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I have searched the forum for information but do not find anything helpful. I have a 10 year old Barcelona system boiler installed on a system with underfloor heating, radiators and DHW cylinder. There is no heat store, there is a primary circuit from which fluid is drawn for radiators UFH...

Baxi Barcelona system boiler, 5 years old. Problem: it produces a loud whistle (even howl) during parts of the firing, usually as it is modulating down. Lasts for maybe 5-10 seconds as the fan slows. I have recently replaced the combustion box door seal and tightened the screws securing...