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Hi, I have a Sime Halstead Trio Combi. There is an intermittent fault causing the burner to keep firing on the central heating, which makes everywhere too hot. There is no room thermostat, just the temp control knob on the front of the boiler panel. Any advice as to curing this would be...

I have a Sime Halstead Trio combi boiler. There is no room thermostat, just the control's on the front panel. There is an intermittent fault causing the heating to stay on, getting the rads too hot. Not the timer, I mean the thermostat doesn't appear to be working correctly. Before I dive in...