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Came back after a night out to find the house very hot indeed. Had a play with the thermostat (set to 18degC) and it clicked at 27degC. So whatever the system's doing it isn't reacting to inputs from the thermostat. I've turned the radiator water temp down at the boiler, which means the...

Hi, Came back to a cold house (digs) last night and the radiators were lukewarm. It's an old house and loses heat like it's going out of fashion so needs warm radiators. The CH temp on the front of the boiler is set to 75C and the radiators are probably reaching about 40C. Cracked a couple...