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I thought originally the PCB could be at fault but the boiler does come on sometimes. Does that matter or can a faulty PCB still turn the boiler on? How would i know if the fan comes on ? The steam comes out the flue outside. I know that for sure.

Hey guys I have just purchased a house and when i turn the 24hours button on the timer for the CH the potterton boiler calls for heat (flashing amber) but doesn't respond (fire up) however, a few hours later if i try it then it does or may not. Also I set the timer (honeywell) for the boiler...

Hello Petchy. Did you ever solve this problem? I have just purchased a house and my potterton boiler calls for heat (flashing amber) but doesn't respond (fire up) however, a few hours later if i try it then it does. Also I set the timer (honeywell) for the boiler to come on but also flashes...