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I've had a quick look at everything else, and all appears to being working ok. I think it is the PCB as every time I drop this down the boiler runs fine, but as soon as I closed it the problems start again. Then again, I suppose by having the PCB hanging down is also allowing air movement...

Baxi combi boiler model 80eco, intermittent fault on the PCB. Boiler sometimes fails to fire up when hot water tap opened or when heating set on timer. After checking the PCB I found that if I unscrew the cover and leave the PCB hanging down on it's hinges it works fine, but as soon as it is...