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Got a combi boiler controlled by a Drayton room stat, the one you manually turn the dial round to 30 and the boiler comes on and then turn it round to 10 for it to go off, recently when I turn it round to 10 it goes off but then comes on a minute later and heats the radiators up until they are too hot to touch, only way to stop it is by isolating the boiler at the FCU, any ideas what could be causing this?