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Well, sort of half told me. Thanks for the clue though.

Thanks, sorted now. It was a broken spring inside the domestic hot water microswitch, rigged a repair for now, and will try and replace it later.

Thanks that's a start, any clues as to which switch?

My "jaguar" combi boiler has recently developed a fault, when not drawing hot water it runs the central heating full on all the time, with no regard to the on/off setting of the control panel or the thermostat. The only way to shut it down is to turn off the mains power. I believed this to be...