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Well it's definitely not whistling "We wish you a Merry Christmas" :lol: Thanks for the tips but am completely ignorant as to what X200 is or where I can get it! Could you expand on this please?! Many thanks and Merry Christmas

Hi, in the last 2 weeks our boiler has started making a whistling noise (not kettling/banging) all the time it is firing. The radiators are still getting hot and we are still getting hot water okay but does anyone have any idea what might be causing this noise? We think the boiler is...