31
Code
Reason
10
no flame detected
14
check the wiring harness
15
false flame
20
high limit thermostat/burner
21
check the wiring harness
22
check the wiring harness
24
high limit flow temperature probe
26
high limit return temperature probe
28
flow/return
∆
T error
29
check the wiring harness
30
wrong parameter from the factory
33
fan error (low rpm)
34
fan error (start-up)
37
fan error (high rpm)
38
wrong parameter from the factory
40
low water pressure
42
pressure transducer fault
50-59
internal PCB failure
70
flow NTC error (2
nd
CH)
72
return NTC error (2
nd
CH)
74
flow temperature too high /flow sensor error (2
nd
CH)
79
flow/return
∆
T error (2
nd
CH)
80-83
internal fault
92
condensate level high
94
condensate sensor error
FAULT CODES 1x
Fault codes 1x appear when the burner has failed to ignite or the
flame supervisione system has failed to detect a flame.
●
Check incoming gas supply
●
Check spark electrode
●
Check polarity
●
Check integrity of flue system
●
Check gas valve
●
Check ignition control PCB
FAULT CODES 2x
●
Check wirings
FAULT CODES 3x
Fault codes 3x appear if the boiler or flue system has developed
a fault.
●
Check operation of fan
●
Check flue system
FAULT CODES 6x
Fault codes 6x appear if a problem exists with the secondary
(DHW) thermistor.
●
Check thermistor
●
Check wiring continuity
FAULT CODES 5x
Fault codes 5x appear if a problem with the main board exists.
●
Check parameters
●
Check gas valve
●
Check PCB
FAULT CODE 7x
Fault codes 7x appear if a problem exists with the flow temperature
(2
nd
CH)
.
●
Check thermistor
●
Check wiring continuity
FAULT CODE 8x
PCB fault
FAULT CODE 9x
Fault codes 9x appear if the condense trap/pipe has become
blocked.
●
Ensure the condense trap is clear
●
Ensure the condense pipe is clear
NOTE
Restore the electrical supply to the boiler and turn
the selector switch to the on position. The boiler
should now function as described in section 7.2.
Should the boiler fail to respond, the internal fuses
and connectors should be checked to ensure in-
tegrity and continuity. If the boiler still fails to
respond, refer to the detailed faultfinding flowcharts
overleaf.
7.10
TEMPORARY FAULT CODES
The built-in fault diagnostic system automatically
displays a unique faul code that can be used to
determine why the boiler has temporarily locked
out. When the boiler displays a temporary fault
code, the appropriate code is shown flashing on
the display, accompanied by the symbol
.
7.11
FINAL FAULT CODES
When the boiler displays a final fault code, the
appropriate code is shown flashing on the display,
accompanied by the symbol
(RESET).
7.11.1 CODE ERROR +
(RESET) ONLY
To reset the boiler, push button. If the boiler
starts without any problems, the lock-out is prob-
ably due to an accidental situation.
7.11.2 CODE ERROR +
(RESET) +
Refer to the following section and the detailed fault
finding flowcharts overleaf.
Code
R
eason
11
false flame
12
restart ignition
13
check the wiring harness
23
check the wiring harness
25
high limit flow temperature probe
27
high limit return temperature probe
31
internal fault
35
fan error
36
internal fault
41
low water pressure
60
DHW NTC error
71
flow NTC error ( 2
nd
CH)
77
over heat underfloor thermostat (2
nd
CH)
78
flow/return
∆
T error (2
nd
CH)
93
condensate level high
95
condensate sensor error
FAULT CODES 4x
Fault codes 4x appear if the pressure in the boiler is low.
●
Check water pressure
●
Check water pressure sensor
