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Thanks for your help, looks like it was the micro switch.

The radiators are definitely heating up. When we turn hot water on this triggers the green 'flame' light as expected. Problem is sometimes when we turn the hot water off the flame light stays on (and you can hear the boiler working) and heats the radiators up until they are red hot, after a...

Thanks for the quick reply. I believe the entire valve was replaced.

We have a Potterton Combi 80 boiler. Problem: Running hot water leads to radiators heating up, despite the central heating being turned off (but this doesn't happen every time the hot water is run). After a while of heating up the boiler locks out. About 9 months ago we replaced the...