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Thanks for replying. The red pilot light on the thermostat comes on when I turn the dial clockwise but the boiler does not come on. The programmer installed is a Horstmann CentaurPlus C27. Since I noticed the issue I have set the timings on the programmer so that the CH is 'on' for most...

I had a new boiler, programmer, cylinder and thermostat installed last March. When it got colder this winter I noticed that at times the heating was not coming on, despite the programmer being on and the temperature being way below the thermostat setting. I looked at the instructions for...