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It turned out that the motorised valve had partially failed. Although it was still turning, the lever was not making contact with the microswitch and therefore not starting the boiler. It failed completely on 24th December. Followed by the other one on 27th.

Hi, Our house has two central heating zones: the living room which has a programmable thermostat, and the rest of the house that has a simple dial in the hall. We have the heating on continuous and use the thermostats to turn it on and off. I have notice that after turning up the dial in the...