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Your right I did miss the cable to the thermostat, but I managed to figure it all out, it turns off when I twist the thermostat off and comes on when I turn clockwise. Also the programmer if I turn it to on, turns the heating on if the thermostat is high enough.

Thank you CountryFan it did work, I always forget the Combi is mains, first time having a combi to be honest, I will probably upgrade to a hive system soon as we are renovating our new home at the moment. Thanks again, very much appreciated

Okay so I have been decorating inside my boiler cupboard, I thought I would be clever and replace the cable to the programmer for a cable with a black and grey rather than live and neutral colours everywhere. And to put all the wiring in trunking to tidy it all up. And now clever me decided to...