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Central heating engineer tested the same things again and drew a blank. He called in an electrician who diagnosed the fan as being at fault. He was correct, a new fan solved the problem. I don't know how I or the central heating engineer missed this - we both disconnected the fan...

Thanks for the suggestion. Using my limited knowledge I tried 1. with fan disconnected 2. with pump disconnected but still circuit breaker tripped, so have called for a professional. As a matter of interest I used a multimeter to measure ohms between each of the three terminals on the...

Dear all have a combi that trips the circuit breaker when the hot tap is turned on to demand hot water or when the central heating switches on. the boiler has a fan (always on) which speeds up, as it should, just before breaker trips. Also the pilot light igniter works as normal. The...