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thanks, could this be to do with water scale? I live in west London with hard water, but the boiler runs striaght of the mains. Also, once of twice recently, the central heating has come on automatically, and only turning on the hot water for a few seconds can turn it off again. Was this...

Potterton Puma 80 boiler has stopped working. Mains light and low pressure system lights are on, fan is working, but no HW or CH. I checked the CH pressure gauge; it showed 1 bar. I turned on the filling loop and filled up until at 2bar. I've turned everything back on and there is still no HW...