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Probably a fault on the thermostat. Your thermostat is telling your boiler to keep the heating on despite the temperature being too high.

Thanks for the swift replies guys, you have all been extremely helpful. Woke up this morning to a cold house again and 1 minute of running the hot water tap brings the heating back on. From the little I know, it does sound like a sticky diverter. When I turn the hot water on and then off again...

Hi guys, I have a Potterton Performa 28i combi boiler which has started playing recently. Hot water works absolutely fine and when the heating does come on it ok. I have it on timer but recently the heating has only come on intermittently. Whne on, its fine for a while but stops when the...