Boiler/CH Problem diagnosis?

Joined
8 Oct 2011
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Location
Hampshire
Country
United Kingdom
I've got a Britony Combi SE boiler that has a problem.
Hot water is fine, works perfectly.
Pressure is in the middle of the gauge (2bar+).

When central heating is demanded the boiler does nothing, no error shown on the display and is completely silent.

I have a service manual for it and have done a little reading, what should happen is two solenoid valves should open to allow gas to the burner. I don't think this is happening, but the valves are also used by the hot water side so are presumably not defective.

Has anyone got any suggestions on how I can determine where the fault lies ? At the moment I'm thinking it is possibly the PCB ? on the basis if that never initiates the sequence to start the boiler it wont go.

Edit: Although I had checked it out I've got doubts over the room thermostat working properly. I've just reset it (its a programmable one) and added new batteries and it appears to be behaving..
 

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