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Tony Thanks for the advice but I can still not determine if it’s the fan,(new fan £136 +vat) the noise seems to come from the top half of the burner hood and transferred to the fan and surrounding area. I am wondering now if it’s the main heat exchanger above the burners

Hi I have an Alpha 280 boiler about 5 years old it makes a high pitch whine intermittently, If I turn the boiler off it sounds like a dry bearing that’s tight at first I thought it was the motor so fitted a new one its still there after the change have ran the fan by its self and that seems...