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Realised I never added the vid link....

Hi! Still not found the answer! It hasn't got any worse....but still does it every few days. I'd love to know the answer if you find out!!!

Thanks gordongas and mcmoby69. I will get someone out. (y) Matt

Hi gordongas. Thanks for the reply. Would this cause the while boiler to vibrate violently? Thanks.

Possibly they didn't know the answer? Just a thought! However, on a serious note, I forgot the pleases and thank you's and I'm sorry!

Hi all. I have a potterton promax sl boiler, which intermittently makes a really loud vibration/noise that seems to be a problem to diagnose as i cant always reproduce the noise. It won't happen from a cold start on the boiler....only after it's been running for an hour or so....and can go a...