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Does anyone know the answer to my problem? Being an ex electrician I can deduct that the selector switch allows an EMF to flow thus creating a circuit, this to convert electrical energy int a mechanical force via (one assumes) a solenoid combined with a fluid valve. This valve (or valves)...

That was interesting!! No !all the controls are contained within the combi. Only a remote room stat controls the central heating which of course I can overide at the boiler

At the end of September I noticed that my central heating came on with only "domestic hot water" selected. It seemed to correct itself but has now reverted to the fault. EG. With only domestic hot water selected the central heating rads heat up and the domestic "hot" water is cold. I have a...