Beijer Ref Service Support Handbook 19 Web 2

SERVICE
SUPPORT
HANDBOOK
Available from
WARNING
The information contained in this ‘Service Support Handbook’ is intended for use by qualified service technicians familiar with safety
procedures and equipped with the proper tools and test instruments.
This ‘Service Support Handbook’ is meant for guidance only, as it does not cover all installation circumstances, and therefore will not form
part of any legally binding contract. Additionally, the information presented here is not a replacement for, nor a substitute to, the
Manufacturers Technical Manuals or the installation instructions provided with the air conditioning equipment.
MHI Air Conditioners contain pressurized refrigerants that are harmful to the atmosphere so all refrigeration works must be performed by a
qualified "F-Gas" registered person.
Please do not remove any covers, or attempt any repair or measurement on any MHI air conditioning product, unless you are suitably
qualified and licensed to do so.
Repairs made by unqualified persons can result in hazards to you and others.
Technical Assistance is available Monday to Friday

between the hours of 08:00 and 17:00
tel: 03301 235 598
Email: mhitechnicalsupport@beijerref-technical.com
0919.1
MHI e-service app
MHI e-service
DCSL Software Ltd
Free
Compatibility
IPhone or IPad on IOS9.3 or later
Android devices on 4.3 or later.
Screenshots
Description
MHI e-service is an application that enables users to make a quick search of the meaning of error codes that may appear when there is a
malfunction in "Mitsubishi Heavy Industries Thermal Systems, Ltd" Air conditioning system, and the probable cause of the malfunction.
In addition this application enables you to scan unit's QR code and search the meaning of error codes depending on the model type.
The application covers "Mitsubishi Heavy Industries Thermal Systems, Ltd" Air conditioning systems: Split (RAC & PAC), VRF, Q-ton & A2W.
The MHI e-service app also incorporates a Refrigerant charge calculator for MHI’s current ranges of RAC & PAC splits, (single and multi-split
systems), and VRF systems.
The MHI e-service app is a free download available from Google Play for Android devices (4.03 or later), or the Apple App Store for IOS devices
(IOS9.3 or later).
0919.1
Remote Controls - Hi-Wall Mounted Split & Multi Split Systems
Before Proceeding to RAC Self Diagnosis Information,
ensure the correct Remote Control handset is being used.
Indoor Model Remote Control Replacement
SRK--HC-S, HC-S1, HD-S, ZD-S, ZDX-S, RMA502A001 /
RKT502A420
SKM--ZD-S RMA502A001C
SRK--HD-S1, HE-S1, ZD-S1, SKM--ZF-S RMA502A001C RMA502A001F
SRK--HG-S RKX502A001B RKX502A007B
SRK--ZE-S, ZE-S1, RKW502A200 RKW502A200D
SRK--ZFX-S, ZGX-S RKW502A200B -
SKM--ZG-S RKX502A001G -
SRK--ZG-S, ZHX-S, ZIX-S
RKX502A001C RKX502A007C
SRK--ZJ-S, ZJ-S1, ZJX-S, ZJX-S1
SRK--ZK-S RKX502A200 RKW502A200D
SRK--ZM-S, ZMX-S, ZR-S RLA502A700B RLA502A701B
SRK--ZMP-S RKX502A001P RKX502A007P
SRK--ZR-W RLA502A700R RLA502A701R
SRK--ZS-S, ZS-SB, ZS-ST,
RLA502A701L -
SRK--ZS-W, ZS-WB, ZS-WT
SRK--ZSP-S, ZSP-W, SKM--ZSP-S, ZSP-W RKX502A008P RKX502A007P
SRK--ZSX-S, ZSX-SB, ZSX-ST,
RLA502A700K -
SRK--ZSX-W, ZSX-WB, ZSX-WT
Remote Controls - Floor Console Split & Multi Split Systems

SRF--ZIX-S, ZJX-S, ZJX-S1 RKX502A001K -
RLA502A701C /
SRF--ZMX-S RLA502A700C
RLA502A701S
Remote Controls - Ducted Multi Split Systems

RMA502A001C /
SRRM--ZE-S RMA502A001
RMA502A001F
SRRM--ZF-S RMA502A001C RMA502A001F
SRR--ZJ-S RKX502A001B RKX502A007B
SRR--ZM-S RLA502A701C RLA502A701S
SRR--ZM-W RLA502A701S -
SRR--ZS-W RLA502A701AF -
Remote Controls - Cassette Multi Split Units

RMA502A001C /
STM--ZE-S RMA502A001
RMA502A001F
STM--ZF-S RMA502A001C RMA502A001F
0919.1
RKX502A001C
RKW502A200
0919.1
RKX502A008P
RLA502A701S
0919.1
RLA502A700K
On SRK—ZSX-S, ZSX-S1 and ZSX-W the GREEN operation LED becomes BLUE when “ECO” mode is selected.
0919.1
RC-E5 Layout
Red light flashing and Blank display

This remote control can be connected to upto 16 indoor units. If only ONE indoor unit is connected the fault code will be shown directly otherwise when one of the
connected units goes into fault the remote cannot show the fault code so it will flash the red LED whilst clearing the screen.
To identify the fault and which units faulty press the “AIR CON NO.” button on the remote and use the “/\” and “\/” buttons above the “CHECK” button to view the
individual units status.
Filter Clean Indication

The ‘Filter Clean’ indication is timer based and is shown after a preset number of hours of indoor unit fan operation has occurred. It is recommended that the filters
are checked and, if necessary, cleaned before the indication is reset.
To reset the ‘Filter Clean’ indication timer press the “RESET” button a few times or once for each attached indoor unit.
The system must not be run without filters fitted and the filters MUST be regularly cleaned otherwise the airflow through the unit will be reduced AND the coil can
become blocked impairing the systems performance and efficiency.
Days of Week displayed in brackets and units not operating to time clock settings.
HOLIDAY MODE will automatically set if power to the system is disrupted (i.e. power-cut or the systems isolator is turned off).
When HOLIDAY MODE is set the remote control ignores the time clock function and will do until the HOLIDAY MODE is cancelled. The HOLIDAY Mode is set and
cancelled in the timer/weekly timer/ menu.
Press “TIMER” then “SET”
Use the “/\” and “\/” buttons above the “CHECK” button and go to ‘Weekly Timer’ then press “SET”
Use the “/\” and “\/” buttons above the “CHECK” button and go to ‘Holiday Set’ then press “SET”
Select each day of the week and press “SET” to set or cancel the days setting.
0919.1
RC-E5 OPERATION DATA
To access the RC-E5 Remote Controls Operation Data function, press the "CHECK" button on the MASTER remote control.
On 'Operation data' press the "SET" button.
If 'I/U No' is displayed select the unit number required, using the "/\" and "\/" buttons above the "CHECK" button, then press the "SET" button
All navigation is carried out using the "/\" and "\/" buttons above the "CHECK" button.
RAC Unit
Compatibility
01 MODE Current operation mode ok
02 SET TEMP °C Set temperature ok
03 RETURN AIR °C Return air sensor temperature ok
04 SENSOR °C Remote control sensor temperature ok
05 THI-R1 °C Indoor heat exchanger sensor (on U bend) ok
06 THI-R2 °C Indoor heat exchanger sensor (on Capillary) ok
07 THI-R3 °C Indoor heat exchanger sensor (on suction header) -
08 I/U FANSPEED Indoor unit fan speed -
09 DEMAND Hz Required frequency -
10 ANSWER Hz Response frequency -
11 I/U EEV PULSE Pulse rate of KX indoor unit expansion valve -
12 TOTAL I/U RUN Hr Total running hours of the indoor unit -
21 OUTDOOR °C Outdoor air temperature ok
22 THO-R1 °C Outdoor unit heat exchanger sensor ok
23 THO-R2 °C Outdoor unit heat exchanger sensor -
24 COMP Hz Compressor frequency ok
25 HP MPa High pressure (x10=Bar) -
26 LP Mpa Low pressure (x10=Bar) -
27 Td °C Discharge Pipe Temperature ok
28 COMP BOTTOM °C Compressor base temperature -
29 CT Amp Current ok
30 TARGET SH °C Target Super Heat -
31 SH °C Super Heat temperature -
32 TDSH °C Compressor discharge pipe super heat ok
33 PROTECTION No Protection state number of the compressor -
34 O/U FANSPEED Outdoor unit fan speed ok
35 63H1 63H1 High pressure switch on/off -
36 DEFROST Defrost control on/off ok
37 TOTAL COMP RUN Hr Total running hours of compressor -
38 O/U EEV1 PULSE Pulse rate of the outdoor unit expansion valve EEVC ok
39 O/U EEV2 PULSE Pulse rate of the outdoor unit expansion valve EEVH -
Details of 33 Compressor Protection Status

No. Contents of display
0 Normal
1 Discharge pipe temperature protection control
2 Discharge pipe temperature anomaly
3 Current safe control of inverter primary current
4 High pressure protection control
5 High pressure anomaly
6 Low pressure protection control
7 Low pressure anomaly
8 Anti-frost prevention control
9 Current cut
10 Power transistor protection control
11 Power transistor anomaly (Overheat)
12 Compression ratio control
13 -
14 Condensation prevention control
15 Current safe control of inverter secondary current
16 Stop by compressor rotor lock
17 Stop by compressor startup failure
0919.1
RC-EX1 & EX1A Layout
Touch panel control, which is operated by tapping the LCD screen with a finger, is employed for all functions
except for 1 On/Off switch, 2 Hi Power switch and 3 ECO switch.
0919.1
RC-EX3 Layout
except 1: On/Off switch, 2: F1 Programmable F1 switch and 3: Programmable F2 switch.
0919.1
RC-EX3A Layout
except 1: On/Off switch, 2: Programmable F1 switch and 3: Programmable F2 switch.
0919.1
RC-EX OPERATION DATA
To access the RC-EX Remote Controls Operation Data function, press ‘MENU’ on the MASTER remote control front screen.
Then press ‘NEXT’ followed by ‘SERVICE’ (RC-EX3 only), then ‘SERVICE & MAINTENANCE’.
Enter the service pass code, press ‘SET’ then press ‘OPERATION DATA’. You can then select the indoor unit you want to view.
Operation Data Description and RAC Unit Compatibility

No. Displayed Ref Units Description RAC
Compatibility
1 MODE Current operation mode ok
2 SET TEMP °C Set temperature ok
3 RETURN AIR °C Return air sensor temperature ok
4 SENSOR °C Remote control sensor temperature ok
5 THI-R1 °C Indoor heat exchanger sensor (on U bend) ok
6 THI-R2 °C Indoor heat exchanger sensor (on Capillary) ok
7 THI-R3 °C Indoor heat exchanger sensor (on suction header) -
8 I/U FANSPEED Indoor unit fan speed -
9 DEMAND Hz Required frequency -
10 ANSWER Hz Response frequency -
11 I/U EEV PULSE Pulse rate of KX indoor unit expansion valve -
12 TOTAL I/U RUN Hr Total running hours of the indoor unit -
21 OUTDOOR °C Outdoor air temperature ok
22 THO-R1 °C Outdoor unit heat exchanger sensor ok
23 THO-R2 °C Outdoor unit heat exchanger sensor -
24 COMP Hz Compressor frequency ok
25 HP MPa High pressure (x10=Bar) -
26 LP MPa Low pressure (x10=Bar) -
27 Td °C Discharge Pipe Temperature ok
28 COMP BOTTOM °C Compressor base temperature -
29 CT Amp Current ok
30 TARGET SH °C Target Super Heat -
31 SH °C Super Heat temperature -
32 TDSH °C Compressor discharge pipe super heat ok
33 PROTECTION No Protection state number of the compressor -
34 O/U FANSPEED Outdoor unit fan speed ok
35 63H1 63H1 High pressure sw itch on/off -
36 DEFROST Defrost control on/off ok
37 TOTAL COMP RUN Hr Total running hours of compressor -
38 O/U EEV1 PULSE Pulse rate of the outdoor unit expansion valve EEVC ok
39 O/U EEV2 PULSE Pulse rate of the outdoor unit expansion valve EEVH -
Details of 33 Compressor Protection Status

No. Contents of display
0 Normal
1 Discharge pipe temperature protection control
2 Discharge pipe temperature anomaly
3 Current safe control of inverter primary current
4 High pressure protection control
5 High pressure anomaly
6 Low pressure protection control
7 Low pressure anomaly
8 Anti-frost prevention control
9 Current cut
10 Power transistor protection control
11 Power transistor anomaly (Overheat)
12 Compression ratio control
13 -
14 Condensation prevention control
15 Current safe control of inverter secondary current
16 Stop by compressor rotor lock
17 Stop by compressor startup failure
0919.1
RAC INDICATION & FAULT CODES
ZD, ZE, ZE-S1, ZG, ZJ, ZJ-S1, ZM, ZR, ZS, ZMP, ZSP,
Inverter RAC SRK
ZFX, ZGX, ZHX, ZIX, ZJX, ZJX-S1, ZMX, ZSX
Indoor Unit
SRR/ SRF ZIX, ZJX, ZJX-S1,ZMX
Inverter RAC ZD, ZE, ZE-S1, ZG, ZJ, ZJ-S1, ZM, ZR, ZS, ZMP, ZSP,
SRC
Outdoor Unit ZFX, ZGX, ZHX, ZIX, ZJX, ZJX-S1, ZMX, ZSX
Indoor Unit Display Outdoor Wired Description of Trouble Possible Cause
Control Remote
Timer
Run Light PCB, Control
Light
Green Amber Red LED
0.5s / 0.5s - - - - Inval id Opera tion (SCM mults pli t)
1.5s / 0.5s - - - - Pre- Hea t opera tion (Fa n s topped to prevent cold dra ught on hea ting s ta rt)
3s / 1s - - - - Cl ea n Mode Active
3.5s / 0.5s - - - - Auto OFF duri ng Sta nd By
- ON - - - Ti mer Mode Active (ON/OFF/Weekly/Sleep)
OFF Fl a s hing - E21 Limit Switch error Defective limit s witch, a i r inlet pa nel s et, I/D control PCB
1x ON - - Heat exchanger s ens or (1) error Broken hea t excha nger s ens or (1) wire, poor connection
2x ON - E7 Room tempera ture s ens or Broken room temperature s ens or wire, poor connecti on
2x 2x 7x E60 Rotor lock Fa ulty compres s or, open pha s e on compres s or, fa ul ty outdoor P.C.B.
3x ON - - Heat exchanger s ens or (2) error Broken hea t excha nger s ens or (2) wire, poor connection
4x ON - E9 Dra in Fa ult Fl oa t s witch a ctiva ted, fa ul ty pump, fa ul ty PCB, fa ulty floa t s wi tch
5x ON 2x E47 Acti ve Fi lter vol ta ge error Defective Active Fil ter, i ncorrect power s uppl y
6x ON - E16 Indoor fa n motor error Fa ult i ndoor fa n motor, poor connection
Refri gera ti on s ys tem protective

7x ON 2x E57 Service va lve clos ed, refrigera nt i ns uffi cient
control
Servi ce va lve (ga s s i de) clos ed,
7x 1x 4x E40 Output current of inverter exceeds s pecifi ca tion
defective outdoor PCB
Fla s hi ng 1x 8x E38 Outdoor a i r temp s ens or Broken s ens or wire, poor connecti on
Fla s hi ng 2x 8x E37 Outdoor hea t excha nger s ens or Broken s ens or wire, poor connecti on
Fla s hi ng 4x 8x E39 Dis cha rge pipe s ens or Broken s ens or wire, poor connecti on
Compres s or l ocking, open pha s e on compres s or output, s hort circuit on power

ON 1x 1x E42 Current Cut
tra ns is tor, clos ed s ervice va l ve, EEV not openi ng
Broken compres s or wire, broken power tra ns is tor, broken dis cha rge s ens or
ON 2x 2x E59 Trouble of outdoor unit
wire/poor connecti on, compres s or blockage
ON 3x 3x E58 Current s a fe s top Overl oad protection, over cha rged, compres s or locki ng
ON 4x 1x E51 Power Tra ns i s tor error Fa ulty power tra ns is tor
ON 5x 5x E36 Over hea t of compres s or Low on ga s , fa ulty di s cha rge pi pe s enor, cl os ed s ervi ce va lve
ON 6x 6x E3 / E5 Error of s i gna l tra ns mi s s ion Defective power s uppl y, broken s igna l wi re, fa ulty indoor/outdoor P.C.B.
ON 7x ON E48 Fa ulty outdoor fa n motor Fa ulty condens er fa n motor, poor connecti on
Overl oad protection, over cha rged, broken outdoor hea t excha nger s ens or
ON Fl a s hing 2x E35 Cooling High Pres s ure Protection
wire, clos ed s ervice va lve
On the SRK ZSX-S, ZSX-S1, ZSX-W the GREEN operation LED will change to BLUE when operating in “ECO” mode.
0919.1
RAC MULTISPLIT INDICATION & FAULT CODES
SRK ZJ-S, ZJ-S1 ,ZM-S, ZS-S ZJX-S, ZJX-S1, ZMX-S, ZSX-S ZK-S,ZM-S,ZR-S
SKM ZSP-S
SRR ZJ-S, ZM-S
Inverter Multi Indoor SRF ZJX-S, ZJX-S1, ZMX-S
FDTC VD,VF, VF/1, VH
FDUM VF, VF/1, VG
FDEN VD, VF, VF/1, VG
Inverter Multi Outdoor SCM ZJ-S, ZJ-S1, ZM-S, ZS-S

Control Remote
Timer
Light
Green Amber Red LED
Unit is connected to SCM Multis plit which is opera ting i n a mode di fferent to
0.5s / 0.5s - - - Inva lid Operation
the mode reques ted.
1.5s / 0.5s - - - - Pre- Heat opera ti on (Fa n s topped to prevent col d draught on heating s ta rt)
3s / 1s - - - - Clean Mode Active
3.5s / 0.5s - - - - Auto OFF during Sta nd By
- ON - - - Timer Mode Active (ON/OFF/Weekly/Sleep)
- - 8 E54 High pressure sensor Faulty high pressure sensor, faulty control PCB.
- Flashing - E21 Limit switch error Defectiv e limit switch, air inlet panel set, I/D control PCB
1x ON OFF - Indoor heat exchanger sensor 1 error Broken heat exchanger sensor (1) wire, poor connection
2x ON OFF - Room temperature sensor Broken room temperature sensor wire, poor connection
2x 2x 7x E60 Rotor lock Faulty compressor, open phase on compressor, faulty outdoor P.C.B.
3x ON OFF - Indoor heat exchanger sensor 2 error Broken heat exchanger sensor 3 wire, poor connection
4x ON OFF E9 Drain error Blocked drain, faulty float switch, faulty drain pump
5x ON 2x E47 Activ e filter v oltage error Defectiv e Activ e Filter, incorrect power supply
6x ON OFF E16 Indoor fan motor error Faulty indoor fan motor, poor connection
Refrigerant cycle system protectiv e

7x ON 2x E57 Closed serv ice v alv e, insufficient refrigerant
control
Flashing 1x 8x E38 Outdoor air temperature sensor Broken sensor wire, poor connection, faulty outdoor PCB
Flashing 2x 8x E37 Outdoor heat exchanger sensor Broken sensor wire, poor connection, faulty outdoor PCB
Flashing 4x 8x E39 Discharge pipe sensor Broken sensor wire, poor connection, faulty outdoor PCB
Flashing 5x 8x E53 Outdoor suction sensor Broken sensor wire, poor connection, faulty outdoor sub PCB
Compressor locking, open phase on compressor output, short circuit on power

ON 1x x1 E42 Current Cut
transistor, closed serv ice v alv e
Broken compressor wire, broken power transistor, broken discharge sensor wire or
poor connection, compressor blockage
ON 3x 3x E58 Current safe stop Ov erload protection, ov er charged, compressor locking
ON 4x 1x E51 Power transistor error faulty inv erter PCB, faulty main PCB or faulty fan motor
ON 5x 5x E36 Ov er heat of compressor Low on gas, faulty discharge pipe senor, closed serv ice v alv e
ON 6x 6x E5 Error of signal transmission Defectiv e power supply, broken signal wire, faulty indoor/outdoor P.C.B.
ON 7x Flashing E48 Outdoor fan motor or main PCB Faulty condenser fan motor or faulty main PCB
Ov erload protection, ov er charged, broken outdoor heat exchanger sensor

ON Flashing 2x E35 Cooling High Pressure Protection
wire, closed serv ice v alv e
On the SRK ZSX-S, ZSX-S1, ZSX-W the GREEN operation LED will change to BLUE when operating in “ECO” mode.
0919.1
RAC MULTISPLIT FAULT CODES - Historic Models
SKM ZD, ZF, ZG
Inverter Multi
SRRM ZE, ZF
Indoor
STM ZE, ZF
Inverter Multi SCM ZD-S, ZF-S, ZG-S
Outdoor
Timer Control Remote
Light
Green Amber Red LED
- - - E1 Error of wired remote Broken wire, faulty indoor P.C.B., faulty controller.
1x ON OFF E6 Broken heat exchanger sensor (1) wire, poor connection

Indoor heat exchanger sensor (1) error
2x ON OFF E7 Room temperature sensor Broken room temperature sensor wire, poor connection
2x 2x 7x E60 Rotor lock Faulty compressor, open phase on compressor, faulty outdoor P.C.B.
4x ON OFF E9 Drain error Blocked drain, faulty float switch, faulty drain pump
5x ON OFF E6 Broken heat exchanger sensor (2) wire, poor connection

Indoor heat exchanger sensor (2) error
6x ON OFF E16 Indoor fan motor error Fault indoor fan motor, poor connection
Closed serv ice v alv e, indoor Closed serv ice valve, indoor heat exchanger disconnected or open
7x ON OFF E6
heat exchanger sensor (1) circuit
Flashing 1x Flashing E38 Outdoor air temperature sensor Broken sensor wire, poor connection
Flashing 2x Flashing E37 Outdoor heat exchanger sensor Broken sensor wire, poor connection
4 sec
Flashing 4x E39 Discharge pipe sensor Broken sensor wire, poor connection
on/off
Flashing 5x Flashing E53 Compressor suction sensor Broken sensor wire, poor connection
Flashing 6x Flashing E41 Power transistor sensor error Broken sensor wire, poor connection
ON 1x 1x E42 Current Cut Compres s or l ocking, open pha s e on compres s or output, s hort circuit on power
tra ns is tor, clos ed s ervice va l ve
Broken compressor wire, broken power transistor, broken discharge
sensor wire or poor connection, compressor block age
ON 3x 3x E58 Current safe stop Overload protection, ov er charged, compressor locking
ON 4x 4x E41 Power transistor error Broken power transistor
ON 5x 5x E36 Ov er heat of compressor Low on gas, faulty discharge pipe senor, closed serv ice v alv e
ON 6x 6x E5 Error or signal transmission Defectiv e power supply, broken signal wire, faulty indoor/outdoor P.C.B.
ON 7x ON E48 Faulty outdoor fan motor Faulty condenser fan motor, poor connection
0919.1
SRF, SRK and SRR Inverter Split Systems - SERVICE MODE – R32 and R410A Models Only
Term Explanation
The service mode is the mode where service data are displayed by flashing lights when the operations
Service Mode
described below are performed with the indoor controller
Service Data These are the contents of error displays and protective stops which occurred I the past in the system. Error
display contents and protective stop data from past anomalous operations are saved in the indoor unit
controller's non-volatile memory. There are two types of data, self-diagnosis data and stop data.
These are the data which display error display (self-diagnosis display) occurred in an indoor unit. Data are
Self-Diagnosis
recorded for up to 5 previous occurrences. Data which is older than the 5th previous occurrence are erased.
Data
In addition, data on the temperature of each sensor are recorded when trouble occurs, so more detailed
(Error code)
information can be checked.
These are the data which display the reason by which a stop occurred when the system performed
protective stops, etc. in the past. If stop data alone are generated, the system restarts automatically.
Stop Data Data older than the 10th previous occasion are erased.
(Stop code) (Important) In cases where transient stop data only are generated, the system may still be normal.
However, if the same protective stop occurs frequently (3 or more times), it could lead to customer
complaints
Service mode display procedure
Start
Turn off the A/C's power, and then

wait one minute or longer.
Turn the A/C \'s power back on while

pressing the unit ON/OFF button.
*1: If the buzzer does not sound no matter
how many times you repeat the operation,
NO (*1) the unit ON/OFF button may be stuck or
Did a buzzer located in
faulty
the indoor unit sound?
Within 1 minute after turning the A/C back on, signals

will be sent from the remote control (*2) *2: Set the remote controls settings on
"cooling operation", "fan speed MED" and
"Set temperature: 21C."
Count the number of times the RUN and TIMER lights flash (*3),
and check the contents of the error, etc. from the table.
Turn off the A/C's power to terminate the

Is other data displayed? service mode.
NO
Change the remote controls settings based

on the instructions in the table (*4)
0919.1
*3: To Count the number of flashes in the service mode, count the number of flashes after the light lights up for 1.5 sec initially (start
signal). Do not count start signal.
• In the case of current cut (example: stop code “42”)

The RUN light (10’s digit) flashes 4 times and the TIMER light (1’s digit) flashes 2 times.
4 x 10 + 2 x 10 = 42 > from the table, read the instructions for error code 42, “current cut”.
Run light
Timer light
*4: When in the service mode, when the remote control settings (operation switching, fan speed switching, temperature setting) are
set as shown in the following table and sent to the air conditioner unit, the unit switches to display of service data.
SELF-DIAGNOSTIC DATA
Remote Control Setting
Operation Contents of Output Data
Fan Speed
Mode
MED Displays the reason for stopping display in the past (error code).
Cooling HI Displays the room temp sensor reading at the time the error code was displayed in the past.
Displays indoor heat exchanger sensor temp at the time the error code was displayed in the past.
AUTO
LO Displays the remote control information at the time the error code was displayed in the past.
Displays the outdoor air temp sensor reading at the time the error code was displayed in the past.
MED
Heating
Displays the outdoor heat exchanger sensor temp at the time the error code was displayed in the
HI past.
Displays the discharge pipe sensor temp at the time the error code was displayed in the past.
AUTO
Only for Indoor Heat Exchanger 2 (ZHX, ZIX, ZJ, ZJX, ZK, ZL)
Remote Control Temp
When Error Occurred Remote Control
Setting When error occurred
Temp Setting
21ºC Previous time 26ºC Previous time
22ºC 2nd previous time 27ºC 2nd previous time
23ºC 3rd previous time 28ºC 3rd previous time
24ºC 4th previous time 29ºC 4th previous time
25ºC 5th previous time 30ºC 5th previous time
0919.1
ERROR CODE DATA
Displayed Data
Operation Fan Speed Temperature
Switching Switching Setting
Displays the reason for the stop the previous time an error
21ºC
code was displayed
Displays the reason for the stop 2 times previous time an error
22ºC
was displayed
Cooling Medium Displays the reason for the stop 3 times previous time an error
23ºC
was displayed
24ºC
was displayed
25ºC
was displayed
STOP DATA
Displayed Data
Operation Fan Speed Temperature
Switching Switching Setting
Displays the stop code the previous time when the A/C was
21ºC
stopped by protective control.
22ºC 2 times previous
Cooling LO 25ºC 5 times previous
Remote Control Information Tables

Display pattern when in Service Mode
Operation switching Fan Speed Switching

RUN light [i] TIMER light [ii] Fan
when there is an when there is an
Operation switching Speed Switching
abnormal stop abnormal stop
0 AUTO 0 AUTO
1 DRY 2 HI
2 COOL 3 MED
3 FAN 4 LO
4 HEAT 6 HI POWER
7 ECONO
0919.1
SENSOR TABLE
Room temperature sensor, indoor heat exchanger sensor, outdoor air temperature sensor, outdoor heat exchanger sensor.
Buzzer sound Run light Timer Light (1’s digit)
(10’s digit) 0 1 2 3 4 5 6 7 8 9
6 -60 -61 -62 -63 -64
5 -50 -51 -52 -53 -54 -55 -56 -57 -58 -59
4 -40 -41 -42 -43 -44 -45 -46 -47 -48 -49
Yes 3 -30 -31 -32 -33 -34 -35 -36 -37 -38 -39
(sounds for 0.1 second) 2 -20 -21 -22 -23 -24 -25 -26 -27 -28 -29
1 -10 -11 -12 -13 -14 -15 -16 -17 -18 -19
0 0 -1 -2 -3 -4 -5 -6 -7 -8 -9
0 0 1 2 3 4 5 6 7 8 9
1 10 11 12 13 14 15 16 17 18 19
2 20 21 22 23 24 25 26 27 28 29
3 30 31 32 33 34 35 36 37 38 39
No 4 40 41 42 43 44 45 46 47 48 49
(does not sound) 5 50 51 52 53 54 55 56 57 58 59
6 60 61 62 63 64 65 66 67 68 69
7 70 71 72 73 74 75 76 77 78 79
8 80 81 82 83 84 85 86 87 88 89
9 90 91 92 93 94 95 96 97 98 99
SENSOR TABLE
Discharge Pipe Sensor
Buzzer sound Run light Timer Light (1’s digit)
(10’s digit) 0 1 2 3 4 5 6 7 8 9
3 -60 -62 -64
Yes 2 -40 -42 -44 -46 -48 -50 -52 -54 -56 -58
(sounds for 0.1 second) 1 -20 -22 -24 -26 -28 -30 -32 -34 -36 -38
0 0 -2 -4 -6 -8 -10 -12 -14 -16 -18
0 0 2 4 6 8 10 12 14 16 18
1 20 22 24 26 28 30 32 34 36 38
2 40 42 44 46 48 50 52 54 56 58
No 3 60 62 64 66 68 70 72 74 76 78
(does not sound) 4 80 82 84 86 88 90 92 94 96 98
5 100 102 104 106 108 110 112 114 116 118
6 120 122 124 126 128 130 132 134 136 138
7 140 142 144 146 148 150
• If no data is recorded (error code is normal), the information display in the remote control becomes as follows.
Sensor name Sensor value displayed when the error code is normal
Room temperature sensor -64ºC
Indoor heat exchanger sensor -64ºC
Outdoor air temperature sensor -64ºC
Outdoor heat exchanger sensor -64ºC
Discharge pipe sensor -64ºC
• EXAMPLE - Outdoor air sensor temperature “42 ºC”

When the temperature value is ≧0, the buzzer does not sound. Run light x4 flashes and Timer light flashes twice.
BUZZER Off
RUN LIGHT
TIMER LIGHT
No Buzzer, Run light x 4, Timer light x 2.

0919.1
SERVICE DATA RECORD FORM
Customer Model number
Date of Investigation Serial number
Content of Complaint
Remote Control Settings Content of displayed data Display results Display
Temp Operation Fan speed Buzzer RUN light TIMER light content
setting Mode Setting Yes/No (Times) (Times)
MED Error code on previous occasion
Cooling HI Room temperature sensor on previous occasion
AUTO Indoor heat exchanger sensor 1 on previous occasion
21 LO Remote control information on previous occasion
MED Outdoor air temperature sensor on previous occasion
Heating
HI Outdoor heat exchanger sensor on previous occasion
AUTO Discharge pipe sensor on previous occasion
26 Cooling AUTO Indoor heat exchanger sensor 2 on previous occasion
MED Error code on 2nd previous occasion
Cooling HI Room temperature sensor on 2nd previous occasion
AUTO Indoor heat exchanger sensor 1 on 2nd previous occasion
22 LO Remote control information on 2nd previous occasion
MED Outdoor air temperature sensor on 2nd previous occasion
Heating
HI Outdoor heat exchanger sensor on 2nd previous occasion
AUTO Discharge pipe sensor on 2nd previous occasion
27 Cooling AUTO Indoor heat exchanger sensor 2 on 2nd previous occasion
MED Error code on 3rd previous occasion
Cooling HI Room temperature sensor on 3rd previous occasion
AUTO Indoor heat exchanger sensor 1 on 3rd previous occasion
23 LO Remote control information on 3rd previous occasion
MED Outdoor air temperature sensor on 3rd previous occasion
Heating
HI Outdoor heat exchanger sensor on 3rd previous occasion
AUTO Discharge pipe sensor on 3rd previous occasion
28 Cooling AUTO Indoor heat exchanger sensor 2 on 3rd previous occasion
MED Error code on 4th previous occasion
Cooling HI Room temperature sensor on 4th previous occasion
AUTO Indoor heat exchanger sensor 1 on 4th previous occasion
24 LO Remote control information on 4th previous occasion
MED Outdoor air temperature sensor on 4th previous occasion
Heating
HI Outdoor heat exchanger sensor on 4th previous occasion
AUTO Discharge pipe sensor on 4th previous occasion
29 Cooling AUTO Indoor heat exchanger sensor 2 on 4th previous occasion
MED Error code on 5th previous occasion
Cooling HI Room temperature sensor on 5th previous occasion
AUTO Indoor heat exchanger sensor 1 on 5th previous occasion
25 LO Remote control information on 5th previous occasion
MED Outdoor air temperature sensor on 5th previous occasion
Heating
HI Outdoor heat exchanger sensor on 5th previous occasion
AUTO Discharge pipe sensor on 5th previous occasion
30 Cooling AUTO Indoor heat exchanger sensor 2 on 5th previous occasion
21 Stop code on previous occasion
22 Stop code on 2nd previous occasion
23 Stop code on 3rd previous occasion
24 Stop code on 4th previous occasion
Cooling LO
Judgement
Remarks
0919.1
SERVICE MODE ERROR CODE & STOP CODE TABLE
Models SRK ZD-S, ZF-S, ZG-S ZFX-S, ZGX-S ZE-S, ZE-S1
Number of Flashes Stop or Error Content Cause Occurrence Conditions
(in Service Mode) Error Code Major Minor Category
Run LED Timer LED Category
(Green) (Amber)
Comp Lock, W iring short, Compressor start fails 42 times in
Compressor software
1x 11 Comp output is open phase, succession and the final failure is
start
Outdoor PCB faulty current cut.
W ith Compressor Serv ice v alv e closed, After the compressor starts, it
2x 12 Speed Lower than 20 Compressor output open stops due to current cut at less
rps phase, EEV faulty than 20 rps
Serv ice v alv e closed,
W ith Compressor W hen operation is stopped by
3x 13 Compressor output open
1x Current Cut Speed 20 rps or higher current cut at 20 rps or higher.
phase, EEV faulty
Excessiv e v oltage (DC Outdoor PCB faulty, Power W hen the DC v oltage (DC 280V)
4x 14
350V) supply abnormal exceeds 350V
Short circuit in power Outdoor PCB faulty, power
5x 15 W hen it is judged that the power
transistor (high side) transistor damaged
transistor was damaged at the
Current cut circuit Outdoor PCB faulty, power
6x 16 time the compressor started
breakdown transistor damaged
Compressor wires are W hen PW M calculation results
PW M calculation
1x 21 disconnected, Power are 0% continued for 3 minutes or
results are abnormal
transistor is damaged longer
W hen PW M calculation results of
Compressor wires are
Input is 2A or lower 90% and an input current lower
2x 22 disconnected, outdoor PCB
(PW M 90% or higher) than the set v alv e continue for 3
is faulty
minutes or longer
Outdoor unit
W hen an abnormal stop occurs 3
error Serv ice v alv e is closed.
times with automatic recov ery
2x Abnormal stop 3 times Compressor output is open
3x 23 within 20 minutes after the
in 20 minutes phase. Electronic expansion
outdoor unit's power supply was
v alv e is faulty. Low on gas.
turned on.
Power supply is faulty. W hen the power supply v oltage

9x 29 Voltage drop
Outdoor PCB is faulty drops during operation.
Outdoor unit's fan Outdoor fan motor faulty. W hen a fan speed of 75rpm or
Outdoor fan
7x 27 motor is abnormal (DC Poor connection. Faulty lower continues for 30 seconds or
motor error
motor only) outdoor PCB longer.
W hen there is a current safe stop
1x 31 Cooling current safe 1 in current safe mode 1 mode
during cooling operation
2x 32 Heating current safe 1 in current safe mode 1 mode
Ov ercharge. Compressor during heating operation
3x Current Safe
lock W hen there is a current safe stop
4x 34 Heating current safe 2 in current safe mode 2 mode
during heating operation
0919.1
(Green) (Amber)
Ov ercharge. Compressor
3x 6x 36 Current Safe Heating current safe 3 in current safe mode 3 mode
lock
during heating operation
Heating current safe 3
7x 37 in current safe mode 3 + 3A
+ 3A
mode during heating operation
Cooling ov erload 1 W hen there is a current safe stop
1x 41 (outdoor temp in ov erload 1 mode during
36~40*C) cooling operation
Heating ov erload 1 W hen there is a current safe stop
5~12*C) heating operation
Cooling ov erload 2 W hen there is a current safe stop
40~45*C) Ov ercharge. Compressor cooling operation
4x Current Safe
Heating ov erload 2 lock. Ov erload operation W hen there is a current safe stop
12~17*C) heating operation
Cooling ov erload 3
5x 45 in ov erload 3 mode during
(outdoor temp 45*C~)
cooling operation
Heating ov erload 3
6x 46 in ov erload 3 mode during
(outdoor temp 17*C~)
heating operation
Compressor W hen the discharge pipe's sensor
OFF 50 Discharge >110*C
ov erheat exceeds the set v alue
5x Power Cooling problem W hen power transistor temp
Power Transistor
1 51 transistor exceeds set v alue (compressor
>110*C
ov erheat stops).
Power supply faulty. W hen 1 min 55sec passes without
Signal not receiv ed
OFF 60 Incorrect wiring. Indoor/ communication from either the
for 1 min & 55 sec
outdoor PCB faulty outdoor or indoor being
Connections between W hen 10 sec passes after the
Serial signal Faulty interconnect indoor and outdoor are power is on without
6x 1x 61
error wiring faulty. Faulty indoor/ communication signals from the
outdoor PCB indoor/ outdoor unit being
Indoor/ outdoor PCB faulty. W hen 1 min 50 sec passes
Serial transmission
2x 62 Noise causing faulty without communication signals
error
operation from either indoor or outdoor unit
0919.1
(Green) (Amber)
Compressor faulty. After the compressor starts,
1x 71 Less than 16 rps Compressor output is open when it stops at less than 16 rps
phase. EEV is faulty. due to rotor lock
Ov erload operation. W hen the comp stops at 16rps or
2x 72 16 rps or higher
Outdoor unit PCB is faulty. higher due to rotor lock
Phase switching
3x 73
defects (U phase)
7x Rotor lock Phase switching
4x 74 W hen compressor start fails 42
defects (V phase)
Compressor is faulty.
Phase switching times in succession and the
Compressor wiring is faulty.
5x 75 defects (W phase or reason for the final failure is rotor
Outdoor unit PCB is faulty
can’t distinguish) lock.
Comp software start
6x 76 (within 4 sec after
phase switching)
W hen indoor fan motor is
Indoor unit fan motor is Faulty connection. Faulty
OFF 80 detected to be running at
abnormal fan motor. Indoor PCB faulty
300rpm or lower.
Discharge pipe sensor W hen a disconnected signal
Senor wire disconnected
1x 81 is abnormal (temp below 7*C) is sent for 15
faulty connection
(anomalous stop) sec or longer as the sensor data
Indoor heat W hen a temperature of -20*C or
2x 82 exchanger sensor is lower is sensed cont. for 40 min
faulty connection
abnormal (anomalous during heating operation.
Outdoor heat W hen a temperature or - 50*C or
3x 83 exchanger sensor is lower is sensed cont. for 40 min
faulty connection
abnormal (anomalous during heating operation.
Protectiv e Anti - condensation High humidity. Faulty Anti-condensation prev ention
4x 84
8x control control humidity sensor control is operating
operation Indoor fan speed drops. W hen the anti-frost control
5x 85 Anti-frost control Indoor heat exchanger operates and the compressor
sensor short circuit stops during cooling operation.
Heating ov erload. Indoor
W hen high pressure control
fan speed drops. Indoor
6x 86 High pressure control operates during heating
heat exchanger sensor short
operation and the comp stops.
circuit
Short of gas. Discharge pipe W hen compressor ov erheating
Comp ov erheating
7x 87 sensor is faulty. Closed protectiv e control operates and
protection control
serv ice v alv e. the compressor stops.
Refrigeration cycle
Serv ice v alv e closed. Short W hen refrigerant cycle system
8x 88 system protectiv e
of gas. protectiv e control operates.
control
0919.1
Models SRK ZJ-S, ZJ-S1,ZM-S, ZS-S ZHX-S, ZIX-S, ZJX-S,ZMX-S, ZSX-S ZK-S, ZM-S, ZR-S
(in Service Mode) Error Code
Run LED Timer LED
(Green) (Amber)
OFF 0 Normal - -
Cannot receiv e signals W hen 35 sec passes without

OFF Power supply is faulty. Power supply
for 35 sec (if communications signals from
5x 5 cables and signal lines are improperly
communications hav e either the outdoor or indoor unit
wired. Indoor/ outdoor PCBs are faulty.
recov ered being detected correctly
Cooling ov erload operation. Outdoor fan W hen the outdoor heat
Cooling high pressure
5x 35 speed drops. Outdoor heat exchanger exchanger sensor's v alue
control
sensor is short circuit. exceeds the set v alue.
Compressor ov er heat Low on gas. Discharge pipe sensor is W hen the discharge pipes sensor
6x 36
(115*C) faulty. Serv ice v alv e is closed v alue exceeds the set v alue.
W hen a temp of -55*C or lower is
sensed cont. for 20 sec while the
Outdoor heat exchanger Outdoor heat exchanger faulty. Poor power is on or after the outdoor
7x 37
sensor is abnormal. connections units speed has continued at 0rps
or higher for 2 min. (The comp
stops)
3x
sensed cont. for 20 sec while the
Outdoor air temp sensor Outdoor air temp sensor wire is faulty. power is on or after the outdoor
8x 38
is abnormal Poor connection units speed has continued at 0rps
or higher for 2 min. (The comp
stops)
Discharge pipe sensor is sensed cont. for 20 sec after the
Discharge pipe sensor wire is faulty. Poor
9x 39 abnormal (anomalous outdoor units speed has
connection
stop) continued at 0rps or higher for 10
min. (the comp stops)
If the inv erter output current
Serv ice v alv e (gas side) Serv ice v alv e closed, or faulty outdoor exceeds set v alue within 80
OFF 40
closed PCB seconds, after compressor ON in
heating
Serv ice v alv e closed. Compressor Compressor start fails 42 times in
2x 42 Current cut locked/faulty. Outdoor PCB faulty. EEV succession and final reason for
faulty. failure is current cut.
4x
W hen the wrong v oltage
Activ e filter v oltage connected for the power supply.
7x 47 Defectiv e activ e filter.
error W hen the outdoor control PCB is
faulty.
W hen a fan speed of 75rpm or
Outdoor fan motor Poor connection. Faulty fan motor. Faulty
8x 48 lower continues for 30 sec or
abnormal PCB.
longer.
0919.1
Models SRK ZJ-S, ZJ-S1,ZM-S, ZS-S ZHX-S, ZIX-S, ZJX-S,ZMX-S, ZSX-S ZK-S, ZM-S, ZR-S
(in Service Mode) Error Code
Run LED Timer LED
(Green) (Amber)
Short circuit in the power W hen it is judged that the power
Outdoor PCB is faulty, power transistor
1x 51 transistor (high side) transistor was damaged at the
damaged
Current cut circuit time the compressor started.
Refrigeration cycle
W hen the refrigeration cycle
7x 57 system protectiv e Serv ice v alv e closed. Short of gas.
protectiv e control operates
control
Refrigerant is ov ercharged. Compressor W hen there is a current safe
5x 8x 58 Current safe
locked. Ov erload operation. during operation.
W hen the current is 1A or less at
Compressor wiring is Compressor wiring is disconnected. the time the compressor started.
disconnected. Voltage Power transistor is damaged. Power W hen the power supply v oltage
9x 59
drop. Low speed supply construction is defectiv e. Outdoor drops during operation. W hen
protectiv e control PCB is faulty. the outdoor unit's speed is lower
than 26rps for 60 min.
After the compressor starts,
Ov erload operation. Faulty compressor.
OFF 60 Rotor lock when the compressor stops due
Faulty EEV. Faulty outdoor PCB.
to rotor lock.
W hen 10 sec passes after the
Connection lines power on without
Connection line is faulty. Indoor or
1x 61 between the indoor & communications signals from the
6x outdoor PCBs are faulty.
outdoor are faulty. indoor or outdoor being
detected correctly
W hen 7 min 35 sec passes
Indoor or outdoor unit PCBs are faulty. without communication signals
2x 62 Serial signal error
Noise causing faulty operation. from indoor or outdoor unit being
detected correctly.
W hen the indoor fan motor is
Indoor fan motor is faulty. Poor
OFF 80 Indoor fan motor is faulty detected to be running at 300
connection. Faulty indoor PCB.
rpm or lower
Indoor heat exchanger Indoor heat exchanger sensor wire faulty.
2x 82 sensed cont. for 40 min during
sensor abnormal Poor connection.
heating.
Anti-condensation High humidity condition. Faulty humidity Anti-condensation prev ention
4x 84
8x control sensor. control is operating.
W hen the anti-frost control
Indoor fan speed drops. Indoor heat
5x 85 Anti-frost control operates and the compressor
exchanger sensor is faulty
stops during cooling operation.
W hen high pressure control
Heating ov erload operation. Indoor unit
Heating high pressure operates during heating
6x 86 fan speed drops. Indoor heat exchanger
control operation and the compressor
sensor is short circuit.
stops.
0919.1
PAC SELF-DIAGNOSIS INFORMATION
FDT V, VD, VF, VF/1, VG, VH
FDTC V, VD, VF, VF/1, VH
FDU VF, VF/1, VG
Inverter PAC Indoor Units FDUM 1, 1R, V, VD, VF, VF/1, VG
FDE VG
FDEN V, VD, VF, VF/1
FDF VD
Error Code Indoor PCB LEDs Outdoor unit LEDs Description of Fault Possible Cause
RED GREEN (1) RED GREEN (1)
Off Flashing Off Flashing - Normal Operation
Power OFF, broken wire, blown fuse, broken transformer
No Error Off Off 2x Off Indoor unit power supply
wire
Code
Remote controller wires Poor or wrong connection, broken wire
3x Flashing Off Flashing
Remote controller Faulty Remote controller
Communication error (indoor-
"04 9F", Faulty interconnect wiring, faulty PCB
outdoor)
"W AIT" or Off Flashing 2x Flashing
Improper setting of master and slav e by Remote
"INSPECT I/U" Remote Controller
Controller
Communication error (indoor- Poor or wrong connection, broken wire, intrusion of noise,
E1 Off Flashing Off Flashing
remote control) faulty indoor PCB or remote control
Indoor - Outdoor communication
2x Flashing 2x Flashing Poor connection, incorrect wiring, indoor or outdoor PCB
fault
Electrical Noise CPU Runaway on Outdoor control PCB
E5
2x Flashing Off Flashing
Outdoor Control PCB Faulty Outdoor Control PCB (Communication Circuit)
2x Flashing Off Off Outdoor Control PCB Faulty Outdoor Control PCB or Power supply
Indoor heat exchanger temp
E6 1x Flashing Off Flashing Faulty sensor, poor connection, faulty indoor PCB
sensor
E7 1x Flashing Off Flashing Indoor return air temp sensor Faulty sensor, poor connection, faulty indoor PCB
Indoor heat exchanger temp
E8 1x Flashing Off Flashing Heating ov erload, faulty sensor, faulty indoor PCB
sensor
Blocked drain, faulty pump, faulty indoor PCB, faulty float
E9 1x Flashing Off Flashing Float switch activ ated
switch
E10 Off Flashing Off Flashing No. of indoor units connected Too many units connected to 1 controller (MAX 16)
No master assigned to slav es, incorrect wiring, broken
E14 3x Flashing Off Flashing Remote controller Fault
wire between master & slav e
Faulty Indoor fan motor, poor connection, faulty indoor
E16 1x Flashing Off Flashing Indoor fan motor
PCB
E18 1x Flashing Off Flashing Address Setting Error Address setting error of master and slav e indoor units
E19 1x Flashing Off Flashing Mode Setting Incorrect mode setting
E20 1x Flashing Off Flashing Indoor fan motor Fan motor speed fault or faulty indoor Power PCB
E21 1x Flashing Off Flashing Panel Limit Switch error Defectiv e limit switch, air inlet panel set, I/D control PCB
E28 Off Flashing Off Flashing Remote Controller temp sensor Faulty Remote controller temp sensor
0919.1
Inverter PAC Outdoor SRC ZHX-S, ZIX-S, ZJX-S, ZMX-S, ZSX-S
Error Code Indoor Unit Display Outdoor Location of trouble Description of trouble
Control
Run Light Timer Light PCB,
Green Amber Red LED
Installation, operation status Higher outdoor heat exchanger temp
Outdoor heat exchanger temp
E35 Off Flashing 2x Faulty outdoor heat exchanger temp sensor
sensor
Outdoor control PCB Faulty outdoor control PCB (temperature sensor input circuit)
Installation, operation status Higher discharge temperature

Discharge pipe temperature
E36 Off Flashing 5x Faulty discharge pipe sensor
sensor
Outdoor heat exchanger temp Faulty outdoor heat exchanger temp sensor, broken wire or poor
E37 Off Flashing 8x sensor connection
Outdoor air temperature sensor Faulty outdoor air temp sensor, broken wire or poor connection
E38 Off Flashing 8x
Discharge pipe temperature
Faulty discharge pipe sensor, broken wire, poor connection
E39 Off Flashing 8x sensor
Outdoor control PCB,
Current cut (anomalous compressor ov er current)
E42 Off Flashing 1x compressor
Installation, operation status Serv ice v alv e closing operation
Outdoor control PCB, power
E47 Off Flashing 2x Anomalous inv erter ov er current
transistor
Outdoor fan motor Faulty outdoor fan motor
E48 Off Flashing Flashing
Outdoor control PCB Faulty outdoor control PCB
Power transistor, outdoor control
E51 Off Flashing 1x Power transistor error
PCB
Operation status Shortage of refrigerant
E57 Off Flashing 2x
Installation status Serv ice v alv e closed
E58 Off Flashing 3x Current safe stop Ov erload operation, ov er charge, compressor locking
E59 Off Flashing 2x Compressor, outdoor control PCB Anomalous compressor start up
E60 Off Flashing 7x Compressor Anomalous compressor rotor lock
0919.1
FDCVA HEN, HENR, HENAR, HES, HESR, HESAR
Inverter PAC Outdoor FDC VN, VNA, VNP, VS, VSA, VNX, VSX
Error Code Indoor PCB LEDs Outdoor unit LEDs Description of Fault Possible Cause
RED GREEN (1) RED GREEN (1) INV LED
E33 Off Flashing 1x Flashing - Power supply Anomalous current on inv erter primary side
Phase open circuit, faulty outdoor control PCB
E34 Off Flashing 1x Flashing Flashing Power supply
(3 Phase model)
Outdoor heat exchanger Ov erheat of condenser, faulty thermistor,
E35 Off Flashing 1x Flashing Flashing
thermistor faulty outdoor PCB
High discharge temp, faulty sensor, faulty
E36 Off Flashing 1x Flashing Flashing Discharge pipe thermistor
outdoor control PCB
Outdoor heat exchanger Poor connection, broken wire, faulty thermistor,
thermistor faulty PCB
Poor connection, broken wire, faulty thermistor,
E38 Off Flashing 1x Flashing Flashing Outdoor ambient air sensor
faulty PCB
E39 Off Flashing 1x Flashing Flashing Discharge pipe thermistor
faulty PCB
Activ ation of HP switch (63H1), closed serv ice
E40 Off Flashing 1x Flashing Flashing High Pressure Error
v alv e, faulty PCB (63H1 Circuit)
E41 Off Flashing 1x Flashing 2 or 6x Power Transistor ov erheat Short circuit of air flow, faulty Inv erter PCB
Closed serv ice v alv e, faulty outdoor control
E42 Off Flashing 1x Flashing 1 or 5x Current Cut
PCB
Communication Error - Inv erter Poor Connection, faulty control or inv erter
to Control PCB PCBs
E47 Off Flashing 1x Flashing 7x Control PCB, Power transistor Anomalous inv erter ov er v oltage
E48 Off Flashing 1x Flashing Flashing Condenser fan motor Faulty fan motor or outdoor PCB
Closed serv ice v alv e, short of gas, faulty LP
E49 Off Flashing 1x Flashing Flashing Low Pressure Error
sensor, faulty outdoor control PCB
E51 Off Flashing 1x Flashing 2 or 6x Inv erter Error Faulty Inv erter PCB
E53 Off Flashing 1x Flashing Flashing Suction pipe thermistor
faulty PCB
Closed serv ice v alv e, short of gas, faulty LP
E54 Off Flashing 1x Flashing Flashing Low Pressure Sensor Error
sensor, faulty outdoor control PCB
E55 Off Flashing 1x Flashing Flashing Under-dome temp thermistor
faulty PCB
E57 Off Flashing 1x Flashing Flashing Low Pressure Error Insufficient refrigerant
E59 Off Flashing 5x Flashing Off or 4x Compressor start up error Faulty power supply, faulty inv erter circuit.
E60 Off Flashing 1x Flashing - Compressor Faulty compressor, faulty inv erter circuit.
Central Controller
E75 Off Flashing Off Flashing - Poor connection, broken wire, faulty controller
communication error
0919.1
Master/ Slave and Group Settings
Master / Slave Settings
All split system indoor units are supplied set up as a master unit as default and this only needs changing when the system being
installed is a multi-split system, excluding SCM or KX systems, comprising of 2 to 4 RAC or PAC indoor units running off a PAC single
split outdoor unit. The remote control wires and all wires of the interconnecting cable go to each indoor unit including the slave units.
When using RAC SRK indoor units, excluding ZMP/ZSP models, on a multi-split each indoor unit needs an SC-BIKN-E interface to
allow the installation of the wired remote control and setup of the master slave settings.
SYSTEM TYPE Master/Slave PAC Indoor Units SC-BIKN-E Interface

Unit SW5-1 SW5-2 SW3-1 SW3-2
Single Twin Triple Quad MASTER OFF OFF OFF OFF
Twin Triple Quad SLAVE 1 OFF ON OFF ON
Triple Quad SLAVE 2 ON OFF ON OFF
Quad SLAVE 3 ON ON ON ON
All indoor units on a multi-split system must be in the same space and operate off a single wired remote control as there is no
refrigerant control in the indoor units.
Group Settings
When multiple systems need to be controlled off a single RC-EX1A, RC-EX3(A) or RC-E5 wired remote control each system needs to
be given a different address. The system addressing is set on PAC unit indoor boards using SW2 or on RAC indoor units via SW1 on
the SC-BIKN-E interface. Up to 16 indoor units can be connected to a wired remote, including multi-split systems incorporating PAC
outdoor units.
System Indoor Outdoor System Master/ Slave Group Address Master / Slave
Unit Unit Type Unit Switch Setting Switch #1 #2
1 FDT FDC Split Master SW2 0 SW5 OFF OFF
2 FDT FDC Quad Master SW2 1 SW5 OFF OFF

FDT Slave 1 SW2 1 SW5 OFF ON
FDT Slave 2 SW2 1 SW5 ON OFF
FDT Slave 3 SW2 1 SW5 ON ON
3 SRK FDC Twin Master SW1 2 SW3 OFF OFF

SRK Slave 1 SW1 2 SW3 OFF ON
4 FDUM FDC Split Master SW2 3 SW5 OFF OFF
0919.1
E03 / E05 ERROR
These errors relate to the communications between the indoor unit and the outdoor unit. The errors could be due to
Incorrect address settings on indoor unit
Broken interconnecting cabling
Power Issue
Pump down initiated
faulty outdoor unit fan motor
faulty Electronic Expansion Valve (EEV)
Blown Fuse
Faulty PCB.
Note: figures in brackets ( ) relate to SC-BIKN2-E interface
1. Check indoor unit SW2 (SW1) and SW5 (SW3) switch settings.
If the unit is alone on the remote control it is a master unit so SW5-1 (SW3-1) and SW5-2 (SW3-2) should both be OFF.
If there are multiple SYSTEMS connected to the remote then make sure EACH SYSTEM has a UNIQUE address selected on SW2 (SW1).
(See previous page “Master/Slave and Group Settings”.
2. Is the RED LED flashing on any of the connected indoor units PCBs?
If a unit has its Red led flashing three times then that unit is a SLAVE that cannot find its MASTER indoor unit (unit with both SW5(SW3) switches 1 and
2 both OFF and the same SW2(SW1) rotary switch setting (number).
3. Check the VOLTAGE between terminals

1 to Earth 230Vac
2 to Earth 0-5Vac
1 to 2 230Vac
If a condensate pump is connected across 1 and 2 remove it. External condensate pumps should be independently supplied.
If the voltage between terminal 2 and Earth is greater than 5V check the neutral (2) connections in the isolator and outdoor units.
4. Check the VOLTAGE DC between

3 to Earth FDC: 24Vdc or SRK: 16Vdc
2 to 3 FDC: 2 to 20Vdc fluctuating
SRK: 2 to 16Vdc fluctuating
If the voltage (Vdc) is 0V then the interconnecting cable is open circuit, ensure that the wire 3 has not been put through an external condensate pumps
high water cutoff, OR the outdoor unit has a fault
If the voltage is steady 24Vdc (16Vdc on SRC) there is a connection fault on the indoor unit or the indoor unit PCB is faulty.
If the voltage does not get down to 2.0Vdc or achieve 20Vdc (16Vdc on SRC) then there is interference in the cable so check the wire terminations.
5. On the outdoor unit terminal block check the VOLTAGE DC between

3 to Earth FDC: 24Vdc or SRK: 16Vdc
2 to 3 FDC: 2 to 20Vdc fluctuating
SRK: 2 to 16Vdc fluctuating
If the voltage (Vdc) is 24Vdc then the interconnecting cable is open circuit OR the indoor unit has a fault.
If the voltage is steady is 0V with wire 3 disconnected then the outdoor unit PCB has a problem.
If the voltage does not get down to 2.0Vdc or achieve 20Vdc (16Vdc on SRC) then there is interference in the cable so check the wire terminations.
Check the LEDs on the outdoor unit PCB

The GREEN LED should be permanently flashing while the RED LED is OFF.
If the GREEN LED is not flashing then check the power supply (CNW) and fuses on the PCB. If the power and fuses are OK, wait a minute after
switching the mains OFF to the unit, then disconnect the fan motors (CNFAN1 & 2) and expansion valves (CNEEV1 and 2). Restore power and recheck
the Green LEDs state. If the LED starts flashing replace the fan motors and EEVs one at a time to identify the faulty item (See “TEST PROCEDURE –
ELECTROBNIC EXPANSION VALVE” and “DC FAN MOTOR TESTING”.
If the Green LED does not start flashing replace the PCB.
If the Green LED is flashing continuously and the RED LED is flashing TWICE there is a problem with the connection of the interconnecting cables (See
4. above).
0919.1
KX SELF-DIAGNOSIS INFORMATION
LED Display FDCA----HKXE4_HXKRE4. FDC----KXEN6, KXE6, KXRE6, KXZE1, KXZPE1,
Inverter KX KXZRE1
Indoor PCB Outdoor PCB
Error Code O/D 7 Green Red Green Red Location of Trouble Probable Causes
segment
display
keeps keeps Communication error (indoor- Poor or wrong connection, broken wire, intrusion
E1 stays off stays off
flashing flashing remote control) of noise, faulty indoor PCB or remote control
Number of connected indoor units exceeds the
keeps keeps keeps
E2 stays off Duplicated indoor unit address limitation, duplicated indoor unit address,
flashing flashing flashing
indoor control PWB anomaly.
Power not supplied to the O/D unit, mismatch
keeps 2x or stays keeps of pairing between I/D and O/D units, indoor
E3 stays off Outdoor unit signal line error
flashing off flashing control PWB anomaly, Outdoor control PWB
anomaly, Missing local wiring.
Unit address number setting error, remote
keeps 2xor stays keeps Communication error during control wires broken, poor
E5 2x
flashing off flashing operation connection/disconnection of remote control
wires, indoor control PWB anomaly
Indoor heat exchanger Anomalous connection of I/D heat exchanger
keeps keeps
E6 1x stays off thermistor (THI-R1, R2 or R3) temperature thermistor, I/D heat exchanger
flashing flashing
anomaly thermistor anomaly, I/D control PWB anomaly
Anomalous connection of I/D return air
keeps keeps Indoor return air temperature
E7 1x stays off temperature thermistor, I/D return air thermistor
flashing flashing thermistor (THI-A) anomaly
anomaly, I/D control PWB anomaly
I/D control PWB anomaly, Mistake in setting of
float switch, mistake in setting of optional
keeps keeps
E9 1x stays off Drainage trouble equipment, mistake in drain piping, drain motor
flashing flashing
anomaly, disconnection/breakage of drain
motor wires, CnI float switch connection fault
More than 16 indoor units
keeps keeps Excessiv e number of I/D units, remote control
E10 stays off stays off connected to a single remote
flashing flashing anomaly
control
keeps keeps Address setting error between IU address has been set using the "Master IU
flashing flashing master and slav e indoor units address set" function of remote control
Automatic address setting and manual address
keeps keeps keeps Address setting error by mixed
E12 stays off setting method are mixed when setting address
flashing flashing flashing setting method
of indoor units
Anomalous connection of I/D supply air
keeps keeps EEVKIT supply air temperature
E15 1x stays off temperature thermistor, I/D rsupply air thermistor
flashing flashing thermistor (THI-AF anomaly..
anomaly, I/D control PWB anomaly
Indoor fan motor anomaly I/D fan motor anomaly, foreign matter at
keeps keeps (FDT, FDTC, FDTW, FDTS, FDU, rotational area of fan propeller, fan motor
E16 1x stays off
flashing flashing FDUM, FDK, FDUT71, FDFW anomaly, dust on control PWB, blown fuse,
series) external noise, surge
Address setting error of the master indoor unit,
keeps keeps Address setting error of master no power to the master indoor unit, no
E18 1x stays off
flashing flashing and slav e indoor units connection of super link signal wires between
master and slav e indoor unit
0919.1
LED Display
Inverter KX FDCA----HKXE4_HXKRE4. FDC----KXEN6, KXE6, KXRE6, KXZE1, KXZPE1
Indoor PCB Outdoor PCB
segment
display
Indoor unit operation check or
keeps keeps Mistake in SW7-1 setting due to forgetting to
E19 1x stays off drain motor check mode
flashing flashing turn off SW7-1 after indoor operation check
anomaly
Indoor fan motor speed I/D fan motor anomaly, foreign matter at
keeps keeps anomaly (FDT, FDTC, FDTW, rotational area of fan propeller, fan motor
E20 1x stays off
flashing flashing FDTS, FDU, FDUM, FDK, FDUT71, anomaly, dust on control PWB, blown fuse,
FDFW series) external noise, surge
keeps keeps Defectiv e panel switch Defectiv e panel switch, disconnection of wiring,
E21 1x stays off
flashing flashing operation (FDT) defectiv e I/D control PWB
Unmatched pairing of 1.5kW KX indoor and KX6
keeps keeps Wrong connection with
E22 2x stays off /KXR6 outdoor unit, Indoor control PCB
flashing flashing Outdoor unit
anomaly, Outdoor control PCB anomaly
Anomalous connection of remote control
keeps keeps Remote control temperature temperature thermistor, remote control
flashing flashing thermistor anomaly (Thc) temperature thermistor anomaly, remote control
PWB anomaly
keeps keeps Unmatched connection of Indoor control PCB anomaly, Outdoor control
E30 stays off 1x
flashing flashing indoor and outdoor unit PCB anomaly
Mistake in address setting of outdoor units, more
keeps keeps Duplicated outdoor unit
E31 stays off 1x than 129 I/D units connected, no setting of
flashing flashing address number
master/slav e setting switch for combination use
Open L3 phase on power Anomalous power supply at primary side,
keeps keeps
E32 stays off 2x supply at primary side or outdoor control PWB anomaly, Incorrect power
flashing flashing
incorrect phase rota supply phase rotation
keeps keeps Discharge pipe temperature Discharge pipe temperature anomaly, SV1,2
E36-1 stays off 1x anomaly, breakage in coil, faulty main body,
flashing flashing error, Tho-D1
O/D control PWB anomaly, insufficient amount
E36 keeps keeps Discharge pipe temperature of refrigerant, insufficient airflow v olume, short
E36-2 stays off 2x
flashing flashing error, Tho-D2 circuit of airflow
keeps keeps
E36-3 stays off 3x Liquid flooding anomaly KX6 product only
flashing flashing
Outdoor heat exchanger
keeps keeps
E37-1 stays off 1x temperature thermistor
flashing flashing
anomaly, Tho-R1
keeps keeps
flashing flashing
anomaly, Tho-R2
keeps keeps
flashing flashing
anomaly, Tho-R3
E37
keeps keeps
flashing flashing Broken thermistor harness or the internal wire of
anomaly, Tho-R4
sensing section, disconnection of thermistor
Outdoor sub cooling coil
keeps keeps harness connection, O/D control PWB anomaly
E37-5 stays off 5x temperature thermistor 1
flashing flashing
anomaly, Tho-SC
Outdoor sub cooling coil
keeps keeps
E37-6 stays off 6x temperature thermistor 2
flashing flashing
anomaly, Tho-H
keeps keeps Outdoor air temperature
E38 stays off 1x
flashing flashing thermistor anomaly, Tho-A
keeps keeps Discharge pipe temperature
E39-1 stays off 1x
flashing flashing thermistor anomaly, Tho-D1
E39
keeps keeps Discharge pipe temperature
E39-2 stays off 2x
flashing flashing thermistor anomaly, Tho-D2
Short circuit of airflow at condenser side of heat
exchanger/disturbance of airflow/cloged filter
keeps keeps High Pressure anomaly, 63H1-1, /fan motor anomaly, disconnection of high
E40 stays off 1x
flashing flashing 2 activ ated pressure (HP) switch connector, breakage of HP
switch harness, closed serv ice v alv es, HP sensor
(PSH) anomaly, HP switch anomaly
Anomalous high temperature of power
keeps keeps Power transistor ov erheat,
E41-1 stays off 1x transistor is detected 5 times within 60 minutes.
flashing flashing CM1
Power transistor anomaly, power transistor
E41
temperature thermistor anomaly, inv erter PWB
keeps keeps Power transistor ov erheat,
E41-2 stays off 2x anomaly, outdoor fan motor anomaly,
anomalous cooling fan motor for inv erter
0919.1
LED Display
FDCA----HKXE4_HXKRE4. FDC----KXEN6, KXE6, KXRE6, KXZE1, KXZPE1,
Inverter KX Indoor PCB Outdoor PCB KXZRE1
segment
display
keeps keeps
E42-1 stays off 1x Current cut, CM1 Compressor anomaly, refrigerant leak, power
flashing flashing
E42 transistor module anomaly, anomalous power
keeps keeps
E42-2 stays off 2x Current cut, CM2 supply for INV PWB, O/D fan motor anomaly
flashing flashing
keeps keeps Excessiv e number of indoor

E43-1 stays off 1x
flashing flashing units connected Mistake in setting of I/D or O/D addresses,
E43
mistake in signal wire connection
keeps keeps Excessiv e total capacity of
E43-2 stays off 2x
flashing flashing connection
KXZ Product only. Mismatching of refrigerant

keeps keeps
E44-1 stays off 1x Liquid flooding anomaly, CM1 piping and or signal wiring, ov ercharging of
flashing flashing
refrigerant, anomalous control of superheat,
E44
anomalous circuit of liquid refrigerant by-pass,
keeps keeps
E44-2 stays off 2x Liquid flooding anomaly, CM2 anomalous refrigerant circuit of sub cooling coil,
flashing flashing
under dome temperature Tho-D1, D2 anomaly
Communication error between
keeps keeps
E45-1 stays off 1x inv erter PWB and outdoor Signal wire anomaly, O/D control PWB
flashing flashing
control PWB, INV 1 anomaly, INV PWB anomaly, inrush current
E45
Communication error between prev ention resistor anomaly, defectiv e 52C or
keeps keeps
E45-2 stays off 2x inv erter PWB and outdoor 52X, defectiv e diode module
flashing flashing
control PWB, INV 2
keeps keeps Mixed address setting methods Mistake in the address setting, mistake in the
flashing flashing coexist in the same network connection of signal wire
keeps keeps Outdoor DC fan motor
E48-1 stays off 1x Broken or disconnected wire, faulty fan motor,
flashing flashing anomaly, FMO1
defectiv e inv erter PWB, defectiv e control PWB,
E48
keeps keeps Outdoor DC fan motor defectiv e power transistor, defectiv e diode
E48-2 stays off 2x
flashing flashing anomaly, FMO2 module, defectiv e surge suppressor resistor
Low pressure sensor (PSL) anomaly, serv ice

keeps keeps
E49 stays off 1x Low pressure anomaly v alv es closed, EEV anomaly, insufficient
flashing flashing
refrigerant amount, clogging at EEV or strainer
keeps keeps Power transistor ov erheat, Anomalous high temperature of power transistor
E51-1 stays off 1x is detected 15 minutes continuously. Broken
E51 thermistor harness or the internal wire of sensing
keeps keeps Power transistor ov erheat, section, disconnection of thermistor harness
E51-2 stays off 2x
flashing flashing CM2 connection, O/D control PWB anomaly
Suction pipe temperature
keeps keeps
E53-1 stays off 1x thermistor anomaly, Tho-S,
flashing flashing Broken thermistor harness or the internal wire of
CM1
E53 sensing section, disconnection of thermistor
Suction pipe
keeps keeps harness connection, O/D control PWB anomaly
E53-2 stays off 2x temperaturethermistor
flashing flashing
anomaly, Tho-S, CM2
Broken sensor harness, disconnection of sensor
keeps keeps
E54-1 stays off 1x Low pressure anomaly (PSL) harness connection, sensor (PSH, PSL) anomaly,
flashing flashing
O/D control PWB anomaly, anomalous
E54
installation conditions, insufficient airflow
keeps keeps
E54-2 stays off 2x High pressure anomaly (PSH) v olume, excessiv e or insufficient refrigerant
flashing flashing
amount
keeps keeps Under dome temperature
E55-1 stays off 1x Broken thermistor harness or the internal wire of
flashing flashing thermistor anomaly, Tho-C1
keeps keeps Under dome temperature
E55-2 stays off 2x harness connection, O/D control PWB anomaly
flashing flashing thermistor anomaly, Tho-C2
keeps keeps Power transistor temperature
E56-1 stays off 1x Broken thermistor harness or the internal wire of
flashing flashing anomaly, Tho- P1
keeps keeps Power transistor temperature
E56-2 stays off 2x harness connection, O/D control PWB anomaly
flashing flashing anomaly, Tho- P2
keeps keeps Anomalous compressor by loss Insufficient time elapsed after the power
E58-1 stays off 1x supplied before compressor start up (unit
flashing flashing of synchronism, CM1
E58 started without crankcase heater ON),
keeps keeps Anomalous compressor by loss compressor anomaly, inv erter PWB anomaly,
E58-2 stays off 2x
flashing flashing of synchronism, CM2 power transistor anomaly
keeps keeps Compressor start up failure, Anomalous v oltage of power supply,

E59-1 stays off 1x anomalous components for refrigerant circuit,
E59 inv erter PWB anomaly, loose connection of
keeps keeps Compressor start up failure, connector or cable, compressor anomaly
E59-2 stays off 2x
flashing flashing CM2 (motor or bearing) 0919.1
LED Display
FDCA----HKXE4_HXKRE4. FDC----KXEN6, KXE6, KXRE6, KXZE1, KXZPE1,
Inverter KX Indoor PCB Outdoor PCB KXZRE1
segment
display
KX4 & KX6 Product. If it fails to detect the rotor

Keeps Keeps Rotor position detection error, position of compressor, after changing ov er to
E60-1 Stays off 1x
flashing flashing CM1 the operation of compressor rotor position
E60 detection, the compressor stops. It restarts
Keeps Keeps Rotor position detection error, automatically after 3 minutes delay. If this
E60-2 Stays off 2x anomaly occurs 4 times within 15 minutes after
the initial detection, error is displayed
keeps keeps
E61-1 stays off 1x the master unit and slav e units,
flashing flashing Signal wire anomaly, O/D control PWB
Slav e unit 1
E61 anomaly, INV PWB anomaly, inrush current
keeps keeps prev ention resistor anomaly
E61-2 stays off 2x the master unit and slav e units,
flashing flashing
Slav e unit 2
Emergency stop. When an ON
keeps keeps
E63 stays off 1x signal is inputted to the CNT Factor for emergency stop
flashing flashing
terminal of I/D control PWB
keeps keeps Central control
E75 stays off stays off Poor connection, broken wire, faulty controller
flashing flashing communications error
The indoor PCB has been replaced but the
links/switches on the replacement hav e not
keeps keeps
E85 stays off stays off Indoor unit PCB setting error been configured the same as on the original
flashing flashing
PCB, specifically SW8-3/J7 which is currently
open/off and needs to be closed/on.
keeps keeps Master/Slav e Outdoor Unit
- OPE 3 stays off stays off Inv alid combination of outdoor units
flashing flashing Control Switch Error
keeps keeps Correct the SW4 settings to match the outdoor
- OPE 7 stays off stays off SW4 Setting incorrect
flashing flashing unit model.
keeps keeps SW5 setting (Test Run or Pump Reset the SW5 switchs as the required function
- OPE 10 stays off stays off
flashing flashing down) in slav e outdoor unit can only be initiated in the master outdoor unit
KX SYSTEM ADDRESSING INFORMATION

KX systems comprises a number of indoor units connected to up to three connected outdoor units and communicate using MHI’s proprietary Superlink network
which also provides network communications to a Central Controller. Several systems can connect to the same network so it is important to ensure that the
addressing is correct. To facilitate this a systems Superlink (S/L) communications (A/B daisy-chain through the connected indoor units) should be connected to the
outdoor units A1/B1 terminals whilst inter system / central control wiring should be connected to A2/B2. This allows systems to be disconnected from the inter
system/central control network for easier commissioning.
Individual systems can auto address as standard by turning the power on to the outdoor unit first then switching on power to individual indoor units allowing a second
between them.
Indoor Unit Outdoor Unit
Installations with a Central Controller or multiple systems installed should be manually addressed as follows:
Do not turn on the power to the indoor or outdoor units until the indoor unit addressing has been completed.
The two green rotary switches (SW1 & SW2) on the outdoor unit should be set to a unique outdoor unit address (new S/L [KX6/KXZ]: 0~31, old S/L: 0~47) and the
two (SW3 & SW4) on the indoor unit PCB should match those on the control PCB of the master outdoor unit piped to them.
Where there are multiple outdoor units piped together they must all be set the same on the green SW1 & SW2 rotary switches and be set as master (Both OFF) or
slave units using the SW4-7 and SW4-8 dip switches. (When addressing systems allow for slave units, which have the master address +1 or +2 so System 0 with 3
outdoor units would use addresses 0, 1 and 2 therefore the next available system address is 4).
The indoor unit blue rotary switches (SW1 & SW2) and SW5-2 are used to give the unit a unique individual address (new S/L [KX6/KXZ]: 0~127, old S/L: 0~47) on
the Superlink network.
Note: as KX outdoor units have a 6 Hour compressor crankcase warm up period on first power switch their Mains on as quickly as possible.
0919.1
PFD Box Replacement
Compatibility for PFD BOX
Outdoor unit Indoor unit PFD BOX Super link Compatibility Remark
OLD OLD OK
KX4 NEW
NEW OLD OK Requires wiring modification
KXR4A NEW
OLD OLD OK
KX6 / KXZE1 NEW
NEW OLD OK
NEW
OLD OLD OK
KX4 NEW
NEW OLD OK Requires wiring modification
KXR6 NEW
OLD OLD OK
KX6 / KXZE1 NEW
NEW OLD OK
NEW OK
OLD OLD
KX4 NEW
NEW OLD
KXZR1 NEW
OLD OLD
KX6 / KXZE1 NEW
NEW OLD OK
NEW OK
OLD PFD BOX = PFD***E, PFD***ER or PFD112X4ER NEW PFD BOX = PFD***3E, PFD***4E, PFD1123X4 or PFD1124X4
PFD Box Connection

The PFD boxes are supplied with a Relay box that converts 12Vdc outputs from the indoor units CNT or CNT2 connector into 240V
control signals for the solenoid valves. The Relay box and connection are as follows
Flow Selector Box Relay Box To PFD Connection
PFD***E 3 Wire CNT
PFD***ER 4 Wire CNT
PFD***3E 5 Wire CNT2
PFD***4E 5 Wire CNT2
Output from CNT

Signal from Remocon Status of indoor unit 20S SVH SVG
XR2 XR3 NOT XR2 and XR3
Operation ON ON OFF
Thermo off ON ON OFF
Heating Stop in heating ON ON OFF
Defrost OFF OFF OFF
Oil return in heating OFF ON ON
Operation OFF OFF OFF
Thermo off OFF OFF OFF
Cooling Stop in cooling OFF OFF OFF
Defrost OFF OFF OFF
Oil return in cooling OFF ON ON
In pressure equlization *1 ON OFF OFF
Stop Before power on OFF OFF OFF
*1: when operation mode is changed between cooling and heating and oil return
XR1 OPERATION
XR4 ERROR
Output from CNT2

CNT2 Terminal Controlled SV
CNT2-2:XB1 20S
CNT2-3:XB2 SVH
CNT2-4:XB3 SVG
CNT2-5:XB4 SVE
Status of indoor unit XB1 20S XB2 SVH XB3 SVG XB4 SVE
Cooling/Stop/Defrost OFF OFF OFF OFF
Heating ON ON OFF OFF
Oil return OFF ON ON OFF
Cooling to Heating ON OFF OFF OFF
Heating to Cooling ON OFF OFF ON
0919.1
Applying New PFD box to KXRE4 Systems
These instructions also apply when replacing existing PFD boxes with PFD***4E PFD Boxes
When replacing a PFD***E or PFD***ER branch control box on a KXRE4 system with the newer style PFD boxes the wiring needs modifying as
KX4 indoor units do not have the CNT2 connection only CNT so the new relay box is incompatible. It is therefore imperative that the existing
relay box is in good condition AND is of the 4 wire type as it will need to be re-used. If the branch control box is a PFD***E it will have the 3 wire
relay box which will need to be replaced with the 4 wire relay box (HRP Code: 631085).
The new PFD box being installed comes with a relay box which needs to be discarded as it is incompatible with the indoor unit. The
interconnecting cable from the PFD box to the relay box will also require modification as their plugs will be different due to the different number
of cables used.
The recommendation is to remove the plug from the new PFD boxes cable and replace it with the plug from the original PFD box modifying the
wire arrangement to suit and insulating the unused Yellow wire.
To remove the plug use a small screwdriver to push the lock pin while pulling the wire.
Keep pulling the wire while pushing the second lock pin until the pin pulls out of the connector housing.
Remove all the pins from the connector housing.
Remove the housing from the wiring looms of both the original PFD box and the new box.
Discard the housing from the new PFD box and insert the pins of the new PFD boxes wiring loom into the
connector housing from the original PFD box as follows
When completed the wiring colours should end up as follows

PFD Box Pin Relay Box
White 1 White
Red 2 Red
Black 3 Black
Blue 4 Blue
Yellow - Not Connected
0919.1
CNT 6 Wire Adaptor
635566
For remotely starting, stopping and monitoring the unit state.
635566 6-Wire Adapter Kit for MHI Indoor Units.

Installation Guide.
This kit provides the wiring connection to the indoor unit printed circuit board (PCB) or an SC-BIKN-E interface to allow remote start/stop control
and basic status monitoring.
Fitting the CnT connector.

Isolate power supply to the indoor unit.
Remove indoor unit electrical panel cover (FD models) or SC-BIKN-E interface cover (SR models).
Locate the blue socket marked CnT on the exposed P.C.B.
Plug the 635566 wiring harness into the CnT socket.
Run the cables so that the terminal block is located in a convenient position outside the control panel.
Connecting Remote Start/Stop, Shown as XR5 on the Diagram

The unit can be controlled by a volt free switch or relay contact (default). If the unit is left in its factory set condition the unit will operate as
follows:-
When the volt free contact closes between terminal 1 (Red) & 6 (Orange) the unit will start, regardless of whether it was running or not, (if the
unit was already running, it will continue to run).
When the contact opens the unit will stop, regardless of whether it was running or not prior to the switch opening.
Remote Indication Relays.

The relays must have 12Volt D.C. coils. The contacts must be rated for the application for which they are being used. For typical low current
switching the following relay may be suitable:-
Supplier: RS Components.
Relay Part. No.: 121-8074
The unit will provide the following outputs:-

Indoor unit operating / Heating mode (not on cooling only units) / Compressor on / Common alarm.
One relay is required for each output.

Determine the number of relays that are required and mount them in a suitable location, as close to the unit as is practical (max. 1.5m).
Link all the positive terminals (A1) of the relay/s together and connect to terminal 1 (Red) on the CnT connection.
Connect the negative terminals (A2) of the relays to the terminal you require.
The terminal functions are as follows:
Indoor unit operating: Connect to the wire no. 2 (Black) Shown as XR1 on the Diagram.
Heating mode: Connect to the wire no. 3 (Yellow) Shown as XR2 on the Diagram.
Compressor run: Connect to the wire no. 4 (Blue) Shown as XR3 on the Diagram.
Common Alarm: Connect to the wire no. 5 (Brown) Shown as XR4 on the Diagram
0919.1
Changing Operation of the CnT connector, 635566’s, On/Off Control.
The On/Off operation characteristics can be changed by either setting Jumper1 and Jumper3 (or SW7-1 and SW7-3 if fitted) on the indoor PCB
or via the “IU Function settings” menu on the wired remote control RC-E5, RC-EX1A or RC-EX3. To make the setting via the wired remote
control please see the remote control installation instructions.
To configure the ON/Off operation via the indoor unit control PCB, (FD models only) see below.
Normal operation, [Default setting], J1 & J3 are intact. (SW7-1 and SW7-3 both on)
When CnT contact 1 to 6 is closed, operation starts, and when it is open operation stops.
Re-start from the remote controller is allowed.
Pulse operation, when J1 is cut & J3 is intact, (SW7-1 off and SW7-3 on).
Each time CnT contact 1 to 6 is pulsed open/closed/open, the operation changes over, (on to off/off to on).
Operation prohibited control (A), when J1 is intact & J3 is cut (SW7-1 on and SW7-3 off).
When CnT contact 1 to 6 is open, the unit will stop and re-start from the remote controller is blocked.
When CnT contact 1 to 6 is closed, the unit remains stopped but re-start from remote controller is allowed.
Operation prohibited control (B), J1 & J3 are cut, (SW7-1 and SW7-3 both off).
When CnT contact 1 to 6 is closed, the unit will auto restart.
To configure the ON/Off operation via the SC-BIKN-E interface PCB, (SR models only) see below.
Normal operation, [Default setting], SW2-1 and SW2-3 both on.

When CnT contact 1 to 6 is closed, operation starts, and when it is open operation stops.
Pulse operation, when SW2-1 off and SW2-3 on.

Each time CnT contact 1 to 6 is pulsed open/closed/open, the operation changes over (on to off/off to on).
Operation prohibited control (A), when SW2-1 on and SW2-3 off.

When CnT contact 1 to 6 is closed, the unit remains stopped but re-start from remote controller is allowed.
Operation prohibited control (B), SW2-1 and SW2-3 both off.

When CnT contact 1 to 6 is closed, the unit will auto restart.
0919.1
KX4, KX6 and KXZE1 Outdoor Unit Service Switch Settings
Enable Backup Operation Power OFF the outdoor unit

(Max 24Hrs Operation) Switch SW3-2 ON
Power UP the outdoor unit
Enable Test Run in Heating Mode SW5-2 OFF then SW5-1 ON
Enable Test Run in Cooling Mode SW5-2 ON then SW5-1 ON
Enable Pump Down Operation Switch OFF all indoor units
(Ends after 15mins or LP < 0.1MPa) Shut outdoor unit Liquid and Discharge Service valves
Switch SW5-3 ON, SW5-2 On then SW5-1 ON
KX Communications Wiring (A/B) Check

The Superlink, A/B, communications wiring can be checked using an Ohm Meter or Multi-Meter.
It is best to do this test on each individual VRF system prior to connection to a central control network and to the whole central control network
once all systems are installed and commissioned.
Once the installation has been completed and with all units connected to the same Superlink (A/B) network, (Indoor units, Outdoor units and
Central Controllers), powered OFF check the resistance, at the outdoor unit and furthest indoor unit, across A and B terminals in Ohms.
If there are more than one system on the site check each system individually. Once all systems are individually checked then check the whole
A/B network.
The result should be within 10% of the following calculations result
INDOOR UNITS Central Controls Outdoor Units Network Resistance

KX4 KX6/KXZE1 Non N Type N Type KX4 KX6/KXZE1
46000 / (( x5 ) + ( x9 ) + ( x5 ) + ( x9 ) + ( x5 ) + ( x9 )) = Ω
Be careful as the A/B network is only 5Vdc
If the result above is ≤ 100Ω then split the Superlink network in 2 or more sections for checking.
If the resistance measured is less than 100Ω check the A/B cable isn’t connected to a mains cable or connected to the remote control X/Y
terminals on an indoor unit.
With no cables connected the resistance of the X/Y terminals on the indoor and outdoor unit PCBs is 4Ω to 5Ω.
0919.1
Compressor Windings Resistances
Testing Method
1) Setup Procedure
a) Turn off the power to the system.
b) Allow the compressor to cool (if it was greater than 30°C)
c) Remove the terminal cover from the compressor and disconnect the wires U, V and W.
d) With your multi-meter set for Ohms (Ω) check the resistances U-V, V-W, U-W.
e) Check the values obtained against the figures in the following lists for the relevant unit / compressor model.
f) Using a Mega meter or the mega Ohms (MΩ) setting on your multi-meter test the resistance
of each compressor terminal to Earth, either on an unpainted part of the compressor body, to
the condensing unit chassis or to an earth terminal in the electrics box.
If you do not have a Mega meter set your multi-meter to the highest resistance
setting available to do the test.
The reading should be greater than 1MΩ on a Mega meter or infinity on a multi meter.
2) Diagnosis
If the any of the terminal to terminal readings read infinity or over range then you have an open
circuit winding.
If any of the terminal to terminal readings are less than 0.1Ω then you have a short circuit in the
compressor windings or water in the compressor oil.
If the reading between the compressor terminal and earth is low, ie measured in Ohms, then the
compressor windings are down to earth
If the reading to earth is not 0Ω or is less than 1 MΩ (or infinity on a multi meter) then you could have moisture in the
system so repeat test f) after running the system for 5-10 minutes. Do not wait for the compressor to cool down for this
second test.
0919.1
RAC Models Compressor Resistance(ohms)
U-V U-W V-W
SRC20HG 2RS127D5AA04 4.023
SRC28HG 2PS146D5BC04 3.941
SRC40HG-1 RM5515ENE7 6.058 3.899 2.159
SRC52HE-2 RM5522GNE4 3.927 2.323 1.604
SRC63HE-2 RM5526GNE4 4.122 2.775 1.347
SRC71HE-2 2JS386D5AB02 1.135
SRC20HG-S RM-B5077MNE 10.878 7.026 3.852
SRC28HG-S 5PS102DAB 7.172 3.309 3.863
SRC40HG-S 5KS150DB 5.735 3.529 2.206
SRC50HE-S1 RM-B5518MNE5 4.136 2.46 1.676
SRC56HE-S1 RM-B5120MNE5 3.927 2.323 1.604
SRC20-35ZJ-S, SRC20-50ZM-S, SRC20-35ZS-S RM-B5077MDE1 1.703
SRC50ZM-S, SRC50ZS-S 5RS132XAB21 1.417 1.435 1.392
SRC63-71ZE-S1 TNB220FLBM1 0.88
SRC63-80ZK-S, SRC63-80ZM-S, SRC60-80ZR-S RM-T5118MDE2 1.154
SRC20-25ZS-W RM-C5077SBE2 4.428
SRC35ZS-W RM-B5077SBE2 1.703
SRC50ZS-W 9RS102XDA21 1.728 1.761 1.705
SRC20-35ZIX-S RM-B5077MDE1 1.703
SRC50-60ZHX-S, SRC50-60ZIX-S 5CS130XGB04 0.953
SRC20-35ZJX-S, SRC20-35ZMX-S RM-B5077MDE1 1.703
SRC40-60ZJX-S 5CS130XGB04 0.953
SRC20-35ZSX-S, SRC20-35ZSX-SA, SRC20-35ZSXH-S RM-T5111MCE2 1.786
SRC40-60ZMX-S, SRC40-60ZSX-S RM-T5113MCE2 0.864
SRC20-60ZSX-W RM-T511111SWE3 1.786
SRC25-35ZJ-SA, SRC20-35ZJP-S, SRC25-35ZJR-S, SRC20-35ZJX-SA,
RM-B5077MDE1 1.703
SRC20-35ZMP-S SRC25-35ZSP-S
SRC45ZMP-S, SRC45ZSP-S GKT128MFA 1.104
DXC09-12Z3-S RM-B5077MDE1 1.703
DXC18Z3-S 5RS132XAB21 1.417 1.435 1.392
SCM40ZG-S 5RS102X 1.047 1.064 1.029
SCM45-48ZG-S 5CS102XFD 0.642 0.636 0.652
SCM60-80ZG-S TNB220FLBMT 0.88
SCM40-50ZJ-S RM-T5113MDE2 1.619
SCM60-80ZJ-S, SCM60-80ZM-S, RM-T5118MDE2 1.154
SCM100-125ZJ-S, SCM100-125ZM-S RM-T5126MDE21 0.293
SCM40-45ZS-S RM-T5111MFE2 1.703
SCM50ZS-S RM-T5113MFE2 1.703
PAC Models Compressor Resistance(ohm)
FDCVA151-251HENR 5CS102XFD 0.643

FDCVA302HENR 2YC45DXD 1.014
FDCVA402-602HENAR, FDCVA402-602HESAR RM-B5125MD11 0.293
FDCVA802-1002HESAR GT-C5150ND79 0.334
FDC71VN 2YC45DXD 1.014
FDC100-140VN RM-T5126MDE2 0.293
FDC100-140VNA RM-T5126MCE3 0.448
FDC100-140VS RM-T5126MDE3 1.172
FDC100-140VSA MCE4SWE2 1.414
FDC200-250VS GT-C5150ND70K 0.334
FDC250VSA GT-C5150NC40KF 0.309
FDC71VNP RM-T5113MDE2 1.619
FDC71VNX, FDC90VNP RM-T5118MDE2 1.154
FDC100VNP RM-T5126MDE1 1.172
FDC100-140VNX RM-T5134MDE2 0.293
FDC100-140VSX, FDC200VSA RM-T5134MDE3 1.172
0919.1
KX Models Compressor Resistance(ohm)
FDCA140HKXEN4R GT-C5139ND50 0.334

FDCA224-335HKXE4R GT-C5150ND74 0.334
FDCA335HKXE4R-K, FDC400-680HKXE4R GT-C5150ND78A 0.334
FDC224-335HKXRE4R GT-C5150ND74 0.334
FDCA335HKXRE4R-K, FDC400-680HKXRE4R GT-C5150ND78A 0.334
FDCA224-335HKXE4BR GT-C5150ND78L 0.334
FDCA224-335HKXE4BR GT-C5150ND75K 0.334
FDCA335HKXE4BR-K, FDC400-680HKXRE4BR GT-C5150ND78A 0.334
FDCA224-335HKXRE4BR GT-C5150ND78L 0.334
FDCA224-335HKXRE4BR GT-C5150ND75K 0.334
FDCA335HKXRE4BR-K, FDC400-680HKXRE4BR GT-C5150ND78A 0.334
FDC112-155KXEN6 RM-T5126MDE21 0.293
FDC112-155KXES6 RM-T5126MDE31 1.172
FDC224-280KXE6, FDC224-280KXZME1 GT-C5150NH40K 0.691
FDC335KXE6, FDC335KXZME1 GT-C5160NH40K 0.691
FDC335KXE6-K, FDC400-560KXE6 GT-C5150NH48L 0.691
FDC560KXE6-K, FDC615-680KXE6 GT-D5160NH48L 0.691
FDC224-280KXE6M GT-C5150MG40K 0.183
FDC335KXE6M GT-D5160MG40K 0.183
FDC335KXE6M-K, FDC400-560KXE6M GT-C5150MG48L 0.183
FDC560KXE6M-K, FDC615-680KXE6M GT-D5160MG48L 0.183
FDC224-280KXRE6 AG-T201A727HB 0.691
FDC335KXRE6 AG-T201A767HB 0.691
FDC335KXRE6-K, FDC400-560KXRE6 AG-T201A827HD 0.691
FDC560KXRE6-K, FDC615-680KXRE6 AG-T201A867HD 0.691
FDCB280KXE6, FDCB280KXE6A GT-C5150NH48L 0.691
FDCB450KXE6 GT-D5160NH48L 0.691
FDCH335KXE6-K FDCH400-560KXE6 GT-C5150NH48L 0.691
FDCH560KXE6 －K, FDCH615-680KXE6 GT-D5160NH48L 0.691
FDC224-280KXZPE1 GT-C5150NC40KF 0.309
FDC280-335KXZE1, FDC224KXZRE1-335KXZRE1 GT-C5150NC47LF 0.309
FDC400-450KXZE1, FDC400-450KXZRE1 GU-C5185ND47V 0.264
FDC475-560KXZE1, FDC475-670KXZRE1 GT-C5150NC47LF (X2) 0.309
PSL/PSH Pressure Transducer Outputs

Take voltage readings as below and compare them with the actual pressure readings, measured using refrigerant gauges.
Wiring of Pressure Transducer Pressure Transducer

Low Pressure High Pressure
PSL PSH
5Vdc Supply Red Red
Common (Gnd) Black Black
Signal / Output Voltage White White

Operating Range (Mpa) 0-1.7 0-4.15
0919.1
Test Procedure – Inverter Checker Compatibility
1. RAC 2. PAC
Model Type (FDC***VN, VS, VNX, VSX)
SRC ZG-S, ZGX-S, SCM ZG-S A Capacity Type
SCM100~125ZJ-S1 B 1Ph 3Ph
SRC40~60ZJX-S, SRC63~80ZK-S 71VN/VNX B
SRC20~50ZJ-S/C, SRC25~60ZJX-S/C C 71~100VNP C
SRC25~45ZJP-S1, SCM40-80ZJ-S/C 100, 125, 140 B B
SRC40~60ZHX, SRC40~60ZIX-S 200, 250 A
SRC20~50ZJ-S, SRC25~35ZJX-S D
SRC25~45ZJP-S, SCM40~80ZJ-S
2. KX
Unit Settings for Inverter Checker Test (FDCA***KXK('R)E4R, FDC***KX('R)E6)
Type A: No special settings required Capacity Type
Type B: Requires dip switch SW10-4 turning ON KX4 KX6
Type C: Connector required to put unit in TEST mode 112, 140, 155 A B
Type D: Not compatible with inverter checker. 224, 280 A B
335 ~680 A B
Inverter Types
Type A: 120° Conduction Control
Type B, C & D: Vector Control
Test Procedure – Using an Inverter Checker

Type A SRC & KX4 Outdoor Units
Testing Method
1) Setup Procedure
b) Remove terminal cover from compressor and disconnect wires U, V and W.
c) Connect disconnected wires to the inverter checker U (Red), V (White) and
W (Black).
2) Operation for Judgement.

a) Turn on the power to the system and start a test run operation in cooling or
heating mode.
b) Check the on/off status of the 6 LED’s of the inverter checker.
c) Judge the Inverter PCB by the ON/OFF status of the 6LED’s of the inverter
checker.
d) Stop the test run within 2 minutes from starting it.
0919.1
Test Procedure – Using an Inverter Checker
Type B - FDC VN, VS, VNA, VSA, VNX, VSX & KX6 Outdoor Units
Testing Method
1) Setup Procedure
c) Connect disconnected wires to an inverter checker U (Red), V (White) and W (Black).
d) Switch JSW10-4 on the outdoor unit’s inverter PCB ON.
Operation for Judgement

2) a) Turn on the power to the system.
b) About 15seconds after power is switched on the LEDs should start to cycle 5 seconds ON/OFF
c) Check the on/off status of the 6 LED’s of the inverter checker.
d) Judge the Inverter PCB by the ON/OFF status of the inverter checkers 6 LED’s
e) Switch OFF JSW10-4 on the inverter PCB once test is complete.
Type C - SRC & FDC VNP Outdoor Units

Testing Method
1) Setup Procedure
c) Connect disconnected wires to the inverter checker U (Red), V (White) and W (Black).
d) With mains power OFF connect a short connector to CNROM on the PCB linking
pins 2 and 3.
SHORT
CONNECTOR
2) Operation for Judgement

a) Turn on the power to the system.
b) About 15seconds after power is switched on the LEDs should start to cycle 5seconds ON/OFF
c) Check the on/off status of the 6 LED’s of the inverter checker.
d) Judge the Inverter PCB by the ON/OFF status of the inverter checkers 6 LED’s
e) Power off and remove short connector from CNROM once test is completed.
0919.1
Test Procedure – 1PH & 3PH Diode Module
“WARNING” Power off the unit, waiting a minimum 3 minutes before removing any applicable wiring. Ensure
to measure that the DC voltage has discharged sufficiently before carrying out the below testing.
1 Phase Diode Module
3 Phase Diode Module
G-K 240V
0919.1
Test Procedure – 3 PH Transistor Module
“WARNING” Power off the unit, waiting a minimum 3 minutes before removing any applicable wiring.
Ensure to measure that the DC voltage has discharged sufficiently before carrying out the below testing.
Measure the resistance of the points shown in the following table using a circuit tester.
P, N, U, V and W are the terminal No. shown in the above drawing.
Tester (+) Tester (-) Result using Multimeter

(Red) (Black) (Resistance)
P N OL / Several 10MΩ
N P Several MΩ
P U OL / Several 10MΩ
P V OL / Several 10MΩ
P W OL / Several 10MΩ
N U Several 100kΩ
N V Several 100kΩ
N W Several 100kΩ
U P Several 100kΩ
V P Several 100kΩ
W P Several 100kΩ
U N OL / Several 10MΩ
V N OL / Several 10MΩ
W N OL / Several 10MΩ
<Judgement>
If the resistance is 0- a few kOhms there is a possibility that the elements are damaged
so replace the power transistor.
0919.1
Test Procedure – Electronic Expansion Valve
“WARNING” Power off the unit,

waiting a minimum 3 minutes Old New
before removing any applicable
wiring.
Ensure to measure that the
DC voltage has discharged
sufficiently before carrying
out the below testing.
Measure the resistance

points as per the
following table by Multi-
meter.
Lead wires = 6 Lead wires = 5
Inner Circuit of EEV Solenoid Coil

If readings are within the
nominated table values,
it is normal.
From To Reference Resistance Old New

White Red 45 - 50 Ohms Yes Yes
Red Orange 45 - 50 Ohms Yes Yes
Orange White 90 - 100 Ohms Yes Yes
Yellow Brown 45 - 50 Ohms Yes not applicable
Brown Blue 45 - 50 Ohms Yes not applicable
Blue Yellow 90 - 100 Ohms Yes Yes
Yellow Red 45 - 50 Ohms not applicable Yes
Red Blue 45 - 50 Ohms not applicable Yes
Blue Yellow 90 - 100 Ohms not applicable Yes
0919.1
DC FAN MOTOR TESTING
Expected Readings of Control PWB VDC Outputs to DCFM Expected Readings of DC Fan Motor Circuit Board
Resistances
Multi Meter Test Points for VDC Multi Meter Test Points for Ω
Multi-meter Red Multi-meter PCB DC Volts Multimeter Multi-meter DCFM PWB Resistance
Probe Black Probe Black Probe Red Probe Value
Vm Gnd # 300 ~ 350 Vdc Vm Gnd # > 1 MΩ
Vcc Gnd # 15 Vdc Vcc Gnd # > 4 KΩ
Vsp Gnd * 2 ~ 7 Vdc Vsp Gnd # > 100 KΩ
Vfg Gnd * 2 ~ 7 Vdc Vfg Gnd
* All Series – Voltages are only present during operation.
# If Resistance Values are ok, confirm with DCFM Tester.
# ZM Series onwards - Voltages are only present Note: If no resistance value is evident, reverse multi-
during operation. meter probes and re-test.
Wiring of DC Fan Motor DC Fan Motor Type
Type A Type B Type C Type D Type E
Motor Power Voltage

Vm Red Red Red Red Red
Input
Gnd Ground Black Blue Blue Black Blue
Control Power Voltage

Vcc White Brown Brown White Brown
Input
Speed Control Voltage
Vsp Yellow Orange Orange Yellow Orange
Input
Revolution Pulse
Vfg Blue White White Blue White
Output
IMPORTANT NOTE: The current version of the DCFM Tool, Part No: RMA006A012A (short/wide model) can run/test
the Type C fan motor. The original version of the DCFM Tool, Part No: RMA006A012
(long/narrow model) cannot run/test the Type C fan motor.

0919.1
Type ‘A’ Fan Motor
Type ‘B’ & ‘C’ Fan Motor
Type “B” Type “C”
Type ‘D’ Fan Motor
Type ‘E’ Fan Motor
0919.1
KX Models
0919.1
THERMISTOR TEMPERATURE & RESISTANCE CHARACHERISTICS
0919.1
TROUBLE SHOOTING REFRIGERATION SYSTEM
Refrigerant Pressure Cause
Location Extra Low Low Normal High Extra High
Excessive refrigerant overcharge
High Side • Non condensibles in the system
Faulty outdoor fan motor
High Side • Blocked outdoor unit heat exchanger
Liquid flooded outdoor heat exchanger
High indoor return air temperature
High Side • Excessive load
Insufficient refigerant
High Side • Gas leak
Blockage
Ineffective compressor compression
High Side • Liquid refrigerant flooding back from indoor unit
Low Side • Bypass valve open
Low Side • Mixture of non condensibles
High indoor return air temperature

Low Side •
High ambient temperature
Low Side • Mixture of non condensibles
Lack of Load
Low Side • Restricted/Blocked liquid line
Low refrigerant charge
Blocked filter
Low Side • Indoor fan fault
Dirty indoor unit heat exchanger
Refrigerant Oils Used

Refrigerant Oil Reference Type Viscosity Viscosity Bottle SAP
@40°C @100°C Volume Code
R32 FW50S PVE 48.42 6.48 -
R32 MB75 POE To Be Confirmed -
R410A FV50S PVE 50.69 6.79 -
R410A FVC68D (SA08145) PVE 66.6 8.04 1.0l -
R410A M-MA32R (SA05317) POE 30.6 0.5l 631091
R410A M-MA32R (SA05316) POE 30.6 4l 631089
R410A M-MA68 (SA08007) POE 68 4l -
0919.1
Refrigerant Piping Information
RAC CURRENT MODELS
Model Precharged Maximum Maximum Vertical Factory Additional Pipe Sizes MCB
Piping Piping Piping Length (m) Charge Charge R410A Liquid Pipe Gas Pipe Rating
Length (m) Length (m) O/D Above I/D Above R410A (kg) per m (g/m) " (mm) " (mm) A
SRC25ZMP-S, 10 15 10 10 0.655 20 1/4" (6.35) 3/8" (9.52) 16
SRC35ZMP-S 15 15 10 10 0.810 N/A 1/4" (6.35) 3/8" (9.52) 16
SRC45ZMP-S 15 25 15 15 1.200 20 1/4" (6.35) 1/2" (12.7) 16
SRC25ZSP-S, 10 15 10 10 0.655 20 1/4" (6.35) 3/8" (9.52) 16
SRC35ZSP-S 15 15 10 10 0.810 N/A 1/4" (6.35) 3/8" (9.52) 16
SRC45ZSP-S 15 25 15 15 1.200 20 1/4" (6.35) 1/2" (12.7) 16
SRC25ZM-S 15 15 10 10 0.750 N/A 1/4" (6.35) 3/8" (9.52) 16
SRC35ZM-S 15 15 10 10 1.050 N/A 1/4" (6.35) 3/8" (9.52) 16
SRC50ZM-S 15 25 15 15 1.350 20 1/4" (6.35) 1/2" (12.7) 16
SRC20_25ZS-S 15 20 10 10 0.750 20 1/4" (6.35) 3/8" (9.52) 16
SRC35ZS-S 15 20 10 10 0.950 20 1/4" (6.35) 3/8" (9.52) 16
SRC50ZS-S 15 25 15 15 1.250 20 1/4" (6.35) 1/2" (12.7) 20
SRC20_35ZMX-S 15 15 10 10 1.200 N/A 1/4" (6.35) 3/8" (9.52) 16
SRC50_60ZMX-S 15 30 20 20 1.500 20 1/4" (6.35) 1/2" (12.7) 16
SRC20_35ZSX-S 15 25 15 15 1.450 20 1/4" (6.35) 3/8" (9.52) 16
SRC50_60ZSX-S 15 30 20 20 1.500 20 1/4" (6.35) 1/2" (12.7) 16
SRC63ZR-S 15 30 20 20 1.550 20 1/4" (6.35) 1/2" (12.7) 16
SRC71ZR-S 15 30 20 20 1.800 25 1/4" (6.35) 5/8" (15.88) 20
SRC80ZR-S 15 30 20 20 1.900 25 1/4" (6.35) 5/8" (15.88) 20
FDC100VNP 15 30 20 20 2.550 60 3/8" (9.52) 5/8" (15.88) 32
SCM Multi Splits

For SCM Systems the maximum one way piping length to an indoor unit is 25 metres.
Length (m) Length (m) O/D Above I/D Above R410A (kg) per m (g/m) " (mm) " (mm) A
SCM40ZS-S 30 30 15 15 1.900 N/A 2x 1/4" (6.35) 2x 3/8" (9.52) 25
SCM45ZS-S 30 30 15 15 1.900 N/A 2x 1/4" (6.35) 2x 3/8" (9.52) 25
SCM50ZS-S 40 40 15 15 2.500 N/A 3x 1/4" (6.35) 3x 3/8" (9.52) 25

SCM45ZM-S 30 30 15 15 2.000 N/A 2x 1/4" (6.35) 2x 3/8" (9.52) 25
SCM60ZM-S 40 40 15 15 2.500 N/A 3x 1/4" (6.35) 3x 3/8" (9.52) 25
SCM80ZM-S 40 70 20 20 3.150 20 4x 1/4" (6.35) 4x 3/8" (9.52) 25

SCM100_125ZM-S 50 90 20 20 6.000 20 5x 1/4" (6.35) 5x 3/8" (9.52) 32
PAC Splits - CURRENT MODELS

Length (m) Length (m) O/D Above I/D Above R410A (kg) per m (g/m) "" (mm) "" (mm) A(/ph)
FDC71VNP 15 30 20 20 1.600 20 1/4" (6.35) 1/2" (12.7) 20
FDC90VNP 15 30 20 20 2.100 20 1/4" (6.35) 5/8" (15.88) 20
FDC100VNP 15 30 20 20 2.550 60 3/8" (9.52) 5/8" (15.88) 32
FDC100VNA 30 50 50 15 3.800 60 3/8" (9.52) 5/8" (15.88) 32
FDC125VNA 30 50 50 15 3.800 60 3/8" (9.52) 5/8" (15.88) 32
FDC140VNA 30 50 50 15 3.800 60 3/8" (9.52) 5/8" (15.88) 32
FDC71VNX 30 50 30 15 2.950 60 3/8" (9.52) 5/8" (15.88) 25
FDC100VNX 30 100 30 15 4.500 60 3/8" (9.52) 5/8" (15.88) 32
FDC125VNX 30 100 30 15 4.500 60 3/8" (9.52) 5/8" (15.88) 32
FDC140VNX 30 100 30 15 4.500 60 3/8" (9.52) 5/8" (15.88) 32
FDC100VSA 30 50 50 15 3.800 60 3/8" (9.52) 5/8" (15.88) 20
FDC125VSA 30 50 50 15 3.800 60 3/8" (9.52) 5/8" (15.88) 20
FDC140VSA 30 50 50 15 3.800 60 3/8" (9.52) 5/8" (15.88) 20
FDC100VSX 30 100 30 15 4.500 60 3/8" (9.52) 5/8" (15.88) 20
FDC125VSX 30 100 30 15 4.500 60 3/8" (9.52) 5/8" (15.88) 20
FDC140VSX 30 100 30 15 4.500 60 3/8" (9.52) 5/8" (15.88) 20
FDC200VSA 30 70 30 15 5.600 60 3/8" (9.52) 7/8" (22.22) 32
FDC250VSA 30 70 30 15 7.200 120 1/2" (12.7) 1-1/8" (28.58) 32
0919.1
Refrigerant Piping Information
Historic Models
Model Precharged Maximum Maximum Vertical Factory Additional Pipe Sizes
Piping Piping Piping Length (m) Charge Charge R410A Liquid Pipe Gas Pipe
Length (m) Length (m) O/D Above I/D Above R410A (kg) per m (g/m) "" (mm) "" (mm)
SRC20_25ZD,ZF,ZG 15 15 10 10 0.900 N/A 1/4" (6.35) 3/8" (9.52)
SRC20_325ZGX-S 15 15 10 10 1.200 N/A 1/4" (6.35) 3/8" (9.52)
SRC20,25ZJ-S 15 15 10 10 0.750 N/A 1/4" (6.35) 3/8" (9.52)
SRC35ZD,ZG 15 15 10 10 1.100 N/A 1/4" (6.35) 3/8" (9.52)
SRC35ZJ-S 15 15 10 10 1.050 N/A 1/4" (6.35) 3/8" (9.52)
SRC20ZJ-S1 15 15 10 10 0.750 N/A 1/4" (6.35) 3/8" (9.52)
SRC25,35ZJ-S1 15 15 10 10 1.150 N/A 1/4" (6.35) 3/8" (9.52)
SRC50ZD,ZG,ZJ-S,ZJ-S1 15 25 15 15 1.350 20 1/4" (6.35) 3/8" (9.52)
SRC20,25,35,ZIX,ZJX-S,ZJX-S1 15 15 10 10 1.200 N/A 1/4" (6.35) 3/8" (9.52)
SRC50,60ZFX,ZGX,ZHX,ZIX 15 30 20 20 1.400 20 1/4" (6.35) 1/2" (12.7)
SRC50,60ZJX-S 15 30 20 20 1.500 20 1/4" (6.35) 1/2" (12.7)
SRC63_71-S,S1 15 30 20 20 1.900 25 1/4" (6.35) 5/8" (15.88)
SRC63,71,80,ZK-S 15 30 20 20 1.800 25 1/4" (6.35) 5/8" (15.88)
SRC63ZM-S 15 30 20 20 1.800 25 1/4" (6.35) 5/8" (15.88)
SRC71_80ZM-S 15 30 20 20 1.800 25 1/4" (6.35) 5/8" (15.88)
SCM45ZG-S 20 30 15 15 1.600 20 2x 1/4" (6.35) 2x 3/8" (9.52)
SCM60ZG-S 30 40 15 15 2.200 20 3x 1/4" (6.35) 3x 3/8" (9.52)
SCM80ZG-S 40 70 20 20 3.150 20 4x 1/4" (6.35) 4x 3/8" (9.52)
SCM45ZJ-S 30 30 15 15 2.000 N/A 2x 1/4" (6.35) 2x 3/8" (9.52)
SCM60ZJ-S,S1 40 40 15 15 2.500 N/A 3x 1/4" (6.35) 3x 3/8" (9.52)
SCM80ZJ-S,S1 40 70 20 20 3.150 20 4x 1/4" (6.35) 4x 3/8" (9.52)
SCM100,125ZJ-S,S1 50 90 20 20 6.000 20 5x 1/4" (6.35) 5x 3/8" (9.52)
FDCVA151,201HEN 30 40 30 15 1.550 20 1/4" (6.35) 1/2" (12.7)
FDCVA251HEN 30 40 30 15 1.750 20 1/4" (6.35) 5/8" (15.88)
FDCVA302HENR,AR 30 50 30 15 2.950 60 3/8" (9.52) 5/8" (15.88)
FDCVA402_602HENR,AR 30 50 30 15 3.800 60 3/8" (9.52) 5/8" (15.88)
FDC71VN 30 50 30 15 2.950 60 3/8" (9.52) 5/8" (15.88)
FDC100VN 30 50 30 15 3.800 60 3/8" (9.52) 5/8" (15.88)
FDC125VN 30 50 30 15 3.800 60 3/8" (9.52) 5/8" (15.88)
FDC140VN 30 50 30 15 3.800 60 3/8" (9.52) 5/8" (15.88)
FDC100VS 30 50 30 15 3.800 60 3/8" (9.52) 5/8" (15.88)
FDC125VS 30 50 30 15 3.800 60 3/8" (9.52) 5/8" (15.88)
FDC140VS 30 50 30 15 3.800 60 3/8" (9.52) 5/8" (15.88)
FDC200VS 30 70 30 15 5.400 60 3/8" (9.52) 7/8" (22.22)
FDC250VS 30 70 30 15 7.200 120 1/2" (12.7) 7/8" (22.22)
Note: If the one way pipe length is less than 3m remove refrigerant from the system pre-charge
SRC20- 80 Models – 200g
FDC71-90VNP Models – 200g
FDC100VNP Model – 600g
FDC71-200 Models – 1500g
FDC250VS Model - 2400g
0919.1
KX SYSTEM REFRIGERANT CHARGE CALCULATION
KX4 VRF Systems
The additional charge to be added for local refrigerant piping is calculated as follows:
Required Charge( R) = { ( l1 x 0.022) + (l2 x 0.054) + (l3 x 0.11) + (l4 x 0.17) + (l5 x 0.25) ( l6 x 0.35) } x A
Additional R410A Charge (L) for Liquid Line Lengths

Liquid Line Diameter Inches 1/4" 3/8" 1/2" 5/8" 3/4" 7/8"
Liquid Line Diameter mm 6.35 9.52 12.70 15.88 19.05 22.20
Additional Charge kg/m c 0.022 0.054 0.110 0.170 0.250 0.350
Liquid Line Length l l1 l2 l3 l4 l5 l6
Additional Charge per line C l1 x c1 l2 x c2 l3 x c3 l4 x c4 l5 x c5 l6 x c6

Total Additional Charge for L
C1 + C2 + C3 + C4 + C5 + C6 kg
Liquid Lines
3 Pipe Systems Correction Coefficient (A)

Outdoor Unit Capacity FDCA140-1360KXE4 FDCA224-680KXRE4 FDCA735-1360KXRE4
Correction Factor A 1 1.3 1.2
Additional R410A Required R TxA kg
Total System Charge of R410A

The Systems total refrigerant charge is calculated as follows:
System Charge = U + [ { ( l1 x 0.022) + (l2 x 0.054) + (l3 x 0.11) + (l4 x 0.17) + (l5 x 0.25) ( l6 x 0.35) } x A ]
Supplied Refrigerant Charge (U)

Model Factory
Charge U
FDCA140-160KXE4 7.5 kg
FDCA224-335KX(R)E4 14.2 kg
FDCA335HKX(R)E4-K, FDCA400-450KX(R)E4 17.0 kg
FDCA504-560HKX(R)E4 19.4 kg
FDCA615-680HKX(R)E4 26.2 kg
TOTAL SYSTEM CHARGE R410A R+U kg
0919.1
KX6 MICRO and MINI VRF Systems
The Additional Charge calculation is as follows:
Additional Charge = S + { ( l1 x 0.022) + (l2 x 0.054) + (l3 x 0.110) + (l4 x 0.170) }

Liquid Line Diameter Inches 1/4" 3/8" 1/2" 5/8"
Liquid Line Diameter mm 6.35 9.52 12.70 15.88
Additional Charge kg/m c 0.022 0.054 0.110 0.170
Liquid Line Length l l1 l2 l3 l4
Additional Charge per line C l1 x c1 l2 x c2 l3 x c3 l4 x c4
Total Additional Charge for L

C1 + C2 + C3 + C4 kg
Liquid Lines
Standard (S) Additional Charge

Model Standard Additional
Charge S
FDC112-155KXE6 (Convert Pre Charge to 3.38kg Base Charge) -1.62 kg
FDC224-335KXE6 0.0 kg
TOTAL ADDITIONAL CHARGE R410A R S+L kg

The total System charge calculation is as follows
System Charge = U + S + { ( l1 x 0.022) + (l2 x 0.054) + (l3 x 0.11) + (l4 x 0.17) }

Model Factory
Charge U
FDC112-155KXE6* 5.0 kg
FDC224-336KXE6 11.5 kg
TOTAL SYSTEM CHARGE R410A T U+R kg
0919.1
KX6 VRF Systems
The Additional Charge calculation is as follows:
Additional Charge = I + S + [ { ( l1 x 0.022) + (l2 x 0.054) + (l3 x 0.12) + (l4 x 0.18) + (l5 x 0.26) ( l6 x 0.37) } x A]

Liquid Line Diameter Inches 1/4" 3/8" 1/2" 5/8" 3/4" 7/8"
Liquid Line Diameter mm 6.35 9.52 12.70 15.88 19.05 22.20
Additional Charge kg/m c 0.022 0.059 0.120 0.180 0.260 0.370
Liquid Line Length l l1 l2 l3 l4 l5 l6
Additional Charge per line C l1 x c1 l2 x c2 l3 x c3 l4 x c4 l5 x c5 l6 x c6

Total Additional Charge for L Liquid
C1 + C2 + C3 + C4 + C5 + C6 kg
Lines
3 Pipe Systems Correction Coefficient (A)

Outdoor Unit Capacity FDC400-1360KXE6 FDC224-1360KXRE6
Correction Factor A 1 1.4
ADDITIONAL CHARGE R410A P L xA kg
IMPORTANT
If the additional Charge (P) exceeds the following charges the system MUST be split:
Model Additional
Charge P
FDC224-680KXRE6 50.0 kg
735-1360KX(R)E6 100.0 kg
Standard (S) Additional Charge

Model Standard Additional
Charge S
FDC224-335KXRE6 0.0 kg
FDC400KX(R)E6 1.3 kg
FDC450KXE(R)6 3.1 kg
0919.1
Additional Charge (I) for Indoor Units
Indoor Unit Capacity F Sum of indoor unit model numbers i.e FDT112KXE6F
Outdoor Unit Capacity O i.e FDC1360KXRE6
Additional Charge for Indoor I

{ F - (O x 1.3) } x 0.01
Unit Loading if (F-(Ox1.3))>0
TOTAL ADDITIONAL CHARGE R410A R I+S+P kg

The total System charge calculation is as follows
System Charge = U + I + S + [ { ( l1 x 0.022) + (l2 x 0.059) + (l3 x 0.12) + (l4 x 0.18) + (l5 x 0.26) ( l6 x 0.37) } x A ]

Model Factory
Charge U
FDC224KXRE6 8.7 kg
FDC280KXRE6 9.9 kg
FDC335KXRE6 11.4 kg
FDC400-680KX(R)E6 11.5 kg
FDC735-1360KX(R)E6 23.0 kg
TOTAL SYSTEM CHARGE R410A U+R kg
Calculating CO2 Equivalent

The fgas Leak Check thresholds expressed in weight of refrigerant have been replaced, in the new fgas
regulations by thresholds expressed in tonnes of CO2 equivalent quantities.
For R401A the tonnes CO2 equivalent is calculated by multiplying the total system charge weight (T) by 2.088
Refrigerant R32 R410A

GWP Factor G 0.675 2.088
Tonnes CO2 Equivalent T xG
Leak Inspection Frequency (R32) No Leak Detection System Leak Detection System Fitted
Less than 7.41kg R32 No Leak Check No Leak Check
7.41kg R410A / 5 tonnes CO2 equiv. 12 Months 24 Months
740.74kg R410A / 500 tonnes CO2 equiv. Mandatory Leak detection 6 Months
Leak Inspection Frequency (R410A) No Leak Detection System Leak Detection System Fitted
Less than 2.39kg R410A No Leak Check No Leak Check
239.4kg R410A / 500 tonnes CO2 equiv. Mandatory Leak detection 6 Months
0919.1
MHI Product Support
Tel: 03301 235 598
Email: support@mhitechnical.co.uk
0919.1

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SERVICE

Technical Assistance is available Monday to Friday

Remote Controls - Floor Console Split & Multi Split Systems

Remote Controls - Ducted Multi Split Systems

Remote Controls - Cassette Multi Split Units

Red light flashing and Blank display

Filter Clean Indication

Details of 33 Compressor Protection Status

Operation Data Description and RAC Unit Compatibility

Details of 33 Compressor Protection Status

0.5s / 0.5s - - - - Inval id Opera tion (SCM mults pli t)

3.5s / 0.5s - - - - Auto OFF duri ng Sta nd By

- ON - - - Ti mer Mode Active (ON/OFF/Weekly/Sleep)

6x ON - E16 Indoor fa n motor error Fa ult i ndoor fa n motor, poor connection

Refri gera ti on s ys tem protective

Compres s or l ocking, open pha s e on compres s or output, s hort circuit on power

ON 4x 1x E51 Power Tra ns i s tor error Fa ulty power tra ns is tor

ON 7x ON E48 Fa ulty outdoor fa n motor Fa ulty condens er fa n motor, poor connecti on

Inverter Multi Outdoor SCM ZJ-S, ZJ-S1, ZM-S, ZS-S

Indoor Unit Display Outdoor Wired Description of Trouble Possible Cause

3s / 1s - - - - Clean Mode Active

3.5s / 0.5s - - - - Auto OFF during Sta nd By

- ON - - - Timer Mode Active (ON/OFF/Weekly/Sleep)

Refrigerant cycle system protectiv e

Compressor locking, open phase on compressor output, short circuit on power

ON 3x 3x E58 Current safe stop Ov erload protection, ov er charged, compressor locking

Ov erload protection, ov er charged, broken outdoor heat exchanger sensor

1x ON OFF E6 Broken heat exchanger sensor (1) wire, poor connection

5x ON OFF E6 Broken heat exchanger sensor (2) wire, poor connection

ON 4x 4x E41 Power transistor error Broken power transistor

Service mode display procedure

Turn off the A/C's power, and then

Turn the A/C \'s power back on while

Within 1 minute after turning the A/C back on, signals

Turn off the A/C's power to terminate the

Change the remote controls settings based

• In the case of current cut (example: stop code “42”)

Remote Control Information Tables

Operation switching Fan Speed Switching

3 -60 -62 -64

• EXAMPLE - Outdoor air sensor temperature “42 ºC”

No Buzzer, Run light x 4, Timer light x 2.

Power supply is faulty. W hen the power supply v oltage

Cannot receiv e signals W hen 35 sec passes without

E19 1x Flashing Off Flashing Mode Setting Incorrect mode setting

Inverter PAC Outdoor SRC ZHX-S, ZIX-S, ZJX-S, ZMX-S, ZSX-S

Installation, operation status Higher discharge temperature

E60 Off Flashing 7x Compressor Anomalous compressor rotor lock

RED GREEN (1) RED GREEN (1) INV LED

SYSTEM TYPE Master/Slave PAC Indoor Units SC-BIKN-E Interface

2 FDT FDC Quad Master SW2 1 SW5 OFF OFF

3 SRK FDC Twin Master SW1 2 SW3 OFF OFF

4 FDUM FDC Split Master SW2 3 SW5 OFF OFF

Note: figures in brackets ( ) relate to SC-BIKN2-E interface

3. Check the VOLTAGE between terminals

4. Check the VOLTAGE DC between

5. On the outdoor unit terminal block check the VOLTAGE DC between

Check the LEDs on the outdoor unit PCB