the problem started with the boiler not firing when hot turned on also sometimes for both heating and hot water the light flashes on panel saying fan or flue fault on boiler will not fire up at all now can you help
a) does the pump run?
b) does the fan run?
c) does the boiler spark trying to light?
assuming the fan runs and the boiler doesnt spark, the problem lies with the aps (which would lead to flue/fan faults) or possibly the fan it's self is not comming up to speed
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