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Yes Gas is ok. By switchmaster are you referring to the Boiler or the 3 way valve? Are you saying that there could be a short in the boiler ?

My Gas CH and HW heating has packed up and I cant get it going The boiler is a RD1 system (I think is Brit Gas supplied) The boiler front panel has an eyeglass on the front with a variable 1-6 front panel control . There is also a reset switch. When the thermostat control panel is commanded...