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The bolier is fitted within the house so it is not in cold conditions. It says in the instructions that the boiler has a 'Pump Overrun' facility which will turn the pump on for a few minutes every day. I guess that it is this function which is turning it on - but it doesn't turn off.

I have a potterton Suprima 50 which is 5 years old. In the night, when the boiler should be standing still, suddenly the pump starts. The boiler is not fired up, just the pump running I have tried reset, no good, can't sleep. At present, the heating is off and the hot water is on timed. When...