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Fig.71
Solutions sections A to E
A
Is there 230V at:
1.
Main terminals L and N
2.
Main terminal fuse
3.
PCB - X10 connector
Main terminals L and N
B
Switch to DHW mode maximum flow and press reset.
During next 3 minutes check:-
230V at PCB - X13 connector
(between blue & brown - see Wiring
Diagram)
C
Fan connections correct at fan &
PCB X11 and X23 connectors -
see Wiring Diagram
230V at PCB - X11 connector
(between blue & brown - see Wiring
Diagram)
D
Temperature sensor faulty.
Check correct location and wiring.
Cold resistance approximately
10kΩ @ 25° C (DHW and CH sensors)
(resistance reduces with increase in
temp.)
E
Gas at burner
NO
NO
NO
YES
NO
Replace PCB
NO
YES
YES
NO
Replace PCB
YES
NO
NO
Ensure gas is on and purged
Check wiring and PCB - X36 connector
see Wiring Diagram
NO
Replace PCB
10.2.3
Fault finding solutions sections A to E
Check electrical supply
Replace fuse
Check wiring
230V between PCB - X13
connector (blue) and PCB - X11
connector (black) - see Wiring
Diagram
NO
Replace PCB
Make connections
YES
Fan jammed or
Replace fan or wire
faulty wiring
Replace sensor
YES
Replace gas valve
Connection
OK at X41
NO
Display
Display or
illuminated
Main PCB fault
YES
YES
230V at pump
Replace pump
NO
Check wiring
10 Troubleshooting
PN-0000317
67
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