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My radiators keep coming on even though the thermostat is turned off and the boiler is turned to the summer setting of hot water only. It seems to happen more when the hot water is turned on, then they get very hot very quick. The boiler is a combi valiant.

I am changing Honeywell T6360b for HOneywell DT200. I currently have 4 wires: white one - which wasn't being used at all yellow & green one - earth I think blue one brown one The DT200 seems to use only 2 terminals A and B as the C one is covered with a plastic tab. I'm not sure...