
manually with ease YES
Replace the
when removing the corresponding
connector of the fan motor.
fan motor
NO
The
resistance
value between
the power supply YES
wire terminal of fan Replace the
motor and the motor corresponding
frame (metal) is fan motor.
1M and
below.
NO
CHECK 2
Check the fan motor
connector (power supply
wire)
The
resistance
value between
UVW phases of fan YES
motor is out of balance, Replace the
or short circuit corresponding
between UVW fan motor.
phases
NO
189
Si20-701_B Troubleshooting by Remote Controller
CHECK 1
Check the fan motor
connector (signal wire)
The
signal wire
short circuits YES
between Vcc and Replace the
GND / UVW corresponding
and GND fan motor.
NO
HAP
lamp for
the PCB does
not blink on the YES
Replace the fan
condition that HAP inverter PCB.
lamp for PCB is
blinking.
NO
Replace the fan
motor 2.
190
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective fan motor
The harness connector between fan motor and PCB is
left in disconnected, or defective connector
Fan does not run due to foreign matters tangled
Clearing condition: Operate for 5 minutes (normal)
191
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are
there any YES
foreign matters Remove the
around the foreign matters.
fan?
NO
Any
of the
fan motor
connectors X1A
or the relay harness YES
connectors Z5C and Insert the
X1A is connector
disconnected. disconnected.
NO
Different
power
supply cable
connector and
signal cable
connector have been
connected to the relay YES
harness. (Power supply Use the
and signal cable connectors of the
connectors of same color in
different colors combination for
are connected the power supply
for one and and signal cables
the same for the relay
motor.) harness (e.g.
natural color to
natural color, or
red to red).
NO
192
Troubleshooting by Remote Controller Si20-701_B
Connectors of
harness between
the compressor YES
inverter PCB and the Insert the
fan inverter PCB are connectors in the
disconnected. harness.
NO
The
fuse
(white tubular
fuse) on the fan YES
inverter PCB has a Replace the fan
broken wire (has inverter PCB.
no continuity).
NO
With the
connector
disconnected from YES
the fan motor, the fan Replace the
cannot be outdoor unit fan
rotated by motor.
hand.
NO
Resistance
between the fan
motor power supply YES
cable terminal and the Replace the
motor frame (metal outdoor unit fan
part) is not motor.
more than
1M.
NO
193
Si20-701_B Troubleshooting by Remote Controller
CHECK 2
Check for the fan motor
connector (Power supply
cable)
Resistance
of the U, V, and
W phases of the
fan motor has got YES
imbalanced or short Replace the
circuits have been outdoor unit fan
established motor.
among the U,
V, and W
phases.
NO
CHECK 1
Check for the fan motor
connector (Signal cable)
Has a
short
circuit been
established
between the fan motor YES
signal cables Vcc and Replace the
GND, and UVW and outdoor unit fan
GND, motor.
respectively?
NO
194
Troubleshooting by Remote Controller Si20-701_B
The
LED
(HAP) on
the compressor
inverter PCB is YES
blinking, but the LED Replace the fan
(HAP) on the fan inverter PCB.
inverter PCB is
not blinking.
NO
Replace the
outdoor unit fan
motor.
195
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective electronic expansion valve
Electronic expansion valves harness is broken or
disconnected.
Defective electronic expansion valves connector
connection
Defective outdoor unit PCB
External factor (Noise, etc.)
196
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
YES
Normal reset? External factor
(Noise, etc.).
NO
Is the
electronic
expansion valve coil NO
Connect it
connected to correctly.
outdoor unit
PCB?
YES
CHECK 8
Is resistance NO
of electronic Replace the
expansion valve's electronic
coil normal? expansion valve.
YES
Replace the
outdoor unit
PCB.
197
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective electronic expansion valve
Open circuit in electronic expansion valve harness
Defective connection of electronic expansion valve
connector
Defective outdoor unit PCB
External factor (Noise, etc.)
198
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
electronic
expansion valve YES
connector Correct the
disconnected? connection.
NO
Turn OFF the power
supply and turn the power
ON.
Is coil
resistance of NO
electronic expansion Replace the
valve normal? electronic
expansion valve.
YES
Replace the
outdoor unit
PCB.
199
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective electronic expansion valve coil
Defective outdoor unit PCB
Defective connecting cable
200
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Return to YES
External factor
normal? other than error
NO (for example,
noise etc.).
Electronic
expansion valve is NO
connected to X21A and After connecting,
X23A of outdoor turn the power
unit PCB. ON and then
restart again.
YES
Normal
when coil check
(1) of the electronic NO
Replace the
expansion valve coil electronic
is checked. expansion valve
coil.
YES
The
connecting
cable is short- YES
circuited or Replace the
disconnected. connecting cable.
NO
Replace the
outdoor unit
PCB.
201
Si20-701_B Troubleshooting by Remote Controller
Note:
1. Make measurement of resistance between the
connector pins, and then make sure the resistance
falls in the range of 40 to 50.
(Orange) 1
(Red) 2
Measuring points
(Yellow) 3 1-6
2-6
(Black) 4 3-6
4-6
5
(Gray) 6
202
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective electronic expansion valve
Defective solenoid valve
Defective check valve
Disconnection of electronic expansion valve harness
Defective connection of electronic expansion valve
connector
Defective each thermistor
Defective mounting
Defective pressure sensor
Defective outdoor unit control PCB
203
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
NO The
error is displayed
again.
YES
Is the
electronic
expansion valve NO
connector properly Connect
connected to the properly.
outdoor unit
PCB?
YES
Is the coil
resistance of the NO
electronic expansion Replace the
valve normal? electronic
CHECK 8 expansion valve
coil.
Is there
difference in
temperature before NO
and after electronic Replace the body
expansion valve of the electronic
(Y1E) during expansion valve
operation? (Y1E).
YES
A
204
Troubleshooting by Remote Controller Si20-701_B
Is the
temperature
sensor of each
thermistor (suction
pipe, discharge pipe,
intermediate heat NO
Mount properly.
exchanger and heat
exchanger distributor
pipe thermistors)
mounted
properly?
YES
Are the
characteristics of NO
each thermistor Replace the
normal? defective
CHECK 3 thermistor.
YES
Are the
pressure sensor NO
characteristics Replace the
normal? pressure sensor.
CHECK 7
YES
B
205
Si20-701_B Troubleshooting by Remote Controller
Actually, it is in wet
operation.
Refer to CHECK 9 to
eliminate the causes of
wet operation.
Restart operation.
206
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective electronic expansion valve
Defective solenoid valve
Defective check valve
Disconnection of electronic expansion valve harness
Defective connection of electronic expansion valve
connector
Defective each thermistor
Defective mounting
Defective outdoor unit control PCB
207
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
NO The
error is displayed
again.
YES
Is the
electronic
expansion valve NO
connector properly Connect
connected to the properly.
outdoor unit
PCB?
YES
CHECK 8
Is the coil resistance NO
of the electronic Replace the
expansion valve electronic
normal? expansion valve
coil.
YES
208
Troubleshooting by Remote Controller Si20-701_B
Is the
temperature
sensor of each
thermistor (suction
pipe, discharge pipe NO
and heat exchanger Mount properly.
distributor pipe
thermistors)
mounted
properly?
YES
CHECK 3
Are the NO
characteristics of each Replace the
thermistor defective
normal? thermistor.
YES
Actually, it is in wet
operation.
Restart operation.
209
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Improper amount of refrigerant
Refrigerant piping circuit clogging
210
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
amount of NO
refrigerant Charge with the
correct? proper amount of
refrigerant.
YES
Has
the thermistor YES
come off the Correctly place
discharge pipe the discharge
port? pipe thermistor.
NO
Is
electronic NO
expansion valve
fitted?
YES
Is
electronic
expansion valve coil NO
Check refrigerant
disconnected from piping circuit
valve body? clogging.
YES
Correctly place
the electronic
expansion valve
coil to valve
body.
211
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Improper amount of refrigerant
Refrigerant piping circuit clogging
Discharge pipe thermistor comes off the discharge
pipe port
Electronic expansion valve coil is disconnected from
valve body
Compressor lead wire has lack of phase
212
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Has
the thermistor NO
come off the discharge Correctly place
pipe port? the discharge
pipe thermistor.
YES
NO
Is the
amount of YES
refrigerant Charge with the
correct? proper amount of
refrigerant.
NO
Is
electronic NO
expansion valve
fitted?
YES
Is
electronic
expansion valve coil NO
CHECK 11
disconnected from
valve body? Check refrigerant
piping circuit
clogging.
YES
Correctly place
the electronic
expansion valve
coil to valve
body.
213
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective discharge pipe thermistor
Defective connection of discharge pipe thermistor
Defective outdoor unit PCB
214
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
discharge pipe YES
temperature 123.5C Error in
or higher? refrigerant
system, such as
NO refrigerant
shortage and
defective
compressor.
Conduct
Is inspection.
discharge pipe NO
thermistor connected Correct the
to the correct connection, and
connector? operate the unit.
YES
CHECK 3
Is discharge NO
pipe thermistor Replace the
characteristic discharge pipe
normal? thermistor.
YES
Replace the
outdoor unit
PCB.
215
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective discharge pipe temperature sensor
Defective connection of discharge pipe temperature
sensor
Defective outdoor unit PCB
216
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Discharge
pipe temperature is YES
115C or higher when Refrigerant
the unit stop by shortage,
error. compression
defect, etc.
Defective the
NO refrigerant
system.
Pull out the discharge
pipe thermistor from the
outdoor unit PCB, and
then make measurement
of resistance using a
multiple meter.
CHECK 3
Are the
characteristics of the NO
Replace the
discharge pipe discharge pipe
thermistor normal? thermistor.
(3.5~400k)
YES
Replace the
outdoor unit
PCB.
217
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective discharge pipe thermistor
Defective connection of discharge pipe thermistor
Refrigerant shortage
Defective compressor
Disconnection of discharge pipe thermistor
Defective outdoor unit PCB
218
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
discharge pipe YES
Abnormality in
temperature refrigerant system
high? such as refrigerant
shortage,
NO defective
compressor, etc.
Is the Conduct
discharge inspection
pipe thermistor NO
Connect
correctly connected correctly, and
to PCB? operate the unit
again.
YES
Is the
discharge
pipe thermistor NO
attached to the Attach the
discharge thermistor, and
pipe? operate the unit
again.
YES
CHECK 3
Is the discharge NO
Replace the
pipe thermistor discharge pipe
characteristic thermistor.
normal?
YES
Replace the
outdoor unit
control PCB.
219
Si20-701_B Troubleshooting by Remote Controller
Possible Causes
Clogged indoor unit suction filter (in heating operation)
Dirty outdoor unit heat exchanger
Defective outdoor unit fan
Excessive charging of refrigerant
Stop valve is not opened
220
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
valve open? Open the stop
valve.
YES
CHECK 4 YES
High pressure Correct the high
is too high. pressure.
In cooling
operation: Dirty
NO outdoor unit
heat exchanger
In heating
operation: Dirty
indoor unit heat
exchanger
Excessive
charging of
refrigerant
Replace the
outdoor unit
PCB.
221
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Refrigerant overcharge
Disconnection of outdoor air thermistor
Disconnection of heat exchanger deicer thermistor
Defective liquid pipe thermistor
222
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are
the above NO
thermistor installed Install the
on pipes thermistor
correctly? correctly.
YES
Remove the outdoor air
thermistor, heat
exchanger deicer
thermistor and the liquid
pipe thermistor from the
outdoor unit PCB and
measure resistance with
a tester.
Is the
characteristic of
the above thermistor NO
normal? Replace the
thermistor.
CHECK 3
YES
Rectify the
refrigerant
overcharge.
223
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective high pressure switch
High pressure switchs harness is broken or
disconnected
Defective high pressure switchs connector connection
Defective outdoor unit PCB
224
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are high
pressure switch NO
for control and safety Connect correctly
connected to the
outdoor unit
PCB?
YES
Check the following after
letting rest for 2 or 3
minutes.
Do the
high pressure NO
switch for control and Replace the high
safety have pressure switch
continuity? without
continuity.
YES
Replace the
outdoor unit
PCB.
225
Si20-701_B Troubleshooting by Remote Controller
Possible Causes
Defective high pressure switch
Disconnection in harness of high pressure switch
Defective connection of high pressure switch
connector
Defective outdoor unit PCB
Disconnection in lead wire
226
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
connector of
high pressure switch NO
correctly connected Connect
to the outdoor correctly.
unit PCB?
YES
Wait for 10 minutes after
the unit stops operating,
then proceed to the
subsequent check.
Does
the high NO
pressure switch have Replace the high
continuity? pressure switch.
The normal
resistance is
YES 10 or less.
Does
the lead wire NO
have continuity? Replace the lead
wire.
YES
Replace the
outdoor unit
PCB.
227
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective high pressure switch
Open circuit in high pressure switch harness
Defective connection of high pressure switch
connector
Defective outdoor unit PCB.
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
protection HPS NO
connector connected to Correct the
outdoor unit connection.
PCB?
YES
Wait 2 to 3 minutes after
the unit stops operating,
then check the following.
Is there NO
continuity in protection Replace the
HPS? open-circuit HPS.
YES
Replace the
outdoor unit
PCB.
228
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Incomplete high pressure switch
Disconnection in high pressure switch harness
Defective connection of high pressure switch
connector
Defective outdoor unit PCB
Disconnected lead wire
229
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
protection
high pressure
switch connector NO
Connect
correctly connected correctly.
to outdoor unit
PCB?
YES
Wait for 10 minutes after
the unit stops operating,
then check the following.
Is there
continuity in NO
each protection high Replace the high
pressure switch? pressure switch
with no
continuity.
Resistance in
YES normal operation:
10 or less
Is there NO
continuity in lead Replace the lead
wire? wire.
YES
Replace the
outdoor unit
control PCB.
230
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective low pressure sensor
Disconnection in low pressure switch harness
Defective connection of low pressure sensor
connector
Defective outdoor unit PCB
Refrigerant shortage
Stop valve is not opened
Defective electronic expansion valve
Clogged check valve
231
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is low
pressure sensor NO
connector connected Connect
to outdoor unit correctly.
PCB?
YES
Turn OFF the power
supply. After 10 minutes,
check the following.
CHECK 5
NO
Is low pressure Correct the
abnormally low? refrigerant pipe.
YES
Is there
continuity in NO
control and protection Replace the low
low pressure pressure sensor.
switch?
YES
Replace the
outdoor unit
control PCB.
232
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective LPS
Disconnection in LPS harness
Defective connection of LPS connector
Defective outdoor unit PCB
Refrigerant shortage
Stop valve is not opened
Defective electronic expansion valve
Clogged check valve
233
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
LPS
connector NO
connected to outdoor Connect
unit PCB? correctly.
YES
Turn OFF the power
supply. After 10 minutes,
check the following.
CHECK 4 NO
Is low pressure Correct the
abnormally refrigerant pipe.
low?
YES
Is there
continuity in NO
control and protection Replace the LPS.
LPS?
YES
Replace the
outdoor unit
control PCB.
234
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Abnormal fan motor signal (circuit error)
Broken, short or disconnection connector of fan motor
connection cable
Defective fan Inverter PCB
235
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
fan motor
connector NO
connected to PCB for Connect
fan inverter correctly.
correctly?
YES
The
resistance
of fan motor read
wire connector pins NO
Replace the fan
between Vcc-UVW motor.
and GND-UVW
balanced?
YES
Replace the fan
inverter PCB.
Note:
1: Disconnect connector and measure the following
resistance.
5 Gray GND
4 Pink Vcc
Measure the
resistance
3 Orange W between Vcc-
UVW and
GND-UVW.
2 Blue V
1 Yellow U
236
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective thermistor
Defective connection of connector
Defective outdoor unit control PCB
237
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
NO
Normal? Connect
correctly.
YES
CHECK 1 NO
Replace the
Normal? thermistor.
YES
Replace the
outdoor unit
control PCB.
238
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective outdoor air thermistor
Defective outdoor air thermistor connector connection
Defective outdoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Disconnect the outdoor
air thermistor from the
outdoor unit PCB and
measure the resistance.
Is the NO
thermistor Replace the
normal? outdoor air
thermistor.
YES
If contact is OK,
replace the
outdoor unit
PCB.
239
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective outdoor air thermistor
Defective connection of outdoor air thermistor
connector
Defective outdoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
connector
connected to the NO
Connect the
outdoor unit thermistor, and
PCB? operate the unit.
YES
Disconnect
thermistor from
outdoor unit PCB, and NO
Replace the
measure resistance. thermistor.
Is resistance
normal?
YES
Replace the
outdoor unit
PCB.
240
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective pressure sensor
Defective outdoor unit PCB
Incorrect connection of connector
241
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is it NO
connected correctly? Connect
correctly.
YES
CHECK 7
Measure the voltage
between the pins # (1)
and (3) of the above
connector.
Is the
relation between NO
the pressure and the Replace the
voltage normal? pressure sensor.
YES
Replace the
outdoor unit
PCB.
242
Troubleshooting by Remote Controller Si20-701_B
Possible Causes
Defective current sensor
Defective outdoor unit PCB
Actuation of internal safety device of compressor
(Only on R(Y)71/100LU)
243
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
applied model YES
R(Y)71 or 100?
Check the compressor for
NO continuity.
The NO
compressor has The internal
continuity. safety device of
the compressor
YES may have been
actuated.
The safety
device takes a
Restart the compressor couple of 10
using a remote controller. minutes to a
couple of hours
to be reset.
After the safety
device is reset,
restart the
compressor for
The diagnosis.
error is NO
External factor
displayed again. (Noise, etc.)
YES
Replace the
outdoor unit
PCB.
244
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective discharge pipe thermistor
Defective discharge pipe thermistors connector
connection
Defective outdoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the NO
thermistor Replace the
normal? discharge pipe
thermistor.
YES
If contact is OK,
replace the
outdoor unit
PCB.
245
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective discharge pipe thermistor
Incomplete connection of discharge pipe thermistor
Defective outdoor unit PCB
246
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Connector is
connected to the NO
Connect
outdoor unit PCB. thermistor and
restart operation.
YES
Resistance
measured after
remove thermistor NO
from outdoor unit PCB is Replace the
normal. thermistor.
CHECK 3
YES
Replace the
outdoor unit
PCB.
247
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective thermistor for outdoor unit suction pipe
Defective outdoor unit PCB
Defective thermistor connection
248
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Connector is NO
connected to the Connect the
outdoor unit connector and
PCB. turn ON again.
YES
Resistance
is normal when
measured after
disconnecting the NO
thermistor from the Replace the
outdoor unit thermistor.
PCB.
CHECK 3
YES
Replace the
outdoor unit
PCB.
249
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective heat exchanger thermistor
Defective heat exchanger thermistors connector
connection
Defective outdoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the NO
thermistor normal? Replace the heat
exchanger
thermistor.
YES
If contact is OK,
replace the
outdoor unit
PCB.
250
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective heat exchanger thermistor
Incomplete connection of heat exchanger thermistor
Defective outdoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Connector is NO
connected to the Connect
outdoor unit thermistor and
PCB. restart operation.
YES
Resistance
measured after
remove thermistor NO
from outdoor unit PCB is Replace the
normal. thermistor.
CHECK 3
YES
Replace the
outdoor unit
PCB.
251
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective liquid pipe thermistor (R6T)
Defective outdoor unit PCB
Defective thermistor connection
252
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
connector
for liquid pipe NO
thermistor connected Connect the
to the outdoor connector and
unit PCB? operate the unit
again.
YES
CHECK 3
Is the resistance
measured after NO
removing the thermistor Replace the
from outdoor unit thermistor.
PCB normal?
YES
Replace the
outdoor unit
PCB.
253
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective subcooling heat exchanger gas pipe
thermistor
Defective outdoor unit PCB
254
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
connector for
subcooling heat
exchanger gas pipe NO
Connect the
thermistor connected connector and
to the outdoor operate the unit
unit PCB? again.
YES
CHECK 3
Is the resistance
measured after NO
removing the thermistor Replace the
from outdoor unit thermistor.
PCB normal?
YES
Replace the
outdoor unit
PCB.
255
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective high pressure sensor
Connection of low pressure sensor with wrong
connection
Defective outdoor unit PCB
256
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
The high
pressure sensor NO
is connected to X32A Connect the high
of outdoor unit pressure sensor
PCB. and turn ON
again.
YES
Measure the voltage (VH)
between the pins # (1)
and (3) of the above
connector (1).
YES
Is the
relationship YES
between high Replace the
pressure and VH outdoor unit
normal? PCB.
(2)
NO
Replace the high
pressure sensor.
Note:
1: Voltage measurement point
(4) Red
GND (3) Black
(2)
257
Si20-701_B Troubleshooting by Remote Controller
3.0
PH
2.5
Detected pressure PH (MPa)
2.0
1.5
1.0
0.5
0
PH = 1.38V-0.69
PH : Detected pressure (MPa)
-0.5 V : Output Voltage (V)
-0.5 0 0.5 1 1.5 2 2.5 3 3.5 4
Output voltage V VDC
258
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective low pressure sensor system
Connection of high pressure sensor with wrong
connection.
Defective outdoor unit PCB.
259
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
The low
pressure sensor is NO
connected to the Connect low
outdoor unit pressure sensor
PCB. properly and
restart system.
YES
The
relationship
between the
(1) VH and low
pressure is normal (2) YES
when voltage is Replace the
measured between outdoor unit
pins (2) and (3) PCB.
of outdoor
unit PCB
(1).
NO
Replace the low
pressure sensor.
(4) Red
GND (3) Black
Micro-computer (2) White
A/D input
(1)
260
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective outdoor unit PCB
Defective IPM
Defective Current sensor
Defective MP-PAM
Defective IGBT or drive circuit
261
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
power supply NO
voltage between 180 Request an
and 220 VAC? improvement to
make the power
supply voltage
YES fall within the
standard range.
Turn OFF the power
supply.
Is the
lead wire
for compressor NO
connected to PCB and Connect tightly
compressor without and correctly.
becoming
loose?
YES
Check the resistance
value for the fan motor.
Is the
resistance value NO
of the fan motor Replace the fan
normal? motor.
YES
Does NO
the fuse have Replace the fuse.
continuity? Use only
specified fuses.
YES
Power ON again.
The YES
error is displayed Replace the
again. outdoor unit
PCB.
NO
External factor
(Noise, etc.)
262
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective outdoor inverter PCB
Defective IPM
Defective Current sensor
Defective IGBT or drive circuit
263
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Does it YES
return normally? External factors
(Noise, etc.)
NO
CHECK 16 NO
Is the power transistor
normal?
YES Check if
the insulation
resistance of the NO
Replace the
compressor is more compressor and
than 100k. the inverter PCB
for the
compressor at
YES the same time.
Replace the
inverter PCB.
CHECK 16 NO
Is the power transistor Replace the
for the fan driver inverter PCB for
normal? the compressor
and the fan
YES inverter PCB.
Replace the
inverter PCB.
264
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
External factor (Noise, etc.)
Defective outdoor unit fan motor
Broken fuse
Disconnection of compressor
Defective outdoor unit PCB
Defective IPM
Defective Current sensor
Defective MP-PAM
Defective IGBT or drive circuit
Defective inverter E2PROM
265
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
power supply NO
voltage between 180 Request an
and 220 VAC? improvement to
make the power
supply voltage
YES fall within the
standard range.
Turn OFF the power
supply, and remove the
connector for fan motor,
and then operate again.
Error is NO
displayed again? Replace the fan
motor.
YES
CHECK 1
Check the resistance
value for the fan motor.
Is the
resistance value NO
of the fan motor Replace the fan
normal? motor.
YES
Does the NO
fuse have continuity? Replace the fuse.
Use only
specified fuses.
YES
Is the
lead wire
connected to the NO
PCB and the Connect
compressor securely.
securely?
YES
266
Troubleshooting by Remote Controller Si20-701_B
Error is YES
displayed again? Replace the
outdoor unit
PCB.
NO
External factor
(Noise, etc.)
267
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Activation of fin thermal switch
Defective radiation fin thermistor
High outdoor air temperature
Insufficient cooling of inverter radiation fin
Blocked suction opening
Dirty radiation fin
Defective outdoor unit PCB
268
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Could
problem be
caused by high YES
radiation fin Correct the
temperature? problem.
(1)
NO
Do
LEDs on
outdoor unit PCB NO
indicate radiation fin Inspect outdoor
temperature unit PCB and
abnormality? remote controller.
YES
Is NO
reset possible? Check remote
controller
indication.
YES See the
troubleshooting
Reset "P4".
Note:
1. Fin temperature detection values
Model Detection Reset
RZ(Y)71L 85.5C 80.5C
RZY100~125L 85.0C 80.0C
269
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective radiation fin thermistor
High outdoor air temperature
Blocked suction opening
Dirty radiation fin
Defective outdoor inverter PCB
Activation of fin thermal switch (For RZQ-K, RZQ(S)-
B/C, RZQG, RZR-KU/HU)
Insufficient cooling of inverter radiation fin (For RZQ-K,
RZQ(S)-B/C, RZQG, RZR-KU/HU)
Defective propeller fan (For RZR-KUV2S)
270
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Can it be
considered that
the radiation fin YES
Eliminate the
temperature was cause.
high? (1)
NO
Is the
connector of
the radiation fin NO
thermistor correctly Connect
connected to the correctly.
outdoor unit
PCB? (1)
YES RZQ(S)-C
B
Is the error
"P4" displayed on YES
Go to
the remote troubleshooting
controller? "P4".
NO
A
271
Si20-701_B Troubleshooting by Remote Controller
Note:
1. Radiation fin temperature detection value
Model Detection Reset
RZQ
76C 66C
RZQ100~140B8W1B
RZR71KUV1
RZQ71B9V3B
RZQS71100B7V3B 87C 77C
RZQ71C7V1B
RZQS71100C7V1B
RZQG71LV1B 85C 75C
RZR100~140KUV1
RZR100~140HUY1
RZR-KUV2S
88C 78C
RZR-HUY2S
RZQ100~140C7V1B
RZQS125140C7V1B
RZQG100~140LV1B 89C 79C
Is the error
displayed again YES
when the unit starts Replace the
operation? outdoor unit
inverter PCB.
NO
Continue the
operation.
Is it NO
normally? Go to
troubleshooting
"P4".
YES
A
272
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Actuation of fin thermal (Actuates above 93C)
Defective inverter PCB
Defective radiation fin thermistor
273
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Radiation fin
temperature of the YES
Defective
compressor inverter If the radiation fin from
Power is high. radiation fin the switch box:
reaches a Conduct the
OFF temperature checks shown
of 93C, the below.
error will Radiation fin
NO occur. for stains
Airflow for
Remove and insert the interference
radiation fin thermistor Fan propeller
connector "X111A". for damage
Whether or not
outdoor air
Turn temperature is
ON the power too high
Power supply, and then YES
Replace the
ON check whether or not
the error recurs. inverter PCB.
NO End of measures
It is supposed
that radiation
fin temperature
has risen due
to onsite
causes.
Conduct the
checks shown
below.
Radiation fin for
stains
Airflow for
interference
Fan propeller
for damage
Whether or not
outdoor air
temperature is
too high
274
Troubleshooting by Remote Controller Si20-701_B
275
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Activation of fin thermal switch (93C or more)
Defective outdoor unit inverter PCB
Defective radiation fin thermistor
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
The
temperature
YES
of the radiation fin Defective
increased up to radiation of the
93C. power unit
The air-intake is
NO closed.
Dirt of the
Turn the power off to radiation fin
measure the resistance The outdoor air
value of the radiator fin temperature is
thermistor. high.
Is the
resistance
value of the thermistor NO
Replace the
normal? thermistor.
YES
276
Troubleshooting by Remote Controller Si20-701_B
Supply
power and start YES
operation to check if the Replace the
error occurs inverter PCB.
again.
NO
Continue
operation
There is a
possibility of
high
temperature of
the radiation fin
caused by any
field factors.
Check the
following items.
Dirt of the
radiation fin
The flow of the
air is blocked
(due to any dirt
or foreign
substances).
Fan propeller is
damaged.
The outdoor
temperature is
too high.
277
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective compressor coil (open circuit, defective
insulation)
Defective compressor startup (seizing)
Defective inverter
Defective outdoor unit PCB
Momentary disturbance in supply voltage
278
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Do
LEDs on
outdoor unit PCB NO
Inspect indoor
indicate DC output unit PCB and
overcurrent? remote controller.
(1)
YES
Is
the unit
inoperable YES
using remote
controller?
Disconnect compressor
inverter.
The NO
error is displayed Inspect
NO again. compressor for
short circuit and
Disconnect compressor YES ground fault.
inverter.
Check
compressor OK
for short circuit and Defective
ground fault. inverter.
NG
Defective inverter
and compressor.
A
Note:
1. Guideline values
Model Instantaneous overcurrent detection value
RZ(Y)71~125L 65A
279
Si20-701_B Troubleshooting by Remote Controller
Is
inverter
output voltage YES
Inspect
same in all 3 (Note) Within 5% compressor.
phases? between phases U and V,
between V and W and
NO between W and U.
Check NG
main circuit parts. Correct the
wiring. Defective
main circuit
OK parts.
Defective
inverter.
Note:
If an overcurrent results during motor pre-heating, reset
by remote controller may not be possible.
280
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective compressor coil (disconnection, poor
insulation)
Compressor startup error (mechanical lock)
Defective inverter PCB
Instantaneous power failure
Lightning surge
281
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
the stop valve NO
Open the stop
open? valve
YES
Is
the lead NO
wire of the compressor Replace the lead
normal? wire of the
compressor.
YES
Are
the wiring and
wiring connection to the NO
Correct the
compressor wiring and wiring
normal? connection.
YES
Power
OFF The
insulation
resistance is low YES
(i.e., not more than Replace the
100 k.) inverter
compressor.
NO
The
compressor coil YES
is shorted or Replace the
broken. inverter
compressor.
NO
CHECK 6 YES
Is continuity of the Replace the
power transistor outdoor unit PCB
normal? (A3P).
NO
A
282
Troubleshooting by Remote Controller Si20-701_B
Restart the
compressor, and NO
then check whether Continues
or not the error operation
( )
recurs. There may have
been
momentary
YES power failure
Power and others
Replace the PCB (A3P).
OFF
Restart the
compressor, and NO
then check whether or Continue the
not the error operation
recurs.
YES
Replace the
inverter
compressor.
283
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective compressor (mechanical lock, poor
insulation)
Defective inverter PCB
Instantaneous fluctuation of power supply voltage
Defective compressor (if bearing is scratched)
Stop valve is not opened
284
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Check the installation
conditions.
Is NO
the stop valve Open the stop
open? valve.
YES
The
compressor is YES
grounded and short Replace the
circuited. compressor.
NO
CHECK 4
Continuity check NO
in the power transistor Replace the
(IGBT). Is the outdoor unit
continuity PCB.
normal?
YES
Turn the power ON, and
then operate the test
operation.
Error is NO
displayed again?
YES Continue NO
the operation Go to the other
normally. troubleshooting.
285
Si20-701_B Troubleshooting by Remote Controller
Is
instantaneous YES
voltage drop Correct the
generated? power supply.
NO
Compressor
inspection.
Inspect
according to the
diagnosis
procedure for
abnormal noise,
vibration,
operating status,
etc. of the
compressor.
286
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective compressor coil (disconnected, defective
insulation)
Compressor startup error (mechanical lock)
Defective inverter PCB
Troubleshooting
Compressor inspection
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
valve open? Onsite causes.
Open the stop
YES valve.
Check the compressor
cable for disconnection
Power and flaws.
OFF
The
compressor cable YES
Replace the
has a defect. cable, and then
securely
NO connect the
A connectors.
287
Si20-701_B Troubleshooting by Remote Controller
The
insulation
Power resistance is low (i.e., YES
Replace the
OFF not more than compressor.
100k.)
NO
Check the compressor
motor coil for any broken
wire.
NO
Check the power
transistor on the inverter
PCB using a multiple
tester.
CHECK 16
The
power YES
transistor has an Replace the
abnormality. inverter PCB
(A3P).
NO
Make wire connections
according to the Wiring
Diagram.
288
Troubleshooting by Remote Controller Si20-701_B
Restart the
Power compressor, NO
ON and then check Normal
whether or not the Onsite causes
error recurs. such as
instantaneous
power failure or
YES open phase
Power Conduct
Replace the inverter PCB. checks and
OFF diagnosis of
the
compressor.
Restart the
compressor, and then NO
Power check whether or not the End of work
ON error recurs.
YES
Replace the
compressor.
Conduct
checks and
diagnosis of
the
compressor.
289
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective compressor coil (disconnection, poor
insulation)
Compressor startup error (mechanical lock)
Defective inverter PCB
Instantaneous fluctuation of power supply voltage
Defective compressor (if bearing is scratched)
The stop valve is not opened
290
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
valve open? Open the stop
valve.
YES
Is the
compressor YES
coil disconnected or Replace the
is the insulation compressor.
defective?
NO
CHECK 4
Continuity NO
check in the power Replace the
transistor (IGBT). Is outdoor unit
the continuity PCB.
normal?
YES
291
Si20-701_B Troubleshooting by Remote Controller
Is the
inverter
output voltage
generated
approximately at the NO
same increasing speed Replace the
for each phase after outdoor unit
turning ON PCB.
again? (1)
(U-V, V-W,
W-U)
YES
Check the power supply
voltage.
Is
instantaneous YES
voltage drop Correct the
generated? power supply.
NO
Compressor
inspection.
Inspect according
to the diagnosis
procedure for
abnormal noise,
vibration,
operating status,
etc. of the
compressor.
292
Troubleshooting by Remote Controller Si20-701_B
Note:
1. Approximate value
When operating compressor with compressor output line
disconnected, the compressor stops due to error after
elapsed time of 5 seconds. Therefore, check the voltage
increase for 5 seconds.
Model Instantaneous overcurrent detection value
RZQ71K, RZR71K
RZQ71B9V3B
RZQS71100B7V3B 32.0A
RZQ71C7V1B
RZQS71100C7V1B
RZQ100-160H
32.3A
RZQ100-140B8W1B
RZR100-140HUY1
RZR-KUV2S
RZR-HUY2S 51.7A
RZQ100-140C7V1B
RZQS125140C7V1B
293
Si20-701_B Troubleshooting by Remote Controller
Applicable Models
RZ(Y)
Supposed Causes
Compressor overload (in operation)
Open circuit in compressor coil
Defective outdoor unit PCB
Defective inverter
294
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
secondary
current of inverter YES
A (see list below) in Compressor
each phase? overload.
(1) Inspect
compressor and
(Note) Measure current refrigerant
in U, V and W within 30 NO system.
seconds using clamp
meter.
Disconnect compressor
inverter.
Is
inverter
output voltage YES
Inspect
same in all 3 compressor.
phases?
(Note) Within 5% NO
between phases U and
V, between V and W
and between W and U.
Check NG
main circuit parts. Correct the
wiring.
Defective main
(Note) Check for circuit parts.
element cracking, loose OK
Defective
connections, connector inverter.
disconnection and
damaged parts.
Note:
1. Electronic thermal switch detecting value
Model Cool/Heat 2 Detection Value
RZY71L Cool 20.5~22.0A
Heat 24.0A
RZY100L Cool 20.1~23.0A
Heat 21.8~23.0A
RZY125L Cool 21.0~23.7A
Heat 21.3~23.7A
295
Si20-701_B Troubleshooting by Remote Controller
Note:
2. Detecting values vary according to operating
frequency.
Detecting value decrease 10% for each HPS
activation.
296
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Compressor overload
Compressor coil disconnected
Defective inverter PCB
Defective compressor
297
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Output current check
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
A
current
Power of not less than YES
15A flows through the Overcurrent:
ON compressor. Check the
compressor and
refrigerant
NO system (in the
same manner as
Is NO that for E3).
the stop valve Open the stop
open? valve.
YES
Are wire
connections
properly made NO
(according to the Rectify the wire
Check the connections.
Wiring
Diagram)? compressor
cable for any
Power disconnection
OFF YES or flaws.
Disconnect the cable from
the compressor, and then
check the compressor for
the insulation resistance.
The
insulation YES
resistance is low, i.e., Replace the
not more than compressor.
100k.)
NO
A
298
Troubleshooting by Remote Controller Si20-701_B
Does
the power YES
transistor have any Replace the
abnormalities? inverter PCB.
The inverter is
likely to have
NO got defective
due to the error
of the
Connect the compressor compressor.
cable, and then restart the After the
operation. completion of
replacement,
be sure to
check the
compressor.
Is a
difference
between high
pressure and low NO
Defective
pressure prior to pressure
startup equalization:
0.2MPa? Check the
refrigerant
YES system.
The error NO
Power is displayed again. End of
It can take a measures:
ON maximum of Check the
YES 60 minutes to refrigerant
determine the system.
error.
Check of
compressor:
Check the
compressor for
abnormal
sounds,
vibration,
operating
conditions, and
others according
to the
Compressor
Diagnosis
Procedure.
299
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Compressor overload
Compressor coil disconnected
Defective inverter PCB
Disconnection of compressor
300
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Output current check
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is NO
the stop valve Open the stop
open? valve.
YES
Check if the NO
compressor lead wires Replace the
are normal. compressor lead
wires.
YES
Check
if the wiring NO
and connection to the Correct the
compressor are wiring and
normal. connection.
YES
Power OFF
Insulation
resistance of YES
the compressor is Replace the
100 k or inverter
below. compressor.
NO
Compressor YES
coils are disconnected. Replace the
inverter
compressor.
NO
CHECK 16
NO
Check if the power Replace the
transistor is inverter PCB.
normal.
YES
Connect the compressor
lead wires then restart
the operation.
301
Si20-701_B Troubleshooting by Remote Controller
Error
code L8 is NO
displayed again. Continue the
operation.
YES
Check if
the pressure
difference between
high pressure and low NO
Defective
pressure before pressure
restarting is equalizing in the
0.2MPa or refrigerant circuit.
below.
YES
Inspection of the
compressor.
302
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Disconnected compressor coil
High pressure is abnormal high
Defective compressor (if bearing is scratched)
Defective outdoor unit PCB
Stop valve is not opened
303
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
secondary
current of the YES
inverter higher than A
(*1) for each
phase?
Is the
NO
stop valve Open the stop
NO opened? valve.
YES
CHECK 4 YES
High pressure is high. Remedy the
cause.
Check for
Turn OFF the power excessive
supply. NO refrigerant
charging.
CHECK 10
Replace the
outdoor unit
CHECK 6 PCB.
Continuity
check in the NO
power transistor Replace the
(IGBT). Is the outdoor unit
continuity PCB.
normal?
YES
Compressor
inspection.
Inspect
according to the
diagnosis
procedure for
abnormal noises,
vibration,
operating status,
etc. of the
compressor.
304
Troubleshooting by Remote Controller Si20-701_B
Note:
1 Secondary electronic thermal detection value
Model Detection value
Cooling 12.6 or 12.2A 260 seconds
RZQG71
Heating 14.8A 260 seconds
Cooling 16.1A 260 seconds
RZQG100-140
Heating 22.1A 260 seconds
305
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Compressor overload (during operation)
Disconnected compressor coil
Defective inverter
Defective compressor (if bearing is scratched)
Defective outdoor unit PCB
306
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
secondary
current of the YES
inverter higher than Compressor
A (1) for each overload.
phase? Inspection of the
compressor and
refrigerant
NO system is
required.
Turn the main power
supply OFF, and then
disconnect the connection
between the compressor
and inverter.
Note:
1. Electronic thermal detection value
Model Detection value
RZQ Cooling 17A 5 seconds or 12.1A 260 seconds
RZQ100-140B8W1B Heating 17A 5 seconds or 14.1A 260 seconds
RZQ71B9V3B Cooling
17A 5 seconds or 14.8A 260 seconds
RZQS71 100B7V3B Heating
RZQ71C7V1B Cooling 13.8A 260 seconds
RZQS71 100C7V1B Heating 14.8A 260 seconds
RZQ100 140C7V1B Cooling
31A 5 seconds or 21.1A 260 seconds
RZQS125 140C7V1B Heating
307
Si20-701_B Troubleshooting by Remote Controller
CHECK 4
Continuity check NO
in the power transistor Replace the
(IGBT). Is the outdoor unit
continuity PCB.
normal?
YES
Is the
inverter
output voltage
generated
approximately at the NO
same increasing speed Replace the
on each phase after outdoor unit
turning ON PCB.
again? (1)
(U-V, V-
W, W-
U)
YES
Compressor
inspection.
Inspect
according to the
diagnosis
procedure for
abnormal noises,
vibration,
operating status,
etc. of the
compressor.
Note:
1. When operating compressor with compressor output
line disconnected, the compressor stops due to error
after elapsed time of 5 seconds. Therefore, check the
voltage increase for 5 seconds.
308
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective compressor (seizing)
Pressure difference during startup
Defective inverter
Defective outdoor unit PCB
309
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
difference
between high and NO
Defective
low pressure levels pressure
less than 0.2 equalization.
MPa? Inspect
refrigerant
YES system.
Is
secondary
current of inverter YES
Compressor
A (1) in each seizing.
phase? Inspect
(Note) Measure current compressor and
in U, V and W within 30 NO refrigerant
seconds using clamp system.
meter.
Disconnect compressor
inverter.
Is
inverter
output voltage YES
Inspect
same in all 3 compressor.
phases?
(Note) Within 5% NO
between phases U and
V, between V and W
and between W and U.
Check NG
main circuit parts. Correct the
wiring.
Defective main
(Note) Check for OK circuit parts.
element cracking, loose Defective inverter
connections, connector
disconnection and
damaged parts.
Note:
1. Guideline values
Model Instantaneous overcurrent detection value
RZ(Y)71~125L 24.0A
310
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective compressor
The stop valve is not opened
Pressure differential start
Defective compressor connection
Defective inverter PCB
311
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
valve open? Open the stop
valve.
YES
Are wire
connections
properly made NO
(according to the Rectify the wire
Wiring Check the connections.
Diagram)? compressor
cable for any
disconnection
YES or flaws.
Disconnect the cable from
the compressor, and then
check the compressor for
the insulation resistance.
Power
The
OFF insulation YES
resistance is low (i.e., Replace the
not more than compressor.
100k.)
NO
Check the power
transistor on the inverter
PCB using a multiple
tester.
Does
the power YES
transistor have any Replace the
abnormalities? inverter PCB.
The inverter is
likely to have
NO got defective
due to the error
Connect the compressor of the
cable, and then restart compressor.
the operation. After the
completion of
replacement,
A be sure to
check the
compressor.
312
Troubleshooting by Remote Controller Si20-701_B
Is a
difference
between high
pressure and low NO
Defective
pressure prior to pressure
startup equalization:
0.2MPa? Check the
refrigerant
YES system.
NO
error End of
It can take a measures:
Power YES maximum of Check the
ON 60 minutes to refrigerant
determine the system.
error.
Check of
compressor:
Check the
compressor for
abnormal
sounds,
vibration,
operating
conditions, and
others according
to the
Compressor
Diagnosis
Procedure.
313
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
The stop valve is not opened
Pressure differential startup
Defective outdoor unit inverter PCB
Defective compressor (lock)
314
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
Open the stop
valve open? valve.
YES
Is the
difference
between high and NO
low pressure before Insufficient
startup not more pressure
than 0.2MPa? equalization.
Check refrigerant
system.
YES
CHECK 4
Continuity check NO
in the power transistor Replace the
(IGBT). Is the outdoor unit
continuity PCB.
normal?
YES
315
Si20-701_B Troubleshooting by Remote Controller
A
RZQ-K, RZQ(S)-B/C
RZQ-H, RZQG
The
compressor is YES
grounded and short- Replace the
circuited. compressor.
NO
Compressor
inspection.
Inspect
according to the
diagnosis
procedure for
abnormal noises,
vibration,
operating status,
etc. of the
compressor.
Is the
inverter
output voltage
generated
approximately at the NO
same increasing speed Replace the
on each phase after outdoor unit
turning ON again? PCB.
(1) (U-V, V-
W, W-U)
YES
Compressor
inspection.
Inspect
according to the
diagnosis
procedure for
abnormal noises,
vibration,
operating status,
etc. of the
compressor.
Note:
1. When operating compressor with compressor output
line disconnected, the compressor stops due to error
after elapsed time of 5 seconds. Therefore, check the
voltage increase for 5 seconds.
316
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Connection error between the inverter PCB and
outdoor control PCB
Defective outdoor control PCB (transmission section)
Defective inverter PCB
Defective noise filter
Defective fan inverter
Incorrect type of fan inverter
Defective compressor
Defective fan motor
Address conflict on inverter PCB
317
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are
the fan
transmission wire NO
connectors wrongly Connect the
connected? connectors to the
corresponding
color (black or
YES yellow).
Power
ON Check
whether or not
the power supply NO
voltage between L2 and N Onsite cause.
falls in the range of Correct the
220 to wiring.
240VAC?
YES
Is the type NO
(PC No.) of the fan Mount the
inverter correct? correct type of
fan inverter.
YES
Is the
PCB address of NO
the compressor inverter Mount the
correct? correct type of
compressor
inverter.
YES
Disconnect the cable from
the compressor, and then
Power check the compressor for
the insulation resistance.
OFF
The
insulation YES
resistance is low (i.e., not Replace the
more than compressor.
100k.)
NO
A
318
Troubleshooting by Remote Controller Si20-701_B
The
insulation YES
resistance is low (i.e., not Replace the fan
more than motor.
1M.) Replace the fan
driver PCB.
NO
Power Check for connector connections: Remove
OFF and insert the connectors shown below.
<Example> CMSQ-A7
[Fan 1]
A1P X28A X6A A3P
A1P X20A X4A A3P
A3P X61A X402A A2P
A3P X1A X403A A2P
A3P X5A X5A A4P
A3P X41A X3A A4P
A4P X4A Short connector
Note) X3A: black
X4A: yellow
F400U YES
of the A2P has
been molten.
Replace the noise
NO filter of the A2P.
B
F400U
CMSQ-A7
319
Si20-701_B Troubleshooting by Remote Controller
Is the
micro controller NO
normal monitor (green) This is not LC.
of the PCB Recheck for the
blinking? error code.
Check 10 or more
YES seconds after the
power supply is
The turned ON.
fan driver YES
Replace the
PCB do not blink. inverter PCB.
Power If the PCB
ON NO replaced is
badly
damaged, the
compressor is
likely to get
defective. To
make sure,
recheck the
compressor.
The fan YES
driver PCB does Replace the fan
not blink. driver PCB.
NO
320
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective outdoor unit fan motor
Defective fan motor connector contact
Defective control and inverter PCB
External factor (Noise, etc.)
321
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
the fan NO
motor connector Connect the
connected? connector.
YES
Disconnect the fan motor
connector, and turn ON
again.
E7 is
displayed? (LC is YES
Replace the fan
not displayed?) motor.
Inverter
transmission
NO defective due
to the error of
fan motor.
Replace the
outdoor unit PCB .
322
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Incorrect transmission wiring between control PCB
and inverter PCB/insufficient contact in wiring
Defective control PCB and inverter PCB
External factor (Noise, etc.)
Defective outdoor unit fan motor
Defective fan motor connector contact
323
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the fan NO
motor connector Connect the
connected? connector, and
turn ON again.
YES
Are
connectors
connecting the
control PCB and NO
Connect the
inverter PCB transmission
connected wiring, and turn
securely? ON again.
YES
Is the
transmission
wiring between the YES
control PCB and Fix the
inverter PCB disconnection,
disconnected? and turn ON
again.
NO
Is E7
displayed on the YES
remote controller? Replace the fan
(Is LC not motor.
displayed?) Inverter
transmission
NO defective due to
the error of fan
A motor.
324
Troubleshooting by Remote Controller Si20-701_B
Is the
micro-
computer normal NO
monitor (green) on Replace the
inverter PCB outdoor unit
blinking? PCB.
YES
RZQ-K
RZQ-H, RZQ(S)-B/C, RZR
Is the
micro-
computer normal NO
Replace the
LED on control PCB outdoor unit
blinking? PCB.
YES
Check for
defective
connector
connection in the
transmission
wiring and for
clamps with high
tension line.
325
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Open phase
Voltage imbalance between phases
Defective main circuit capacitor
Defective inverter PCB
Defective K2 relay in inverter PCB
Improper main circuit wiring
326
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Imbalance in YES
supplied voltage is in
excess of 14 V.
(1) YES
Open phase? Open phase
NO Normalize the
field cause.
NO
Fix the power
Is the supply voltage
voltage imbalance.
imbalance applied to YES
the inverter in excess Part or wiring
of 14 V? (2) defect
After turning the
power supply
OFF, check and
NO repair the main
circuit wiring or
parts.
(1) Loose or
disconnected
wiring
A between
power supply
and inverter
(2) K2 contact
disposition,
fusion or
contact is
poor.
(3) Loose or
disconnected
noise filter
327
Si20-701_B Troubleshooting by Remote Controller
328
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Open phase
Voltage imbalance between phases
Defective outdoor inverter PCB
Defective main circuit capacitor
Power unit (Disconnection in diode module)
Defective magnetic relay
Improper main circuit wiring
329
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Check LED on NO
the outdoor unit PCB External factor.
(Open phase?)
YES
NO
Is the
voltage
imbalance NO
Field factors.
between phases
large? (1)
YES
Replace the
outdoor inverter
PCB.
Note:
1. Target : 10V between phases, R-S, S-T, T-R
330
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective thermistor
Defective outdoor unit PCB
331
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
radiation fin NO
thermistor External factor.
defective?
YES
Disconnect connector
from the outdoor unit
PCB, and check
resistance of temperature
thermistor at normal
temperature.
Is it
normal? NO
Replace the
CHECK 3 thermistor.
YES
Is reset NO
possible? Defective
inverter
YES
Reset
332
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective radiation fin temperature thermistor
Defective inverter PCB
333
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Disconnect the cable from
Power the compressor, and then
check the compressor for
OFF the insulation resistance.
The
insulation YES
resistance is low (i.e., Replace the
not more than compressor.
100k.)
NO
Disconnect the cable from
the fan, and then check
the fan motor for the
insulation resistance.
The
insulation YES
resistance is low (i.e., Replace the fan
not more than motor.
1M.) Replace the fan
driver PCB.
NO
Remove and insert the fin
thermistor connector
Turn ON
Power the power supply, YES
and then check whether Replace the
ON or not the error inverter PCB.
recurs.
NO
End
334
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective radiation fin thermistor
Defective outdoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
CHECK 1 NO
Replace the
Normal? outdoor unit
inverter PCB.
YES
Is reset NO
possible? Replace the
outdoor unit
YES inverter PCB.
Reset.
335
Si20-701_B Troubleshooting by Remote Controller
Possible Causes
Improper set value with E2PROM
Improper capacity setting adaptor installed
Defective outdoor unit PCB
336
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
the
capacity setting NO
adaptor connected to Connect an
the outdoor unit adaptor suitable
PCB? (1) for the applicable
model.
YES
Check whether the
combination of the
capacity setting adaptor Correct the
installed is correct for the combination if
PCB. wrong.
Note:
1. The capacity setting adaptor is not connected at the
time of shipment from factory. (The capacity is written
in the E2PROM.)
This capacity setting adaptor is required only when
the PCB is replaced with a spare PCB.
337
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Inappropriate capacity setting adaptor
Defective outdoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
capacity
setting adaptor NO
connected to outdoor Connect adaptor
unit PCB? appropriate to
the model.
YES
Check the combination of
capacity setting adaptor Correct the
and outdoor unit PCB. combination if it
is incorrect.
338
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective (or no) field setting after replacing main PCB
Mis-matching of type of PCB
339
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Has the NO
PCB been
replaced?
YES
When
replacing the NO
main PCB, were field Correct the field
setting properly settings.
made?
YES
Is
the type of NO
Replace with a
PCB correct? correct PCB.
YES
Reset, and then
restart.
340
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Mismatch of the PCB types
Field setting error
341
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
the type of the NO
compressor inverter Replace with the
PCB correct? correct
compressor
YES inverter PCB.
Is the
type of the fan NO
inverter PCB Replace with the
correct? correct fan
inverter PCB.
YES
Was
the dip switch
correctly set up NO
Correctly set up
when replacing the the DIP switch.
main PCB?
YES
Is the
lamp in
preparation (H2P) on NO
Correct the
the main PCB turned connection wires.
OFF?
YES
Replace the
outdoor unit main
PCB.
342
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Improper set value of E2PROM
Improper capacity setting adaptor
Mismatching of type of PCB
343
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
NO
Is the type NO
of PCB correct? Replace with a
correct PCB.
YES
Is the
correct
capacity setting NO
adaptor connected to the Mount the correct
outdoor unit PCB? capacity setting
() adaptor correctly.
YES
Reset, and then
restart.
Note:
Capacity setting adaptor is not connected at factory.
(Capacity is written in E2PROM.) Capacity setting
adaptor is required only when the PCB was replaced
with a spare PCB.
344
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Improper set value of E2PROM
Improper capacity setting adaptor
Defective outdoor unit PCB
345
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
capacity setting NO
adaptor connected to Connect the
outdoor unit adaptor for the
PCB? (1) applicable model.
YES
Note:
1. Capacity setting adaptor is not connected at factory.
(Capacity is written in E2PROM.) Capacity setting
adaptor is required only when the PCB was replaced
with a spare PCB.
346
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Refrigerant shortage
Refrigerant piping circuit clogging
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
amount of NO
refrigerant correct? Charge with the
proper amount of
refrigerant.
YES
Check the
refrigerant piping
circuit for
clogging.
347
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Refrigerant shortage
Clogged refrigerant piping system (1)
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
amount of NO
refrigerant Charge correct
appropriate? amount of
refrigerant.
YES
Check clogging
of refrigerant
piping system. ( 1)
Note:
1. Check point:
1. Refrigerant filter clogging
2. Electronic expansion valve operation
3. Check valve operation
4. Defective thermistor
348
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Refrigerant shortage or refrigerant system clogging
(incorrect piping)
Defective low pressure sensor
Defective outdoor unit PCB (A1P)
Defective thermistor R7T or R4T
349
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
YES
Cooling
NO Low
pressure is 0.1 YES
Refrigerant
MPa or less. shortage, closing
of stop valve or
NO refrigerant
system is
clogged.
Requires check
of refrigerant
The system.
voltage
of X31A pins
(2) and (3) on
outdoor unit main PCB YES
(A1P) is 0.8 VDC or less. Replace the
(Low pressure sensor outdoor unit main
output voltage) PCB (A1P).
CHECK 7
NO
Replace the low
Difference pressure sensor.
between suction
pipe and outdoor unit YES
Refrigerant
heat exchanger shortage or
temperature is refrigerant
20C or system is
higher. clogged.
Requires check
NO of refrigerant
350
Troubleshooting by Remote Controller Si20-701_B
Resistance
is normal when
measured with the
suction pipe
thermistor (R7T) and coil NO
thermistor (R4T) Replace the
disconnected from thermistor.
the outdoor unit
PCB.
CHECK 3
YES
Replace the
outdoor unit PCB
(A1P).
351
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
The stop valve is not opened
Insufficient refrigerant amount
Clogged refrigerant piping system
352
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the stop NO
valve open? Open the stop
valve.
YES
Is the
refrigerant NO
amount appropriate? Collect
refrigerant.
After vacuum
drying is
YES complete, charge
an appropriate
amount of
refrigerant.
CHECK 10
Check the
refrigerant piping
system for
clogging.
CHECK 11
353
Si20-701_B Troubleshooting by Remote Controller
354
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Refrigerant shortage
Clogged refrigerant piping system
Mismatching of wiring and piping
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
CHECK 12
Check for refrigerant
shortage.
Is the NO
refrigerant Collect
level proper? refrigerant and
recharge a
proper amount of
YES refrigerant after
vacuum drying.
Check the transmission
wiring and piping between
the indoor and outdoor
units.
Is
wiring and NO
piping connection Match wiring and
matched? piping
connection.
YES
Check the
refrigerant piping
system for
clogging.
CHECK 11
355
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Refrigerant shortage
Clogged refrigerant piping system
Mismatching of wiring and piping
356
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the NO
refrigerant level Collect
proper? refrigerant and
recharge a
YES proper amount of
refrigerant after
Check the transmission vacuum drying.
wiring and piping
between the indoor and
outdoor units.
Is
wiring and NO
piping connection Match wiring and
matched? piping
connection.
YES
Check the
refrigerant piping
system for
clogging.
CHECK 11
357
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective power supply wiring connection
Power supply wiring is broken or disconnected.
Defective outdoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
The error is NO
displayed again. External factor
(Noise, etc.)
YES
Replace the
outdoor unit
PCB.
358
Troubleshooting by Remote Controller Si20-701_B
Possible Causes
Defective connection of power supply wiring
Disconnection in power supply wiring
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Error is NO
displayed again. External factor
(Noise, etc.)
YES
Are the
phases of circuit YES
Interchange the
breaker matched? power supply
cables.
NO
Does
imbalance in YES
the power supply Check for the
voltage occur? power supply
(10%) facilities.
NO
Replace the
outdoor unit
PCB.
359
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Power supply reverse phase
Power supply open phase
Defective outdoor unit PCB (A1P)
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
There
is an open
phase at the power YES
supply terminal section Fix the open
(X1M) of the phase. Requires
outdoor inspection of
unit. field power
supply section.
NO
Operation is
normal if one YES
place of power supply Reverse phase
line phase is Counter
measure of the
replaced. problem is
completed by
phase
replacement.
NO
Replace the
outdoor unit PCB
(A1P).
360
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Supply voltage drop (lower than 198 V)
Momentary power failure
Open phase
Defective K1M
Defective contact or open circuit in X51A
Defective wiring in main circuit
Defective outdoor unit PCB
Damaged main circuit parts
361
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Check
LED indication NO
on outdoor unit PCB. External factor
(Is voltage too
low?)
YES
Is
supply
voltage 220-240V NO
(RZ(Y)71LV1), 220V Local power
(RZY71 LVAL, supply condition
RZY100/125
LTAL)?
YES
NO
Does K1M turn ON?
YES Is K1M
coil applied
with 220-240V YES
(RZ(Y)71LV1), 220V Replace the K1M
(RZY71 LVAL, (1).
RZY100/125
With compressor in LTAL)?
operation, measure NO
voltage between P and N Replace the
(2) of power module or outdoor unit
between + and of PCB.
electrolytic capacitor.
Is measured YES
voltage 220 VDC Monitor voltage
or higher? (instantaneous
voltage drop).
NO
Replace the
outdoor unit
PCB.
Note:
1. K1M replacement possible in RZY100/125L.
2. For RZY71: Between terminals P1 and N1
For RZY100~125L: Between terminals P2 and N1
362
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Drop in power supply voltage (180 V or less)
Instantaneous power failure
Inverter open phase (Phase T)
Defective main circuit wiring
Defective outdoor unit inverter PCB
Main circuit parts damaged
363
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Check LED
on outdoor unit PCB. NO
(Is the voltage External factor
insufficient?)
YES
Is the
power supply NO
voltage between Field factors
20010% VAC?
YES
NO
Is the wiring correct? Correct the
wiring.
YES
When the compressor is
running, measure the
voltage between + and -
of electrolytic capacitor
(C+, C-).
Is the
measured voltage YES
Monitor the
220 VDC or voltage
more? (Instantaneous
voltage drop)
NO
Replace the
outdoor inverter
PCB.
364
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Power supply insufficient
Instantaneous power failure
Open phase
Defective inverter PCB
Defective outdoor control PCB
Main circuit wiring defect
Defective compressor
Defective fan motor
Defective connection of signal cable
365
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Check for
power supply
voltage. Voltage NO
between phases: 380 to On-site causes.
415V Phase Make proper
voltage: 220 wire connections
to 240V without open
phase,
erroneous
Power connections, or
YES
ON erroneous order
of phases.
Unbalanced
power supply? (Not NO
more than 2%: Phase On-site causes
voltage of not more Correct the
than approx. unbalanced
5V) loads to
eliminate the
unbalanced
YES state.
Disconnect the cable from Unbalanced
the compressor, and then voltage will
check the compressor for cause extremely
the insulation resistance. unbalanced
current, thus
NO impairing the
service life of or
resulting in the
error of the
The equipment.
Power insulation YES
resistance is low (i.e., Replace the
OFF not more than compressor .
100k.)
NO
Disconnect the cable from
the fan, and then check
the fan motor for the
insulation resistance.
NO
366
Troubleshooting by Remote Controller Si20-701_B
The
insulation YES
resistance is low (i.e., Replace the fan
not more than motor.
1M.) Replace the fan
driver.
NO
Check the inverter power
transistor.
367
Si20-701_B Troubleshooting by Remote Controller
Has
the inverter YES
PCB caused Replace the
damage? inverter PCB.
If the PCB
replaced is
NO badly
damaged, the
compressor is
likely to get
defective. To
make sure,
recheck the
Has the compressor.
fan driver caused YES
Replace the fan
damage? driver PCB.
If the PCB
replaced is
NO badly
damaged, the
fan motor is
likely to get
defective. To
C make sure,
recheck the
compressor.
368
Troubleshooting by Remote Controller Si20-701_B
Stop
(standby) YES
before the fan Recheck for the
rotates. power supply. If
there is no
NO problem with the
power supply,
replace the
noise filter PCB.
If the error
recurs, replace
the inverter
Stop PCB.
(standby) when YES
the compressor Recheck for the
starts up. power supply. If
Power there is no
ON problem with the
NO power supply,
replace the
inverter PCB.
If the PCB
replaced is
badly
damaged,
compressor is
likely to get
defective. To
make sure,
recheck the
compressor.
The YES
"U2" error Check the
recurs. harness, and
then replace it if
NO necessary.
End of
measures:
The error may
temporarily
result from on-
site causes.
Causes:
Instantaneous
power failure
(open phase),
noises, or else.
369
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Drop in power supply voltage
Defective outdoor unit fan motor
Instantaneous power failure
Defective outdoor unit inverter PCB
Main circuit parts damaged
370
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
power
supply voltage NO
Field factors
between 200
10% VAC?
YES
Remove the connector for
fan motor on the PCB,
and operate.
"U2" is NO
displayed?
YES
Is the fan
motor normal? NO
(Refer to Replace the fan
troubleshooting motor.
"E7" )
YES
CHECK 2
Is the resistance NO
Replace the fan
valve is above the motor.
criteria?
YES
Is the wiring NO
Correct the
correct? wiring.
YES
A
371
Si20-701_B Troubleshooting by Remote Controller
Is the
measured voltage YES
220 VDC or Monitor the
more? voltage
(Instantaneous
NO voltage drop)
Replace the
outdoor unit
PCB.
372
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Check operation is not executed.
373
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Has
the check
operation NO
performed on Press and hold
outdoor unit BS4 on the
PCB? outdoor unit main
PCB for 5
YES seconds or more,
or turn ON the
local setting
mode 2-3 to
conduct a check
operation.
Performs the
check operation
again and
completes the
check operation.
When a leakage
detection
function is
needed, normal
operation of
charging
refrigerant must
be completed.
And then, start
once again and
complete a check
operation.
374
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Wiring indoor-outdoor transmission wire is incorrect.
Defective indoor unit PCB
Defective outdoor unit PCB
External factor (Noise, etc.)
375
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Diagnosis of incorrect or broken/disconnected wiring
If the LEDs on the indoor unit PCB are OFF, it indicates
that the transmission wiring between indoor and outdoor
units may be incorrect or broken/disconnected.
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Check
of indoor unit
micro-computer NO (ON or OFF)
normal H1P. Is H1P
blinking?
Turn OFF the power
supply and turn the power
YES ON.
NO
Is H1P blinking? Replace the
indoor unit PCB
or correct power
YES supply system.
Resets normally.
External factor
Check (Noise, etc.).
of indoor unit NO
transmission error
H2P. Is H2P
blinking?
YES
Is H2P ON? Replace the
YES indoor unit PCB.
NO (OFF)
If outdoor unit micro-
computer normal H1P
blinks, it indicates
defective indoor unit PCB.
376
Troubleshooting by Remote Controller Si20-701_B
Check
of outdoor
unit micro-computer NO (ON or OFF)
normal H1P. Is H1P
blinking?
Turn OFF the power
supply and turn the power
YES ON.
YES
Is H1P blinking? Resets normally.
External factor
NO (Noise, etc.).
YES
Is H1P ON? Replace the
indoor unit PCB.
NO (OFF)
Turn OFF the power
supply, disconnect the
No.2 indoor-outdoor
transmission wire, and
turn power supply restart.
YES
Is H1P blinking? Replace the
indoor unit PCB.
NO
Replace the
indoor unit PCB
or correct power
supply system.
Check
of outdoor unit NO (ON)
error detection LED. Outdoor product
Is the red LED diagnosis
OFF?
YES
END
377
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Wiring indoor-outdoor transmission wire is incorrect.
Defective indoor unit PCB
Defective outdoor unit PCB
External factor (Noise, etc.)
Troubleshooting
Diagnosis of incorrect or broken/disconnected wiring
If the LEDs on the indoor unit PCB are OFF, it indicates
that the transmission wiring between
indoor and outdoor units may be incorrect or broken/
disconnected.
378
Troubleshooting by Remote Controller Si20-701_B
Check
of indoor unit
micro-computer NO (ON or OFF)
normal HAP. Is HAP
blinking?
NO
Is H1P blinking? Replace the
indoor unit PCB
or correct power
YES supply system.
Resets normally.
Check External factor
of indoor unit NO (Noise, etc.).
transmission error
HBP. Is HBP
blinking?
YES YES
Is H2P ON? Replace the
indoor unit PCB.
NO
Does
NO outdoor unit
micro-computer
normal H1P
blink?
YES
Is
indoor-
YES outdoor NO
transmission wire wired Wire correctly.
correctly?
A
379
Si20-701_B Troubleshooting by Remote Controller
Check of
outdoor unit NO (ON or OFF)
micro-computer normal
HAP. Is HAP
blinking?
YES
Is HAP blinking? External factor
(Noise, etc.).
NO
YES
Is HAP ON? Failure of
outdoor unit
NO (OFF) PCB.
YES
Is HAP blinking? Replace the
indoor unit PCB.
NO
Replace the
outdoor unit PCB
or correct power
supply system
YES
"U4" displays Replace the
constantly? indoor unit PCB
NO
Resets normally.
External factor
(Noise, etc.)
380
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Wiring indoor-outdoor transmission wire is incorrect.
Defective indoor unit PCB
Defective outdoor unit PCB
External factor (Noise, etc.)
Power supply -open phase
381
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Diagnosis of incorrect or broken/disconnected wiring
If the LEDs on the indoor unit PCB are OFF, it indicates
that the transmission wiring between indoor and outdoor
units may be incorrect or broken/disconnected.
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
NO (ON or OFF)
Is H1P blinking?
NO
Is H1P blinking? Defective indoor
unit PCB or error
of power supply
YES system.
Resets normally.
External factor
NO (Noise, etc.)
Is H2P blinking?
YES
YES
Is H2P ON? Replace the
indoor unit PCB.
NO (OFF)
Does
NO outdoor unit
micro-computer
normal H1P
blink?
YES
Is
transmission
YES wire between indoor NO
and outdoor unit Wire correctly.
wired correctly?
A
382
Troubleshooting by Remote Controller Si20-701_B
NO (ON or OFF)
Is H1P blinking?
YES
Is H1P blinking? Resets normally.
External factor
NO (Noise, etc.).
YES
Is H1P ON? Replace the
indoor unit PCB.
NO (OFF)
Turn OFF the power
supply, disconnect the
No.2 indoor-outdoor
transmission wire, and
turn power supply restart.
YES
Is H1P blinking? Replace the
indoor unit PCB.
NO
Replace the
outdoor unit PCB
or correct power
supply system.
Is the YES
error displayed Replace the
constantly? indoor unit PCB.
NO
Resets normal
External factor
(Noise, etc.)
383
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Wiring indoor-outdoor transmission wire is incorrect
Defective indoor unit PCB
Defective outdoor unit PCB
Burning out fuse
Defective fan motor
External factor (Noise, etc.)
Troubleshooting
Diagnosis of incorrect or broken/disconnected wiring. If
the LEDs on the indoor unit PCB are OFF, it indicates
that the transmission wiring between indoor and outdoor
units may be incorrect or broken/disconnected.
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
power supply NO
voltage 415 VAC Field factor
between terminal
L3 and N?
YES
Is
there a
wrong wiring
type, loose terminal NO
or contact failure in the Wire correctly
transmission wiring and securely
between the indoor fasten the
and outdoor terminal screws.
units?
YES
A
384
Troubleshooting by Remote Controller Si20-701_B
Is any
NO optional accessory
(1) connected?
YES
Is
the power
for the optional NO
accessory supplied Wire correctly.
from the correct
terminal?
YES
Is HAP
on the outdoor YES
unit PCB blinking? B
(Outdoor unit
PCB)
NO
Turn OFF the power
supply and disconnect the
connector of the outdoor
unit fan motor. Then
power ON again.
Note:
1. Optional accessories refer to wire adaptor, auto grill
and other accessories.
385
Si20-701_B Troubleshooting by Remote Controller
Is HAP YES
blinking? (Outdoor Replace the
unit PCB) outdoor unit fan
motor.
NO
Is the
resistance value NO
of the outdoor unit fan Replace the
motor normal? outdoor unit fan
motor.
YES
Does the NO
fuse have continuity? Replace the fuse.
YES
CHECK 13
Check the fan speed pulse.
Is the output NO
voltage normal? Replace the
outdoor unit
inverter PCB.
YES
After turning OFF the
power supply, correctly
insert the connector of the
fan motor and then restore
the power.
386
Troubleshooting by Remote Controller Si20-701_B
387
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Indoor to outdoor, outdoor to outdoor transmission
wiring F1, F2 disconnection, short circuit or wrong
wiring
Outdoor unit power supply is OFF
System address does not match
Defective indoor unit PCB
Defective outdoor unit PCB
388
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Has
the indoor
or outdoor unit
PCB been
replaced, or has the YES
indoor - outdoor or Press and hold
outdoor - outdoor the RESET
unit transmission button on the
wiring been master outdoor
modified? unit PCB for 5
seconds.
The unit will not
operate for up
NO to 12 minutes.
All
indoor unit
remote controllers NO
of the same refrigerant
system display
"U4". Is
indoor -
outdoor and
YES outdoor - outdoor unit YES
Replace the
transmission wiring indoor unit PCB
normal? indicated by the
Reset the power supply. error code "U4".
NO
Fix the
indoor/outdoor or
Outdoor unit outdoor/outdoor
PCB micro- NO unit transmission
computer monitor wiring.
(HAP) blinks.
The
voltage
YES between
terminals L1 and N of NO
A Supply
the outdoor unit PCB 220~240V.
is 220~240 V
10%.
YES
The
fuse on the YES
outdoor unit PCB is Replace the fuse.
burnt.
NO
Replace the
outdoor unit
PCB.
389
Si20-701_B Troubleshooting by Remote Controller
NO Operation
ready lamp (H2P) is
blinking.
YES
Lamp
does not go OFF for YES
Press and hold
12 minutes or the RESET
more. button on the
NO outdoor unit PCB
for 5 seconds.
Is
indoor -
outdoor and
outdoor - outdoor unit NO
Fix the
transmission wiring indoor/outdoor or
normal? outdoor/outdoor
unit transmission
wiring.
YES
Disconnect
the outdoor-
outdoor unit
transmission wiring, NO
and then check with a Replace the
single system outdoor unit PCB
whether or not (A1P).
it is
normal.
YES
Mount the DIII-
NET expander
adaptor.
390
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Wiring indoor-outdoor transmission wire is incorrect
Defective indoor unit PCB
Defective outdoor unit PCB
Burning out fuse
Defective fan motor
External factor (Noise, etc.)
391
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Diagnosis of incorrect or broken/disconnected wiring. If
the LEDs on the indoor unit PCB are OFF, it indicates
that the transmission wiring between indoor and outdoor
units may be incorrect or broken/disconnected.
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
power supply NO
voltage between 180 Field factor
and 220 VAC?
RZQ100~140C7V1B
RZQS125140C7V1B
RZQ100~140B8W1B YES
RZQ71B9V3B
RZQS71100 B7V3B
Is wire
connection
between the
control PCB (A1P)
and the inverter PCB NO
Connect
(A2P) securely correctly/Repair
connected without wire breaking.
wire breaking?
YES
Is
there
wrong
wiring, a wrong
wire type, loose
terminal or contact NO
failure in the Wire correctly
transmission wiring and securely
between the fasten the
indoor and terminal screws.
outdoor
units?
YES
A
392
Troubleshooting by Remote Controller Si20-701_B
Is any
NO optional
accessory (1)
connected?
YES
Is
the power
for the optional
accessory supplied NO
from between 1 and 2 Wire correctly.
on terminal
block
X2M?
YES
Is HAP
on the outdoor YES
unit PCB blinking? B
(Outdoor unit
PCB)
NO
Turn OFF the power
supply and disconnect the
connector of the outdoor
unit fan motor. Then
power ON again.
Is HAP YES
blinking? (Outdoor Replace the
unit PCB) outdoor unit fan
motor.
NO
Check the resistance
value of the outdoor unit
fan motor.
Is the
resistance NO
value of the outdoor Replace the
unit fan motor outdoor unit fan
normal? motor.
YES
C
393
Si20-701_B Troubleshooting by Remote Controller
Does the NO
fuse (2) have Replace the fuse.
continuity?
YES
CHECK 13 Check the
fan output voltage.
Is the NO
output voltage RZQ71B9,
normal? RZQS71100B
7 (1),
YES RZQ100~140B
8 (3):
After turning OFF the Replace the
power supply, correctly inverter PCB
insert the connector of (A2P).
the fan motor and then RZQ100~140C7,
restore the power. RZQS125140
YES C7 (1):
Replace the
D outdoor unit
PCB (A2P).
Note:
1 Optional accessories refer to wire adaptor, auto grill
and other accessories.
2 RZQ71B9V3BNo fuse
RZQS71100B7V3BNo fuse
RZQ100~140C7V1BF6U
RZQ125140C7V1BF6U
RZQ100~140B8W1BF1U
394
Troubleshooting by Remote Controller Si20-701_B
395
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Wiring indoor-outdoor transmission wire is incorrect.
Outside cause (noise, etc.)
Defective indoor unit PCB
Defective outdoor unit PCB
Defective outdoor unit fan
Power supply -open phase etc.
396
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Diagnosis of incorrect or broken/disconnected wiring
If the LEDs on the indoor unit PCB are OFF, it
indicates that the transmission wiring between indoor
and outdoor units may be incorrect or broken/
disconnected.
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are the
connections of
wiring connecting NO
Wire properly.
indoor and outdoor (Correct
units proper? defective wiring
and wrong wire
type.)
YES
Turn OFF the power supply
once and then turn it ON
again.
Error is NO
displayed again. The indoor unit
PCB is normal.
YES Check for
external factors
Check HAP (noise, etc.).
(micro-computer normal
monitor) on the outdoor
unit PCB.
397
Si20-701_B Troubleshooting by Remote Controller
Is HAP
blinking? NO (Lamp is ON or OFF)
(Outdoor unit
PCB)
Turn OFF the power
YES supply and then turn it
ON.
Is HAP
blinking? YES
The outdoor unit
(Outdoor unit PCB is normal.
PCB) Check for
NO external factors
(noise, etc.).
Is HAP
lamp ON? YES
Replace the
(Outdoor unit outdoor unit PCB
PCB) whose lamp is
NO (OFF) ON.
CHECK 1, 2
Check the fan motor
connector.
Does the NO
resistance meet the Replace the fan
criteria? motor.
YES
Remove the No. 3 wire
connecting the indoor and
outdoor units and turn ON
the power again.
Is HAP
blinking? YES
(Outdoor unit Replace the
PCB) indoor unit PCB.
NO
The power
supply system
error or defective
B outdoor unit PCB
398
Troubleshooting by Remote Controller Si20-701_B
"U4" is
displayed YES
Replace the
continuously. indoor unit PCB.
NO
It is normal.
Check for
external factors
(noise, etc.).
399
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Wiring indoor-outdoor transmission wire is incorrect
Defective indoor unit PCB
Defective outdoor unit PCB
Burning out fuse
Defective outdoor unit fan motor
External factor (Noise, etc.)
Defective power supply
Disconnection of optional equipments
400
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
power supply NO
voltage between 180 Field factor
and 220 VAC?
YES
Continue
the condition
that the blinking
interval of HAP on YES
Connect the
outdoor unit PCB is (The phases of connecting line of
short (1) for more connecting lines of indoor and
than one indoor and outdoor outdoor unit
minute. unit do not fit each correctly.
other.)
NO
Is
there
wrong
wiring, a
wrong wire type,
loose terminal or NO
contact failure in the Wire correctly
transmission wiring and securely
between the fasten the
indoor and terminal screws.
outdoor
units?
YES
A
401
Si20-701_B Troubleshooting by Remote Controller
Is any
NO optional
accessory (2)
connected?
YES
Is
the power
for the optional
accessory supplied NO
Wire correctly.
from between 1 and 2
on terminal block
X2M?
YES
Is HAP
on the outdoor YES
unit PCB blinking? B
NO
Turn OFF the power
supply and disconnect the
connector of the outdoor
unit fan motor. Then turn
the power ON again.
Is HAP
on the outdoor YES
Replace the
unit PCB blinking? outdoor unit fan
(1) motor.
NO
C
Note:
1 ON for 0.2 second and OFF for 0.2 second (Blink
about 25 times for 10 seconds)
(Normally, ON for 0.4 second and OFF for 0.4 second
(Blink about 12 times for 10 seconds))
2 Optional accessories refer to adaptor for wiring, auto
grill and other accessories.
402
Troubleshooting by Remote Controller Si20-701_B
Is
the resistance NO
value of the outdoor Replace the
unit fan motor outdoor unit fan
normal? motor.
YES
Does the NO
fuse (F6U) have Make the fuse
continuity? normal.
In case of a fuse
can be
YES replaced,
replace the
After turning OFF the fuse.
power supply, correctly In case of a fuse
insert the connector of cannot be
replaced,
the fan motor and then replace PCB.
restore the power.
YES
Error is YES
displayed again? Replace the
outdoor unit
B PCB.
NO
403
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective remote controller
Defective indoor unit PCB
External factor (Noise, etc.)
Connection of 2 main remote controllers (When using
2 remote controllers)
404
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Control YES
by 2 remote
controllers
NO SS1 of
both remote YES
controllers is set to Set one of the
"Main." remote
controllers to
NO "Sub," turn OFF
All the power supply
indoor unit NO temporarily, then
PCB micro-computer restart operation.
normal monitors
blinking
YES Resets
normally when power NO
supply is turned OFF Replace the
temporarily. indoor unit PCB.
YES
Error could be
produced by
noise. Check the
surrounding area
and restart
operation.
Using
multicore
transmission YES
wiring between indoor Change to
unit and remote double-core
controller independent
cable.
NO
Replace the
remote controller
PCB or indoor
unit PCB.
405
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective remote controller
Defective indoor unit PCB
External factor (Noise, etc.)
Connection of 2 main remote controllers (When using
2 remote controllers)
406
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Control YES
by 2 remote
controllers
NO SS1 of
NO both remote YES
controllers is set to Set one of the
"Main." remote
controllers to
"Sub," turn OFF
All the power supply
indoor unit NO temporarily, then
PCB micro-computer restart operation.
normal monitors
blinking
Resets
YES normally when NO
power supply is turned Replace the
OFF temporarily. indoor unit PCB.
YES
Error could be
produced by
noise. Check the
surrounding area
and restart
Using operation.
multicore
transmission YES
wiring between indoor Change to
unit and remote double-core
controller independent
cable.
NO
Is it good YES
condition from noise Replace the
interference? remote controller
PCB or indoor
NO unit PCB.
Error could be
produced by
noise. Check the
surrounding area
and restart
operation.
407
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective remote controller
Defective indoor unit PCB
External factor (Noise, etc.)
Connection of 2 main remote controllers (when using
2 remote controllers).
408
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Control YES
by 2 remote
controllers
NO SS1 of
NO both remote YES
controllers is set to Set one of the
MAIN. remote
controllers to
SUB, turn OFF
All the power supply
indoor unit NO temporarily, then
PCB micro-computer restart operation.
normal monitors
blinking
Resets
YES normally when NO
power supply is turned Replace the
OFF temporarily. indoor unit PCB.
YES
The error could
be produced by
noise.
Check the
surrounding area
and restart
Using operation.
multi-core
transmission YES
wiring between indoor Change to
unit and remote double-core
controller independent
cable.
NO
Is "U5" NO
displayed constantly? Defective remote
controller PCB or
replace the
YES defective indoor
unit PCB.
External factor
(Noise, etc.)
409
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Connection of 2 main remote controllers (when using
2 remote controllers)
Defective remote controller
Defective indoor unit PCB
External factor (Noise, etc.)
410
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Using 2- YES
remote controllers
control.
SS1 of
NO both remote YES
controllers is set to Set one remote
"MAIN." controller to
"SUB"; turn the
NO power supply
OFF once and
then restart.
All
indoor PCB NO
micro-computer
monitors
blink.
YES Operation
returns to normal
when the power is NO
Replace the
turned OFF indoor unit PCB.
momentarily.
YES
There is
Replace the remote possibility of
controller and restart error caused by
operation. noise. Check the
surrounding area
and turn ON
again.
Is it YES
normal? Normal
NO
Replace the indoor unit
PCB, and then restart.
Is it YES
normal? Normal
NO
There is
possibility of
error caused by
noise. Check the
surrounding area
and turn ON
again.
411
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Improper connection of transmission wiring between
outdoor unit and external control adaptor for outdoor
unit
Improper connection of transmission wiring between
outdoor units
Improper cool/heat selection
Improper cool/heat unified address (outdoor unit,
external control adaptor for outdoor unit)
Defective outdoor unit PCB (A1P)
Defective external control adaptor for outdoor unit
412
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
there
any broken
wire or erroneous
wire connection in the NO
communication wiring Fix the outdoor
of multi outdoor units multi
unit system? connection
transmission
wiring and reset
power.
YES
C/H YES
SELECT is set to Replace the
"IND". outdoor unit PCB
(A1P).
NO
Cool / heat NO
selection is unified. Set C/H SELECT
to "IND."
YES
C/H
SELECT is set to YES
The cool / heat
"MASTER." unified address
for outdoor units
NO in outdoor -
outdoor unit
transmission is
duplicated. Set
the address
C/H correctly.
YES
SELECT is set to
"SLAVE."
Check
NO and see if the NO
following items are Fix the problem.
normal.
A B
413
Si20-701_B Troubleshooting by Remote Controller
A B
Does an
error occur when NO
the cool / heat selector Replace the
is set to "IND?" external control
adaptor for
outdoor unit.
YES
Replace the
outdoor unit PCB
(A1P).
414
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Transmission error between main remote controller
and sub remote controller
Connection among sub remote controllers
Defective remote controller PCB
415
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Controlling with NO
2-remote controller
YES SS-1
switch on NO
remote controller PCB Turn the SS-1
is turned to switch of one
"Main" remote controller
to "Main". Turn
YES OFF the power
supply, and
restart operation.
Both
SS-1 switches NO
on remote controllers Turn OFF the
are turned to
"Sub". power once and
restart operation.
YES Replace the
remote controller
PCB if any error
is generated.
416
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Transmission error between main remote controller
and Sub remote controller
Connection among sub remote controllers
Defective remote controller PCB
417
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Controlling with NO
2-remote controller
YES SS-1
switch on NO
remote controller PCB Turn the SS-1
is turned to switch of one
"Main" remote controller
to "Main".
YES Turn OFF the
power supply,
and restart
Both operation
SS-1 switches NO
on remote controllers Turn OFF the
are turned to
"Sub" power once and
restart operation.
YES Replace the
remote controller
PCB if any error
is generated.
418
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Transmission error between main remote controller
and sub remote controller
Connection among sub remote controllers
Defective remote controller PCB
419
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Controlling NO
with 2-remote
controller
YES SS-1
switch on NO
remote controller PCB Turn the SS-1
is turned to switch of one
MAIN. remote controller
Both to MAIN.
SS-1 YES Turn OFF the
switches on NO power supply,
remote controllers are and restart
turned to SUB. operation.
YES Is there
continuity in YES
remote controller Turn OFF the
wiring? power once and
restart operation.
Replace the
NO remote controller
PCB if any error
is generated.
Replace the
remote controller
wiring.
Turn the SS-1
switch of one
remote controller
to MAIN.
Turn OFF the
power supply,
and restart
operation.
420
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective transmission within or outside of other
system
Defective electronic expansion valve in indoor unit of
other system
Defective indoor unit PCB in other system
Improper connection of transmission wiring between
indoor and outdoor unit
421
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Have
2 minutes and YES
over passed since Make judgement
the "U9"code was again based on
indicated? the indication
after 2 minutes
NO and over have
passed.
Start operation of all the
indoor units.
The
"UA" code
blinks in the
remote controller of YES
Go on to the "UA"
the other unit in the troubleshooting
same refrigerant
circuit.
NO
The
"A1" code
blinks in the
remote controller of YES
Go on to the "A1"
the other unit in the troubleshooting
same refrigerant
circuit.
NO
The
"A9" code
blinks in the
remote controller of YES
Go on to the "A9"
the other unit in the troubleshooting
same refrigerant
circuit.
NO
A
422
Troubleshooting by Remote Controller Si20-701_B
The
"U4" code
blinks in the
remote controller of YES
Go on to the "U4"
the other unit in the troubleshooting
same refrigerant
circuit.
NO
Go on to the "U5"
troubleshooting
423
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective indoor unit or outdoor unit PCB
Defective power supply PCB
Indoor-outdoor, indoor-indoor unit transmission wiring
Defective remote controller wiring
424
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
remote controller YES
connected to more Connect the
than 1 indoor remote controller
unit? correctly.
NO
Is the
outdoor unit NO
using for Twin Check setting.
system?
YES
Is the
setting of NO
Pair/Twin/Triple set Set correctly.
correctly?
YES
Are the
micro-computer
normal monitors NO
(HAP) of all indoor
unit PCB
blinking? Is the
indoor-indoor
and indoor-outdoor NO
YES Connect
jumper correctly correctly.
connected?
A
YES
Is the
power supply NO
PCB correctly Connect
connected? correctly.
YES
Is
there 220-
240 VAC between NO
No.1 and No.3 of X2M Replace the
(indoor Unit)? transformer.
YES
Wiring could be
incorrect;
recheck.
425
Si20-701_B Troubleshooting by Remote Controller
Are the
transmission
normal monitors NO
(HBP) of all indoor
unit PCB
blinking?
YES
Turn the power OFF once,
then restart, and restart
operation.
Operating NO
normally?
YES Is the
indoor-indoor
and indoor-outdoor NO
Connect
jumper correctly correctly.
connected?
YES
Replace the
indoor unit PCB.
Operates
normally.
426
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Excess of connected indoor units
Defective outdoor unit PCB (A1P)
Mis-matching of the refrigerant type of indoor and
outdoor unit.
Setting of outdoor unit PCB was not conducted after
replacing to a spare PCB.
427
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the NO
error code "UA" Normal
displayed? (It is assumed
that the code is
displayed due to
YES temporary
Is external cause
the error (e.g. noises).
code "UA"
displayed for all YES
indoor units connected
to one and the
same
system? Is the
outdoor unit YES
PCB replaced to spare The setting after
NO PCB? replacing spare
PCB has not
A been set yet.
NO
The
total of
indoor units
displaying "UA" and
indoor units connected NO
The number of
to the same refrigerant indoor units that
system is within can be
connectable connected to a
number of single outdoor
unit 1 unit system is
excess of
YES allowable range.
Note:
1 The number of indoor units that can be connected to
a single outdoor unit system depends on the model of
outdoor unit.
428
Troubleshooting by Remote Controller Si20-701_B
A B
Does
the refrigerant NO
type of indoor and Matches the
outdoor unit refrigerant type
match? of indoor and
outdoor unit.
YES
Is it a
multi outdoor unit NO
connection Replace the
system? outdoor unit main
PCB.
YES
Is the
combination of NO
master unit and slave Change to a
unit correct? correct
combination.
Is YES
Replace the
the type outdoor unit main
of refrigerant PCB.
for the indoor units
with "UA" displayed NO
Correct the
corresponding to that combination of
for the outdoor indoor units with
units? "UA" displayed.
YES
Replace the
indoor unit PCB.
429
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Defective indoor unit or outdoor unit PCB
Defective power supply PCB
Indoor-outdoor, indoor-indoor unit transmission wiring
Defective remote controller wiring
430
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is the
remote controller YES
connected to more Connect the
than 1 indoor remote controller
unit? correctly.
NO
Is the
setting of NO
Pair/Twin/Triple set Set correctly.
correctly?
YES
Are the
micro-computer
normal monitors NO
(HAP) of all indoor
unit PCB
blinking?
Is the
indoor-indoor (1) NO
YES and indoor-outdoor Connect
jumper correctly correctly.
connected?
A
YES
Is the
power supply NO
PCB correctly Connect
connected? correctly.
YES
Is
there 220-
240 VAC between NO
No.1 and No.3 of X2M Replace the
(indoor Unit)? transformer.
YES
Wiring could be
incorrect;
recheck.
Note:
1. Only for pair/twin/triple/double twin
431
Si20-701_B Troubleshooting by Remote Controller
Operating NO
normally?
YES Is the
indoor-indoor
and indoor-outdoor NO
Connect
jumper correctly correctly.
connected?
YES
Replace the
indoor unit PCB.
Operates
normally.
432
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
For RZQ-C7
Indoor-Outdoor, Indoor-Indoor transmission line
Defective remote controller wiring
For RZQG
Defective indoor unit PCB and wrong wiring
Defective power supply PCB connection
Defective remote controller wiring
Defective indoor unit PCB
Failure for setting the number of simultaneous multi-
units
Wrong wiring of crossing transition wire
Defective connection of optional equipment
433
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
RZQG RZQ-C
series or RZQZ
series?
RZQ-C
Is the
outdoor unit NO
simultaneous ON/OFF Check the
multi of the indoor setting for
unit? number of
indoor units
YES connected to
the
simultaneous
ON/OFF multi
Are of the indoor
the remote unit.
controllers YES
connected to several Adopt only one
indoor units? of the remote
controllers.
NO
Is the
remote
controller wiring YES
jumped between Remove the
indoor units? jumper.
(Integrated
control in the
same circuit is
NO not allowed.)
Is the
field setting for NO
pair / twin system Connect
correct? correctly.
YES
A
434
Troubleshooting by Remote Controller Si20-701_B
Do the
micro-computer NO
normal monitors (HAP)
on all indoor unit
PCB's blink?
Are
YES the wires
between indoor- NO
indoor and indoor- Connect
outdoor correctly correctly.
connected?
YES
Is
the
power
supply for the
option device
connected from the NO
terminal block (X2M) Connect
between 1 and 2 correctly.
connecting indoor
and outdoor of
the indoor
unit?
Turn the power supply
OFF once, and restart. YES
Is the
power supply NO
PCB correctly Connect
connected? correctly.
YES
Is 220
VAC between YES
No.1 and 2 of X2M Check the
terminal (indoor power supply
unit)? system inside
the indoor unit.
NO
Could be
incorrect
wiring.
Check again.
435
Si20-701_B Troubleshooting by Remote Controller
Does
the system NO
conduct normal
operation?
YES
Are
the wires
between indoor- NO
indoor and indoor- Connect
outdoor correctly correctly.
connected?
YES
Replace the
indoor unit
PCB.
Normal
436
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective centralized address setting
Defective indoor unit PCB
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are
devices
relating to YES
centralized control Change the
connected to the setting so that
indoor the centralized
unit? address is not
duplicated.
NO
Replace the
indoor unit PCB.
437
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Address duplication of centralized controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
438
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Transmission error between optional controllers for
centralized control and indoor unit
Connector for setting main controller is disconnected.
(or disconnection of connector for independent /
combined use changeover switch.)
Defective PCB for centralized remote controller
Defective indoor unit PCB
439
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Check
the indoor
unit for which
UE is displayed. Is YES
the transmission error Continued to (C)
UE caused on all (on the following
indoor units? page)
NO
Is
the power
supply of the indoor NO
unit, on which the UE Make sure there
occurred, turned are no hazardous
ON? situations, and
then turn ON the
power supply.
YES
Has
the
setting of
centralized control NO
group No. been made
with the indoor unit on
which the UE
occurred? B
YES
440
Troubleshooting by Remote Controller Si20-701_B
A B
Can
the setting of YES
centralized control Make correct
group No. be setting of the
made? centralized
control group No.
NO
Was
the
centralized control NO
Check whether
group No. for indoor or not there are
unit changed? no problems with
the transmission
wiring length,
YES types of cables
and wires,
number of units
connected, and
others. If no
problems,
replace the
indoor unit PCB.
441
Si20-701_B Troubleshooting by Remote Controller
Check
the
transmission
wiring between Abnormal
centralized controller Correct the
for any broken wire. wiring.
CHECK 17
Normal
Check
the
transmission
wiring with the
master unit centralized Abnormal
Correct the
controller for any wiring.
broken wire.
CHECK 17
Normal
Has
the master
unit central setting NO
connector been Correct the
connected? connection of the
connector.
YES
D
442
Troubleshooting by Remote Controller Si20-701_B
Disconnect the
transmission wiring of the
master unit centralized
controller, and then check
the voltage between the
transmission terminals (F1
and F2) of the master unit
transmission equipment
using a multiple meter.
Is the
voltage
between the
terminals F1 (+) and NO
Replace the
F2 (-) in the range centralized
of 15.2 to controller.
17.6 VDC?
YES
Centralized
controller:
Normal
It is supposed
that the error
results from
external factors
(e.g. noises) from
other equipment.
443
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Transmission error between optional controllers for
centralized control and indoor unit
Defective indoor unit PCB
For RZQG
Defective PCB for central remote controller
Breaking and wrong wiring of connecting wire
Failure of the setting of group No. and address
444
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
transmission YES
wiring disconnected Fix the wiring
or wired correctly.
incorrectly?
RZQG NO
RZQ-C
Is the
power supply
turned ON for indoor NO
Turn indoor unit's
units displaying power supply.
error?
YES
Has
an indoor
unit once
connected been YES
Reset power
removed or its supply
address simultaneously
changed? for all optional
controllers for
NO centralized
control.
Is
transmission error NO
with all indoor
units?
YES Is the
group No. of NO
defective indoor units Set the group
set? No. correctly.
Is
the YES
transmission Replace the
wiring with the indoor unit PCB.
YES
centralized controller Fix the wiring
disconnected or wired correctly.
incorrectly?
NO
A
445
Si20-701_B Troubleshooting by Remote Controller
Is the
centralized
controller's YES
connector for setting Connect the
centralized controller connector
disconnected? correctly.
NO
Replace the
centralized
controller.
446
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Power supply wiring is broken or disconnected.
Mis-connection of field wiring
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is "UF"
displayed on the NO
External factor
remote controller? (Noise, etc.)
YES
Connect field
wiring exactly.
447
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Improper connection of transmission wiring between
indoor-outdoor units and outdoor-outdoor units
Failure to execute check operation
Defective indoor unit PCB
Stop valve is not opened
448
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Are the NO
stop valves Open stop valve.
opened?
YES
Is the
check operation NO
carried out?
YES Is
indoor-
outdoor and YES
outdoor-outdoor unit Replace the
transmission wiring indoor unit PCB.
normal?
Is
indoor - NO
outdoor and
outdoor - outdoor unit NO
After fixing
transmission incorrect wiring,
wiring press and hold
normal? the RESET
button on the
YES master outdoor
unit PCB for 5
seconds.
The unit will not
run for up to 12
minutes.
Wiring check
operation may
not have been
carried out
successfully.
Note:
Wiring check operation may not be successful if
carried out after the outdoor unit has been OFF for
more than 12 hours, or if it is not carried out after
running all connected indoor units in the fan mode for
at least an hour.
449
Si20-701_B Troubleshooting by Remote Controller
450
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective transmission wiring between the indoor and
outdoor units
Mismatching of wiring and piping
Refrigerant shortage
Clogged refrigerant piping system
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Does
"UF" appear YES
when the power is
turned ON?
The phase of
Except RZQG NO transmission wiring
RZQG between the indoor and
outdoor units is incorrect.
The
phase of
transmission wiring YES
between the indoor and Correctly
outdoor units is connect
incorrect. transmission
wiring between
the indoor and
NO outdoor units.
Is the
connection of
transmission wiring NO
and piping between the Match the
indoor and outdoor connection of the
units transmission
matched? wiring and piping
between the
indoor and
YES outdoor units.
A
451
Si20-701_B Troubleshooting by Remote Controller
CHECK 12 NO
Is the refrigerant level Recharge a
proper? proper amount of
refrigerant after
refrigerant
YES recovery and
vacuum drying.
CHECK 11
Check the
refrigerant piping
system for
clogging.
Note:
1 ON for 0.2 second and OFF for 0.2 second (Blink
about 25 times for 10 seconds)
(Normally, ON for 0.4 second and OFF for 0.4 second
(Blink about 12 times for 10 seconds))
452
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Defective transmission wiring between the indoor and
outdoor units
Mismatching of wiring and piping
Refrigerant shortage
Clogged refrigerant piping system
453
Si20-701_B Troubleshooting by Remote Controller
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Does
"UF" appear YES
when the power is
turned ON?
The phase of
NO transmission wiring
between the indoor and
outdoor units is incorrect.
Correctly connect
transmission
Is wiring between
the the indoor and
connection of outdoor units.
transmission wiring NO
and piping between the Match the
indoor and outdoor connection of the
units matched? transmission
wiring and piping
between the
indoor and
YES outdoor units.
CHECK 12 NO
Is the refrigerant Recharge a
level proper? proper amount of
refrigerant after
refrigerant
collection and
YES vacuum drying.
Check 11
Check the
refrigerant piping
system for
clogging.
454
Troubleshooting by Remote Controller Si20-701_B
Supposed Causes
Poor wiring connecting the indoor and outdoor units
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Connect the
wiring connecting
the indoor and
outdoor units
properly.
455
Si20-701_B Troubleshooting by Remote Controller
Supposed Causes
Improper connection of transmission wiring between
indoor-outdoor units and outdoor-outdoor units
Defective indoor unit PCB
Defective outdoor unit PCB (A1P)
456
Troubleshooting by Remote Controller Si20-701_B
Troubleshooting
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
Caution may be damaged.
Is
electricity
being introduce
for the first time YES
after installation or
after an indoor or
outdoor unit PCB
has been
replaced? Does
an error
occur even
NO after 12 minutes
elapses from the time NO
Normal
when electricity is
introduced to
indoor and
outdoor
units?
YES
Is
indoor -
outdoor and
outdoor - outdoor unit NO
After fixing
transmission wiring incorrect wiring,
normal? (1) press and hold
the RESET
button on the
YES master outdoor
unit PCB for 5
Press and hold the seconds.
RESET button on the The unit will not
outdoor unit PCB for 5 run for up to 12
seconds minutes.
Does an NO
error occur? Normal
YES
457
Si20-701_B Troubleshooting by Remote Controller
Disconnect
the outdoor-
outdoor unit
transmission wiring to YES
create the one-system Mount the DIII-
status, and then NET expander
check whether or adaptor.
not the system
is normal.
NO
Does
a "UH" error
occur for all indoor NO
Replace the
units in the system? indoor unit PCB.
YES
Replace the
outdoor unit PCB
(A1P).
Note:
1: Check the correct indoor-outdoor unit transmission
wiring and outdoor-outdoor unit transmission wiring
with the installation manual.
458
Troubleshooting by Remote Controller Si20-701_B
3.110 Check
CHECK 1
Measurement
1 White Judgement
point
2 Orange
1-4 1M or more
3 Brown
GND 2-4 100k or more
4 Blue
3-4 100 or more
5 100k or more
4-7
6
7 Red
For FBQ
(2) With the fan motor connector disconnected, measure
the resistance between each pin, then make sure that
the resistance is balanced in 30%.
5 Gray GND
4 Pink Vcc
3 Orange Hw
2 Blue HV
1 Yellow HU
459
Si20-701_B Troubleshooting by Remote Controller
CHECK 2
Red U
Black W
CHECK 3
460
Troubleshooting by Remote Controller Si20-701_B
461
Si20-701_B Troubleshooting by Remote Controller
462
Troubleshooting by Remote Controller Si20-701_B
463
Si20-701_B Troubleshooting by Remote Controller
CHECK 4
In cooling operation
Check items (Possible causes) Judgement
Does the outdoor unit fan run
Visual inspection
normally?
Is the outdoor unit heat exchanger
Visual inspection
clogged?
Check if there is a temperature
difference before and after EV
Is there clogging before or after
(capillary).
the EV (capillary)?
Check if the main valve unit of EV
operates (by noise, vibration).
Check if there is a temperature
difference before and after check
Is the check valve clogged?
valve.
Heat Pump model only
If YES, the check valve is
caught.
Is the HPS normal? Check continuity by using a tester.
Is the outdoor unit installed under
such conditions that short circuit Visual inspection
easily occurs?
Is the piping length 5 meters or
Visual inspection
less?
Conduct refrigerant collection and
Does air enter the refrigerant
vacuum drying, and then add
system?
proper amount refrigerant.
Conduct refrigerant collection and
Is the refrigerant overcharged? vacuum drying, and then add
proper amount refrigerant.
464
Troubleshooting by Remote Controller Si20-701_B
In heating operation
Check items (Possible causes) Judgement
Does the indoor unit fan run
Visual inspection
normally?
Is the indoor unit heat exchanger
Visual inspection
clogged?
Is the indoor unit installed under
such conditions that short circuit Visual inspection
easily occurs?
Check if there is a temperature
difference before and after EV
Is there clogging before or after
(capillary).
the EV (capillary)?
Check if the main valve unit of EV
operates (by noise, vibration).
Check if there is a temperature
difference before and after check
Is the check valve clogged?
valve.
Heat Pump model only
If YES, the check valve is
caught.
Is the HPS normal? Check continuity using a tester.
Is the piping length 5 meters or
Visual inspection
less?
Conduct refrigerant collection and
Does air enter the refrigerant
vacuum drying, and then add
system?
proper amount refrigerant.
Conduct refrigerant collection and
Is the refrigerant overcharged? vacuum drying, and then add
proper amount refrigerant.
465
Si20-701_B Troubleshooting by Remote Controller
CHECK 5
In cooling operation
Check items (Possible causes) Judgement
Does the outdoor unit fan run
Visual inspection
normally?
Is the indoor unit filter clogged? Visual inspection
Check if there is a temperature
difference before and after EV
Is there clogging before or after
(capillary).
the EV (capillary)?
Check if the main valve unit of EV
operates (by noise, vibration).
Check if there is a temperature
difference before and after check
Is the check valve clogged?
valve.
Heat Pump model only
If YES, the check valve is
caught.
Is the LPS normal? Check continuity using a tester.
Is the indoor unit installed under
such conditions that short circuit Visual inspection
easily occurs?
Conduct refrigerant collection and
Is the refrigerant shortage? vacuum drying, and then add
proper amount refrigerant.
466
Troubleshooting by Remote Controller Si20-701_B
In heating operation
Check items (Possible causes) Judgement
Does the outdoor unit fan run
Visual inspection
normally?
Is the outdoor unit heat exchanger
Visual inspection
clogged?
Is the outdoor unit installed under
such conditions that short circuit Visual inspection
easily occurs?
Check if there is a temperature
difference before and after EV
Is there clogging before or after
(capillary).
the EV (capillary)?
Check if the main valve unit of EV
operates (by noise, vibration).
Check if there is a temperature
difference before and after check
Is the check valve clogged? valve.
If YES, the check valve is
caught.
Is the LPS normal? Check continuity using a tester.
Conduct refrigerant collection and
Is the refrigerant shortage? vacuum drying, and then add
proper amount refrigerant.
467
Si20-701_B Troubleshooting by Remote Controller
CHECK 6
Outdoor unit
fan connector
Residual voltage
Front face Earth terminal measurement spot
468
Troubleshooting by Remote Controller Si20-701_B
U V W
U V W
Comp.
469
Si20-701_B Troubleshooting by Remote Controller
CHECK 7
Pressure sensor
(4) Red
GND (3) Black
(2)
470
Troubleshooting by Remote Controller Si20-701_B
471
Si20-701_B Troubleshooting by Remote Controller
472
Troubleshooting by Remote Controller Si20-701_B
CHECK 8
Measurement
Criteria
point
(Orange) 1
1-5
(Red) 2 3-5
40~50
2-6
(Yellow) 3 4-6
(Black) 4
(Gray) 5
(White) 6
473
Si20-701_B Troubleshooting by Remote Controller
CHECK 9
Note:
Reference values for superheated degree to be used in
the judgement of wet operation
(1) Suction pipe superheated degree: 4C or more
(2) Discharge pipe superheated degree: 5C or less
(The values above must be used only for reference
purposes. Even it is operated within the range above,
operation may be normal in other conditions.)
474
Troubleshooting by Remote Controller Si20-701_B
CHECK 10
475
Si20-701_B Troubleshooting by Remote Controller
Cooling
As compressor
High frequency decreases,
pressure low pressure rises.
Low
Compressor frequency
pressure Maximum frequency decreases due to high
pressure protection control
Compressor
frequency Compressor frequency Minimum frequency
increases in order to
maintain low pressure.
Electronic expansion valve
opening degree decreases
due to wet protection control
Electronic
expansion
Minimum opening degree
valve
Suction
superheated Suction superheated degree is approx. 0 deg.
degree
Discharge
superheated
degree
(Degree of excessive refrigerant charging)
Adequate level Excessive charge
Heating
High
pressure
Low
pressure As compressor
frequency decreases,
low pressure rises.
Compressor
frequency
Minimum frequency
Compressor frequency
decreases in order to
maintain high pressure.
Electronic expansion valve
opening degree decreases
Electronic due to wet protection control
expansion
valve Minimum opening degree
Suction Suction superheated degree is approx. 0 deg.
superheated
degree
Discharge
superheated
degree
(Degree of excessive refrigerant charging)
Adequate Excessive charge
level
476
Troubleshooting by Remote Controller Si20-701_B
CHECK 11
(1)
(3) (3)
(4) (5)
(2)
ACC COMP.
Check
Check points Causes Remedies
factor
(1) Around Temperature Dust Replace the electronic
expansion difference Choked moisture expansion valve.
mechanism Reduced effective pipe
diameter due to adherent
contamination, etc.
(2) Accumulator Frosting Choked moisture Blow a nitrogen gas, and
then replace the
refrigerant.
(3) Distributor Temperature Dust Replace the heat
difference Choked moisture exchanger or distributor.
Reduced effective pipe
diameter due to adherent
contamination, etc.
(4) Field Temperature Collapsed pipe Replace the pipe.
piping difference
(5) Stop Temperature The stop valve is not fully Open the stop valve fully.
valve difference open.
477
Si20-701_B Troubleshooting by Remote Controller
CHECK 12
478
Troubleshooting by Remote Controller Si20-701_B
Cooling
Refrigerant shortage warning Abnormal refrigerant shortage
High pressure
Controlled high pressure
As compressor frequency
decreases, high pressure Actual high pressure
decreases.
Suction
superheat
degree
Compressor
frequency
479
Si20-701_B Troubleshooting by Remote Controller
480
Troubleshooting by Remote Controller Si20-701_B
Heating
Refrigerant shortage warning Abnormal refrigerant shortage
Low pressure
A decrease in evaporator capacity frequently
puts the system in defrost operation.
Compressor
frequency
In response to decreased evaporator capacity
caused by refrigerant shortage, capacity is Reaches the lowest frequency
controlled in the inverter in order to maintain high
pressure, which resulting in a rise in frequency.
481
Si20-701_B Troubleshooting by Remote Controller
CHECK 13
Check Measure
Defective PCB
If NG in steps 2 and 3
Replace the outdoor unit PCB.
Defective Hall IC
If NG in step 5 Replace the outdoor unit fan
motor.
If OK in steps 2, 3 and 5 Replace the outdoor unit PCB.
2 0V
3 15V
4 GND
5 NC
6 NC
482
Troubleshooting by Remote Controller Si20-701_B
CHECK 14
483
Si20-701_B Troubleshooting by Remote Controller
Improper model selection [In heating] Is the indoor unit too small
compared to the large-
sized outdoor unit?
Note:
1. In cooling, it is normal if the outdoor unit electronic
expansion valve (EVM) is fully open.
2. In heating, the indoor unit electronic expansion valve
is used for subcooling degree control.
484
Troubleshooting by Remote Controller Si20-701_B
CHECK 15
Check for causes of drop in low pressure
485
Si20-701_B Troubleshooting by Remote Controller
486
Troubleshooting by Remote Controller Si20-701_B
Note:
1. For details of compressor capacity control while in
cooling, refer to Compressor PI control.
2. The low pressure protection control includes low
pressure protection control and hot gas bypass
control.
3. In cooling, the indoor unit electronic expansion valve
is used for superheated degree control.
4. In heating, the outdoor unit electronic expansion
valve (EVM) is used for superheated degree control
of outdoor unit heat exchanger.
487
Si20-701_B Troubleshooting by Remote Controller
CHECK 16
J1
J2
J3
N3 U V W
P1 P3
488
Troubleshooting by Remote Controller Si20-701_B
Electronic circuit
P1 P2 P3
DM IGBT
X10A K2
L1 J1
L2 J2
L3 J3
N3
U V W
X11A
489
Si20-701_B Troubleshooting by Remote Controller
490
Troubleshooting by Remote Controller Si20-701_B
491
Si20-701_B Troubleshooting by Remote Controller
CHECK 17
Broken Wire Check of the Connecting Wires
492
Troubleshooting by Remote Controller Si20-701_B
Short circuit
between the
outdoor-outdoor
unit terminal
parts.
493
Warning z Daikin products are manufactured for export to numerous countries throughout the world. Prior to
purchase, please confirm with your local authorised importer, distributor and/or retailer whether
this product conforms to the applicable standards, and is suitable for use, in the region where the
product will be used. This statement does not purport to exclude, restrict or modify the application
of any local legislation.
z Ask a qualified installer or contractor to install this product. Do not try to install the product
yourself. Improper installation can result in water or refrigerant leakage, electrical shock, fire or
explosion.
z Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or
contractor to install those parts and accessories. Use of unauthorised parts and accessories or
improper installation of parts and accessories can result in water or refrigerant leakage, electrical
shock, fire or explosion.
z Read the User's Manual carefully before using this product. The User's Manual provides important
safety instructions and warnings. Be sure to follow these instructions and warnings.
If you have any enquiries, please contact your local importer, distributor and/or retailer.
Organization:
DAIKIN INDUSTRIES, LTD. Organization:
AIR CONDITIONING MANUFACTURING DIVISION DAIKIN INDUSTRIES
(THAILAND) LTD. All of the Daikin Group's business
Scope of Registration: facilities and subsidiaries in Japan
THE DESIGN/DEVELOPMENT AND MANUFACTURE OF Scope of Registration: are certified under the ISO 14001
COMMERCIAL AIR CONDITIONING, HEATING, COOLING, THE DESIGN/DEVELOPMENT international standard for
REFRIGERATING EQUIPMENT, HEATING EQUIPMENT, AND MANUFACTURE OF AIR environment management.
RESIDENTIAL AIR CONDITIONING EQUIPMENT, HEAT CONDITIONERS AND THE
RECLAIM VENTILATION, AIR CLEANING EQUIPMENT, COMPONENTS INCLUDING
JMI-0107 COMPRESSORS AND VALVES.
JQA-1452 COMPRESSORS USED FOR
THEM
Dealer
Head Office:
Umeda Center Bldg., 2-4-12, Nakazaki-Nishi,
Kita-ku, Osaka, 530-8323 Japan
Tokyo Office:
JR Shinagawa East Bldg., 2-18-1, Konan,
Minato-ku, Tokyo, 108-0075 Japan
http://www.daikin.com/global_ac/
c All rights reserved
zSpecifications, designs and other content appearing in this brochure are current as of January 2012 but subject to change without notice.
Si20-701_B
Printed in Japan 01/2012 K AK