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Hi Agile, the problem seems to occur regardless of how high the boiler heating control is set. In fact I have tried it on all of the settings.

I am living in a rented house with a Worcester 24i boiler fitted. There is a thermostat downstairs and one on the boiler itself. It seems that no matter what we have the thermostats set to, the central heating comes on red hot before going off after a short while. This happens regardless...