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Thanks for your help!!! A FRIEND TOLD ME IT COULD BE TRAPPED AIRR IN THE SYSTEM-COULD THAT BE IT OR IS IT MORE LIKELY TO BE YOUR FAN SUGGESTION? WHAT DO YOU THINK? THANKS, BEN

I have a Chaffloeaux de Maury combi boiler, and after running a hot tap for more than a few seconds, when you turn the tap off it makes the a bloody racket- sounds like a whirring motor slowing down very loud- any suggestions? Thanks.