Vaillant Aqua Plus Installation & Servicing Manual
Vaillant Aqua Plus Installation & Servicing Manual
Vaillant Aqua Plus Installation & Servicing Manual
aquaPLUS
VUI 362-7
GB
Table of Contents
Page
1 List of Contents . . . . . . . . . . . . . . . . . . . . . . . . .
1.1
Contents included with boiler . . . . . . . . . . . . . .
1.2
Installation accessories . . . . . . . . . . . . . . . . . . .
3
3
3
2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1
General Information . . . . . . . . . . . . . . . . . . . . .
2.2
General Notes . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3
Showers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4
EC designation . . . . . . . . . . . . . . . . . . . . . . . . . .
4
4
4
4
4
3 Boiler Specification . . . . . . . . . . . . . . . . . . . . . .
3.1
Technical data . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
Boiler connections . . . . . . . . . . . . . . . . . . . . . .
3.3
Functional Diagram . . . . . . . . . . . . . . . . . . . . . .
5
5
6
7
4 General Requirements . . . . . . . . . . . . . . . . . . . .
4.1
Preliminary remarks . . . . . . . . . . . . . . . . . . . . .
4.2
Related Documents . . . . . . . . . . . . . . . . . . . . . .
4.3
Boiler location . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4
Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5
Flue system . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.1 Top outlet flue system (100 mm outside
diameter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.2 Extended top outlet flue system (125 mm
outside diameter) . . . . . . . . . . . . . . . . . . . . . . .
4.5.3 Flue termination . . . . . . . . . . . . . . . . . . . . . . . .
4.6
Air supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.7
Cupboard or compartment ventilation . . . . . .
4.8 Electrical supply . . . . . . . . . . . . . . . . . . . . . . . . .
4.9
Guide to system requirements . . . . . . . . . . . . .
4.9.1 Water circulation system . . . . . . . . . . . . . . . . . .
4.9.2 Filling and make up . . . . . . . . . . . . . . . . . . . . . .
4.9.3 Pressure relief valve (central heating) . . . . . . .
4.9.4 Pressure relief valve (hot water) . . . . . . . . . . .
4.9.5 Pressure gauge . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.6 Expansion vessel . . . . . . . . . . . . . . . . . . . . . . . .
4.9.7 Pump specifications . . . . . . . . . . . . . . . . . . . . .
4.9.8 Circulating pump . . . . . . . . . . . . . . . . . . . . . . . .
4.9.9 System by-pass . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.10 Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
8
8
8
8
9
9
9
10
11
11
11
11
11
11
11
11
11
12
12
12
12
12
Page
5.16
5.17
5.18
5.19
5.20
Frost protection . . . . . . . . . . . . . . . . . . . . . . . . .
Circulating pump . . . . . . . . . . . . . . . . . . . . . . . .
Anti-cycling economiser control . . . . . . . . . . .
Automatic pump spin control (APS) . . . . . . . .
Anti legionella protection . . . . . . . . . . . . . . . . .
22
22
22
22
22
6 Commissioning Part I . . . . . . . . . . . . . . . . . . . .
6.1
Preliminary electrical checks . . . . . . . . . . . . . .
6.2
Gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3
Cold water supply . . . . . . . . . . . . . . . . . . . . . . .
6.4
Filling the heating system . . . . . . . . . . . . . . . . .
6.5
Initial system flush ("cold") . . . . . . . . . . . . . . . .
23
23
23
23
23
23
24
24
25
26
27
28
30
30
31
32
32
32
32
33
33
33
34
34
9 Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . .
9.2
Functional check of boiler operation . . . . . . . .
9.3
Cleaning the burner and primary heat
exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.4
Draining the domestic hot water system . . . . .
34
34
34
10 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.2 Logical fault finding procedure . . . . . . . . . . . .
10.2.1 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.3 Status Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.4 Diagnostic Modes . . . . . . . . . . . . . . . . . . . . . . . .
10.5 Fault codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.6 Fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
36
36
37
38
39
41
41
35
35
11 Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
11.1
Functional Flow diagram:
aquaPLUS VUI 362-7 . . . . . . . . . . . . . . . . . . . . . 49
11.2
Wiring diagram: aquaPLUS . . . . . . . . . . . . . . . . 50
12 Short parts list
List of Contents 1
1 List of Contents
12
1
2
11
11
11
o
C
VRC-VC
o
C
I
0
10
9
8
7
5
6
Fig. 1.1: Items supplied with unit
Item
Quantity Description
1
2
3
4
1
1
1
1
5
6
1
3
7
8
9
10
5
1
2
1
11
12
Boiler
Flue restriction ring
Controls cover door
Lower cover plate (packed in bottom
packaging)
Cold water inlet valve
Flow and return service value, gas service
valve
Copper tails for gas and water pipework
Template
Guarantee Card and Benchmark log book
Installation and connection accessories and
PRV packages incl. DHW outlet union nut
Installation and Servicing, Users and Flue
Installation Instructions
Hanging bracket
2 Introduction
2 Introduction
aquaPLUS boiler
The aquaPLUS is a fully automatic, wall mounted, room
sealed combination boiler for central heating and
domestic hot water. The boiler has an integrated 15 litre
stainless steel power store for enhanced domestic hot
water delivery. Domestic hot water is supplied directly
from the boiler, without requiring a copper cylinder, cold
water tank, feed and expansion tank and associated
pipework. Domestic hot water has priority over central
heating.
The aquaPLUS boiler has an output for domestic hot
water of 36.9 kW. The appliance is available in natural
gas only.
aquaPLUS combination boilers incorporate a pre-heat
facility that keeps the power store hot, providing an
instantaneous delivery of domestic hot water.
The temperature in the domestic power store is limited
by the boiler control system and it is not necessary to
install a scale reducer on the cold mains to the boiler.
However, in exceptionally hard water areas to prevent
scale formation in the property hot water system
pipework, a scale reducer may be fitted.
The heating system can be filled using the built-in filling
loop contained within the boiler.
No asbestos, mercury or CFC's are included in any part
of the boiler.
2.3 Showers
Only thermostatically controlled showers must be fitted
with aquaPLUS boilers to guard against the flow of
water at too high a temperature and to ensure constant
shower outlet water temperatures.
The data badge is fitted on the rear of the control panel.
See text of General Requirements for installation
requirements or notes.
2.4 EC designation
aquaPLUS boilers carry the "CE" Mark. This
demonstrates that the boilers fulfil the essential
requirements of the Gas Appliance Directive
(90/396/EEC) and the Gas Appliance (Safety)
Regulations 1992.
The "CE" Mark also demonstrates that the boilers
comply with the requirements of the Electromagnetic
Compatibility Directive (89/336/EEC), the Low Voltage
Directive (72/23/EEC), the Boiler Efficiency Directive
(92/42/EEC) and the Boiler (Efficiency) Regulations
1993.
Boiler Specification 3
3 Boiler Specification
3.1 Technical data
aquaPLUS
VUI 362-7
Units
35.2
10.5 - 32.0
40.5
36.9
15.1
13.7
0.7
>0
0.1
6
20
37.8
11.0
1.1
4.3
35 - 82
1375
250
0.75
3.0
***
kW
kW
kW
kW
l/min
l/min
bar
l/min
bar
bar
mbar
MJ/m3
mbar
mbar
m3/h
C
l/h
mbar
bar
bar
l/10 min
bar
l/min
kg
l
V/Hz
A
mm
mm
mm
201
6
20.1
56/76
2.0
240/50
3
800
440
497
3 Boiler Specification
Key:
1
Heating system return (22 mm tail)
2
Cold water connection with shut off valve (15 mm
tail)
3
Gas connection (22 mm tail)
4
Hot water connection (15 mm tail)
5
Heating system flow (22 mm tail)
6
Flue outlet (100 mm flue with turret)
7
Hanging bracket
Key:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
310
122
4 3
35
100
35
100
180
130
780
Air duct
Fan
Power store
Main heat exchanger
Temperature sensor (NTC I)
Temperature sensor (NTC III)
Diverter valve
DHW pressure relief valve
Temperature sensor (NTC IV)
DHW heat exchanger
DHW expansion vessel
DHW pump
Automatic bypass valve
CH flow service valve
Hot water outlet
Gas service valve
Cold water service valve
CH return service valve
Filling loop
Pressure relief valve
Aqua sensor (DHW flow switch)
Expansion vessel
Electronic box
Fully modulating automatic gas value
Circulating pump
Automatic air vent
Modulating burner
Temperature sensor (NTC II)
Air pressure switch
Flue gas duct
Boiler Specification 3
30
29
28
5
6
27
7
8
26
25
24
10
23
11
22
21
12
13
20
19
14
18
15
17
16
4 General Requirements
4 General Requirements
4.1 Preliminary remarks
This appliance should only be installed in conjunction
with a Vaillant flue system.
Install the flue system as detailed in the separate flue
installation instructions supplied with this boiler.
4.2 Related Documents
The installation of the boiler must be in accordance with
the relevant requirements of Gas Safety (Installation
and Use) Regulations 1998, Health and Safety Document
No. 635 (The Electricity at Work Regulations 1989),
BS7671 (IEE Wiring Regulations) and the Water Supply
(Water Fittings) Regulations 1999, or the Water Bylaws
2000 (Scotland). It should also be in accordance with
the relevant requirements of the Local Authority,
Building Regulations, Building Regulations (Scotland),
Building Regulations (Northern Ireland) and the relevant
recommendations of the following British Standards,
including current amendments to Approved Documents
Part L and J:
BS 5440: Flues and ventilation of gas fired boilers not
exceeding 70 kW net:
- Part 1: Flues
- Part 2: Ventilation
BS 5449: Specification for forced circulation hot water
for domestic premises.
BS 5546: Specification for gas hot water supplies for
domestic premises.
BS 6700: Services supplying water for domestic use
within buildings and their curtilages.
BS 6798: Specification for installation of gas fired
boilers not exceeding 70 kW input.
BS 6891: Specification for installation of low pressure
gas pipework up to 28 mm (R1) in domestic premises
(2nd family gas).
BS 7593: Treatment of water in domestic hot water
central heating systems.
Institute of Gas Engineers Publication IGE/UP/7/1998:
Guide for Installation in Timber Framed Housing.
Benchmark Code of Practice, Building Regulations
Approved Documents Part L 2002, Part J 2002.
General Requirements 4
1103
70
15
750
70
48
48
48
603
1285
4 General Requirements
A
G
B F
G
BCD
H,
A
A
E
M
L
K
L K
A
G
mm
300
25
Below eaves
25
25
25
25
600*
1200
1200
300
into a dweling
10
1500
300
500
General Requirements 4
11
4 General Requirements
700
Lift [mbar]
650
600
550
500
450
400
350
300
250
200
150
100
50
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
2.7
3.9
50
5.4
7.8
100
10.9
15.6
125
13.6
19.5
150
16.3
23.4
175
19.1
27.3
200
21.8
31.2
225
24.5
35.1
250
27.2
39.0
275
30.0
42.9
300
32.7
46.8
325
35.7
50.7
350
38.1
54.6
375
40.9
58.5
400
43.6
62.4
425
46.3
66.3
450
49.0
70.2
475
51.8
74.1
500
54.5
78.0
0.109
0.156
4.9.10 Venting
The boiler is fitted with an automatic air vent. Additional
provision should be made to enable the heating system
to be vented during filling and commissioning either by
automatic air vents or manually.
12
500
440
800
150
497
13
2
60/100
> 210
122
30,5
12,5
780
08/2001
124175 GB
14
90
90
VRC-VC
I
0
I
0
15
I
0
I
0
3
4
1
6
1
2
7
3
8
16
I
0
1
2
9
3
6
7
17
Warning!
Mains connection terminals L and N remain live
even when the boiler on/off control is switched
off.
18
7 8 9
L N
3 4 5
RT 24V
230V
RT 230V
19
F3
7 8 9
24V
Do not use!
L N
3 4 5
230V
F1
Fig. 5.11: Connection wiring
20
5.14 Controls
External electrical controls
The boiler terminals 3, 4 and 5 are for connecting
external electrical controls such as a time switch and/or
room thermostat.
Terminals 3 and 4 are linked together when the boiler is
supplied. If external controls are used, this link must be
removed, and the controls connected across terminals 3
and 4.
Terminal 5 is an additional neutral connection for
external neutrals such as from the anticipator of a room
thermostat.
L
L
ACL Drayton
Digistat 2, 3, 4
N
N
2
3
ACL Drayton
Digistat RF - SCR Receiver
Danfoss Randall
TP75
Grsslin Towerchron
RTC7
L1
Smiths Timeguard
ProgramaSTAT PRT11, PRT17
L
Sunvic
TLX 6501
1
3
Vaillant
VRT 220, 230
ACL Drayton
Switchmaster 980
Danfoss Randall
103 Series
Danfoss Randall
Set 1E, TS975
5
4
Sunvic
TLX RFP, TLX RFD
Grsslin Towerchron
QE1, QM1
ACL Drayton
Switchmaster
SM300
3
Horstmann
Centaurstat 1, 7
3
3
4
2
3
2
Horstmann
Channel Plus
H11, H17, 425 Coronet
Horstmann
Centaur Plus
C11, C17
Potterton Myson
EP 4002, EP 5002
Smiths Timeguard
SupplyMASTER
FST11, FST17
1
4
Sunvic
Select 107
4
1
2/L 1/N
2
3
B
3
6
Honeywell
ST610A, ST6100C
3
A
Danfoss Randall
TS715
Honeywell
CM61, CM67, CM31, CM37
Danfoss Randall
TP5E RF with receiver RX1
3
4
Danfoss Randall
TP4, TP5, TP5E
ACL Drayton
Tempus 1, Tempus 2
Lyfestyle LP111, LP711
mains supply
21
20 VDC
7 8 9 L N
MAINS
SUPPLY
230 V
50 Hz
N
L
3 A FUSE
34 5
SWITCH
CONTACTS
L
N CLOCK
ROOM
THERMOSTAT
Fig. 5.14
22
Commissioning Part I 6
6 Commissioning Part I
6.1 Preliminary electrical checks
Check the electrical installation by carrying out short
circuit, earth continuity and resistance to earth tests
and a check for correct polarity.
1
2
90
23
24
1a
2a
25
I
0
Warning!
The plastic cap (2)must be fitted for the gas
valve assembly to function correctly.
Turn off the hot water tap.
To cancel selected "P1" or "P2" mode press the "i"
and "+" buttons simultaneously.
10
26
I
0
Warning!
The main burner pressure must be rechecked
after adjusting the ignition rate.
Refit cap (1) and replace screw. Re-check ignition and
main burner pressures. After completion of these tests
tighten the sealing screw and check all joints and test
points for soundness.
27
Warning!
DO NOT open any hot water tap while carrying
out this procedure.
Check that the U-gauge reading corresponds to the
maximum burner pressure as detailed on the table.
Adjust central heating output range as shown on page
29.
Fig. 7.5: Using nozzle pressure to check and adjust the heating
system partial load
28
5 After setting, press and hold the "i" button for five
seconds or until the display stops flashing. The new
setting value is now memorised. The new main burner
pressure can now be checked. If the new output is not
correct repeat steps 3 to 5.
~5s
29
5.3 mbar
15.3 mbar
position.
Continue holding + button until display starts to
alternate between the P numbers (P1,P2,P3,P11,P12
and P13).
Release + button..
Press + button until P11 ((or natural gas)or "P 13"
(for LPG) is shown in display.
Press i button to operate boiler at mid setting point.
The mid setting point burner pressure is now adjusted
by pushing the "+"button until the gauge equals the
pressure as detailed in the table below.
Program No.
Gas type
P.11
Natural Gas
5.3 mbar
(G20)
Not applicable for GB
LPG (G30/31) 15.3 mbar
P.12
P.13
Note!
The "-" button has no function in this mode, if the
required pressure is exceeded during set up, this
operation should be recommenced from the
beginning.
When the pressure is correct, to save the setting to
memory, press and hold the "i"button until the display
stops flashing.
To cancel selected mode press the "i"and "+"buttons
simultaneously.
Re-check ignition and main burner pressures.After
completion of these tests tighten the sealing screw and
check all joints and test points for soundness.
10.5 12.0 16.0 18.0 20.0 24.0 28.0 30.0 33.0 36.9
1.1
1.1
1.4
2.4
2.9
3.6
5.0
6.7
7.5
9.0
11.0
mark2) 7/120
L.P.G. 3+
2.8
2.8
3.5
5.9
7.3
1)
3.5
3.5
4.4
7.3
9.1
11.1
mark2) 7/072
Output [kW]
10,5 12,0 16,0 18,0 20,0 24,0 28,0 30,0 33,0 36,9
Gas rate1) [m3/h] for G20
1.3
1.4
1.9
2.2
2.4
2.8
3.3
3.5
3.9
4.3
mark2) 7/120
1)
2)
30
1
2
90
90
VRC-VC
I
0
31
I
0
32
33
Servicing 9
9 Servicing
9.1 Initial Inspection
To ensure the continued safe and efficient operation of
the boiler it is recommended that it is checked and
serviced as necessary at regular intervals. The
frequency of servicing will depend upon the particular
installation conditions and usage, but in general once
per year should be adequate. It is the law that all
servicing work is carried out by a competent person
(Corgi registered).
Important: Before starting any maintenance work:
Isolate the mains electricity supply by disconnecting
the plug at the socket outlet (if there is only an
isolating switch remove the fuse from the switch).
Turn OFF the gas supply at the gas service valve fitted
to the boiler.
Always test for gas soundness and always carry out
functional checks after any service work and after
exchanging any gas carrying component.
Always check earth continuity, polarity and resistance
to earth with a multimeter after any service work and
after exchanging any electrical component.
Note: The boiler is fitted with a combustion analysis
test point on the combustion chamber cover. A suitable
combustion analyser can be connected to this point to
establish the combustion performance of the boiler.
Note: Leave the Benchmark Log Book with the end user.
34
Servicing 9
2a
4
4
5
5
10
9
7
35
10 Fault finding
10 Fault finding
10.1 Introduction
The aquaPLUS boilers have an inbuilt advanced
multifunction diagnostic display to assist with fault
finding in the unlikely event of a boiler malfunction.
The display features the following four modes:
Normal Mode
Under normal conditions the boiler display will show the
boiler flow temperature, this indicates that the boiler is
operating correctly after an internal self check.
Status Mode
The status display is helpful in diagnosing faults where a
fault code is not displayed.
3 4 5 6
o
C
VRC-VC
o
C
I
0
Diagnostic Mode
In order to assist with the pinpointing of a particular
fault it is possible to use the boiler display in a
diagnostic mode to interrogate the boiler about the
status of certain components.
Fault Mode
Should a fault develop in the boiler the display will show
a fault code indicating what the problem may be.
Display key:
1 Fan speed malfunction
2 Heating demand
3 Hot-water demand
4 Power store on (Comfort mode)
5 Pump on
6 Gas valve on
7 Actual Heating-system flow temperature (e.g. 50 C)
or
Displaying of a status/error code
8 Correct burner operation (normal flame) or
lock out (crossed-out flame)
36
Fault finding 10
10.2.1 Procedure
Note: Always check the operation of the boiler for
central heating first before checking hot water
operation. Do not open a hot water tap unless
instructed to do so by the fault finding guide.
1. If a fault code is showing in the boiler display follow
the fault finding charts referring also to the fault code
and diagnostic mode tables.
2.If the boiler is not functioning correctly and a fault
code is not showing in the boiler display follow the
fault finding charts referring also to the status mode
table.
3.Note: If the boiler display is completely blank
initially check the two fuses (Isolate the electrical
supply before checking the fuses, spare fuses are
located on the inside of the control box rear cover).
To access the various modes press the buttons on the
control panel as follows:
Mode
Status mode
mode
37
10 Fault finding
Display
Indication
S.00
S.01
S.02
S.03
S.04
S.05
S.06
S.07
S.08
S.10
S.11
S.13
S.14
S.15
S.16
S.17
S.20
Store recharging
S.21
S.23
S.24
S.25
S.26
S.27
S.28
S.30
S.31
S.32
Main heat exchanger anti freeze protection due to fan speed deviation too great
S.33
S.34
S.36
S.39
S.53
S.54
Delay mode due to flow temperature gradient too steep (approx 10 mins.)
38
Fault finding 10
Display
Indication
d.00
0....30
d.01
d.02
flow temperature
d.03
in C
d.04
in C
d.05
in C
d.06
in C
d.08
d.10
Pump status
1 = on, 0 = off
d.11
1 = on, 0 = off
d.12
d.13
1 = on, 0 = off
d.21
Flame rectification
1 = on, 0 = off
d.22
1 = on, 0 = off
d.23
1 = winter, 0 = summer
d.24
1 = on, 0 = off
d.25
1 = on, 0 = off
d.30
1 = on, 0 = off
d.33
r.p.m.
d.34
r.p.m.
d.35
d.37
Modulator current
in mA
d.40
in C
d.41
in C
d.50
in C
d.60
d.61
d.64
in s
39
10 Fault finding
Display
Indication
d.65
in s
d.67
in min
d.68
d.69
d.71
0 = 82 C, 1 = 87 C (factory-adjustment: 82 C)
temperature
d.72
0, 1, 2, .....250 s (factory-adjustment: 80 s)
d.76
d.79
1 = no, 0 = yes
d.80
in h
d.81
in h
d.82
d.83
40
Fault finding 10
F.01
F.02
F.03
F.10
F.11
F.12
F.13
F.20
F.22
F.23
F.24
F.27
F.28
F.29
F.32
Indication
Flow-NTC: NTC broken; NTC cable broken;
Defective connection at NTC, Defective connection
at electronics
Return NTC: NTC broken; NTC cable broken;
Defective connection at NTC, Defective connection
at electronics
DHW-NTC: NTC broken; NTC cable broken; Defective
connection at NTC; Defective connection at
electronics
Tank-NTC: NTC broken; NTC cable broken; Defective
connection at NTC; Defective connection at
electronics
Short circuit - flow-NTC (<130 C)
Short circuit - return-NTC (<130 C)
short circuit DHW- NTC
short circuit tank- NTC
Over heat cut off activated
Dry fire protection
Dry fire protection (difference between flow and
return NTC's too large)
Dry fire protection (temperature gradient of flow
NTC too steep)
No demand to gas valve
Boiler goes to lock out
F.63
F.64
F.65
F.66
F.67
Electronic fault
F.33
F.37
F.41
F.42
F.43
F.60
F.61
F.62
41
42
No
Go to sheet B
No
Is the continuity
across fuse F1?
No
Yes
Replace electronic
board
No
Is there continuity
across fuse F3?
No
No
Yes
Yes
Is voltage between
16-26 VDC present across
terminals 8 and 9?
Yes
Yes
Note 1:
Replace switch
mechanism
No
Yes
No
Is there a display on
the LCD Panel?
Yes
Yes
Check transformer
Replace if
necessary
Go to sheet C
Sheet A
10 Fault finding
No
Yes
Check/replace fan
Check/replace pump
No
Yes
No
No
Yes
Replace fuse F1
Yes
Go to sheet A
Sheet B
Fault finding 10
43
44
Yes
Replace defective
timer
No
Go to sheet D
Does ignition
commence?
Yes
No
No
Yes
No
Sheet C
10 Fault finding
Yes
No
No
No
Yes
Check/replace fan
Yes
Yes
No
Yes
No
No
Yes
No
Yes
Go to sheet E
Sheet D
Fault finding 10
45
46
Yes
Yes
Yes
No
No
No
No
Reset boiler
Yes
No
Is burner indicator
illuminated
No
No
show S. 53?
Check flame
rectification lead and
electrode
Yes
Yes
Yes
No
Is burner indicator
illuminated?
Yes
No
Replace pump
Go to sheet F
Sheet E
10 Fault finding
Go to sheet G
No
Yes
Yes
No
No
Yes
No
No
Yes
Yes
Yes
No
No
Yes
Go to sheet G
Sheet F
Fault finding 10
47
48
No
No
Yes
Check/Clear impeller in
Aquasensor, replace if necessary
No
No
Yes
Yes
No
Yes
Yes
Go to sheet B/C/E or F
No
Sheet G
10 Fault finding
Diagrams 11
11 Diagrams
11.1 Functional Flow diagram: aquaPLUS VUI 362-7
CONTROL BOX
MAIN SWITCH
F2A
2
Central heating
demand indicator
Burner lock out
indicator
Ignition indicator
MAIN
TRANSFORMER
Hot water
demand indicator
Hot water
demand indicator
230V
20V
POWER SUPPLY
F1,25A
MAIN SWITCHBOARD
AIR
PRESSURE
SWITCH
gr
gr
plug in
connector
r
bl
b
gr
b
br
y/g
FAN
b
br
reset button
DHW
PUMP
PUMP
info button
DHW
Aqua
Sensor
DIVERTER
VALVE
y/g
p
p
bl
bl
bl
bl
NTC
TANK
TEMPERATURE
SENSOR
vi
r
br b
br
br
GAS
VALVE
t
y/g
FLAME
SENSOR
y/g
NTC RETURN
TEMPERATURE
SENSOR
br
or
blue
brown
yellow/green
red
pink
orange
transparent
black
grey
white
violet
br
NTC FLOW
TEMPERATURE
SENSOR
Legend
b
br
y/g
r
p
or
t
bl
gr
w
vi
IGNITION
ELECTRODES
NTC
DHW
TEMPERATURE
SENSOR
49
fan unit
22 10
X2
T 1,25
= F3
X1
L N
3 4 5
X3
X12
9
21
NTC DHW
T2
X14
X13 X601
U100
NTC
flow
coding resistor
NTC
earth
ionisation
electrode
lifting
magnet
Aqua
sensor
NTC DHW
NTC
tank
NTC
return
pump
22 10
air pressure
switch
7 8 9
flow
NTC
8
20
7
19
6
18
5
17
4
16
3
15
2
14
1
13
X2
X20
3
13
X4 (VUV) X7 accessories X8
4
14
5
15
gas valve
6
16
diverter valve
7
17
Aqua sensor
DHW pump
8
18
9
19
ignition electrodes
20
electrode
EV1
21
23 11
24 12
23 11
50
EV2
24 12
ionisation
X2
11 Diagrams
NTC tank
return
NTC
Description
Part No.
Burner
Key No.
031 532
Fig. 10.1
126 795
126 796
Ignition electrode
090 709
Fig. 10.2
Fan
190 215
Fig. 10.3
Gas valve
Fig. 10.5
Flow-NTC/Return-NTC
Storage tank-NTC
Warmstart-NTC
252 805
Fig. 10.6
065 087
Fig. 10.7
181 079
Fig. 10.8
130 821
Fig. 10.9
Main transformer
287 450
Fig. 10.10
Pump
160 928
Fig. 10.11
050 577
Fig. 10.12
Automatic bypass
150 246
Fig. 10.13
Diverter valve
252 457
Fig. 10.14
Pressure gauge
101 271
Fig. 10.15
Aqua sensor
194 819
Fig. 10.16
064 724
Fig. 10.17
190 732
Fig. 10.18
190 745
Fig. 10.19
DHW pump*
Fig. 10.20
181 081
Fig. 10.21
Fig. 10.22
* For these components, please observe the associated installation and removal instructions relating to spare parts.
51
Fig. 10.1
Fig. 10.2
Fig. 10.3
Fig. 10.5
Fig. 10.6
Fig. 10.7
Fig. 10.8
Fig. 10.9
Fig. 10.10
Fig. 10.11
Fig. 10.12
Fig. 10.13
52
Fig. 10.14
Fig. 10.15
Fig. 10.16
Fig. 10.17
Fig. 10.18
Fig. 10.19
Fig. 10.20
Fig. 10.21
Fig. 10.22
53
54
55