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Just the actuator was replaced. Spindle on the valve moved freely when I checked it and I can hear it opening when I turn the heating on. It just seems weird only one zone of the house keeps heating and it is completely ignoring the thermostat so even if its set to 10 degrees the radiators are...

I just removed the clock face and it shut down the boiler down. Surely it has to be an electrical fault if the clock is set to off and the heating is still running? Does anyone know if a valve left open by the actuator can cause the heating to continue to run even if the clock switches to off?

Thanks for the replies - when the clock is disconnected the boiler shuts down.

Hi, I have had a plumber and a spark out to look at this and they are both scratching their heads and blaming the other - so any suggestios will be gratefully received! I have an oil fired central heating system with two zones. The first zone CH, when turned on at the Horstmann Channel Plus...