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© Baxi Heating UK Ltd 2011
18.0 Fault Finding
K
J
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Is there 230V at:
PCB - X3 connector terminals
5 & 6 central heating mode
Replace PCB
NO
Change pump supply cable
YES
Fan connections correct at fan.
PCB - X401 connector terminals 5,6,7 & 8
YES
Replace fan
Temperature sensors faulty.
Cold resistance approximately
10kΩ @ 25° C (CH sensor)
(resistance reduces with increase in temp.)
NO
Replace sensor
YES
If pump is running the heat exchanger could be
obstructed
Replace heat exchanger
1.
2.
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