I have a funny noise i thought it was a helicopter when i first heard it coming from my Valiant boiler which is about a year old but it only happens between 8-30 and 9-30 pm strange the rest of the time there is'nt a sound can anyone shed any light on it
Could be the transformer is buzzing. This can be due too increased voltage like it going up to or past 250v. Something’s as industry shut down the grid is under less demand and there is a voltage rise before the systems fixes it. Just a guess tho as I know biasi have had this problem
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