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I am surprised that you consider that suggesting probable causes from symptoms is irrelevant. From my own experience of fault finding, albeit in a different field, it is quite normal to identify the likely causes of the fault from the reported symptoms, which are then eliminated in turn until...

Sorry, but I asked if the pcb or sensor were likely suspects, I didn't say they were the cause. As a retired electronics engineer, I naturally look at areas that I have experience of. Asking family and friends would be the natural course of action, but having just moved here from the north east...

That's exactly what we thought, he was only interested in selling a new boiler. Needless to say we are wary of getting another "heating engineer" out to tell us to replace the boiler. I gather from what you said, that engineers actually capable of diagnosing boiler faults are few and far...

After a few minutes running hot water, the left hand operation light flashes quickly, the water goes cold and switching the boiler off and back on again gives an ignition fault indication with the two outer lights flashing and the centre light on. Further attempts at switching on and off have...