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Hi Newgas, thanks for your reply. My noise problem only happens when hot water AND central heating are demanded at the same time. If the heating isn't on, hot water is delivered without any noise at all. Does that rule out the heat exchanger? Thanks again, Mike.

I hope so. Thanks for your reply, Tony. I can't imagine that I've stumped everyone with this issue... ideas, anybody? Thanks, Mike.

Hi all, I have a squealing boiler issue that seems different to the norm, well I can't find any similar posts regarding this! When CH is on and hot water is demanded, by opening a tap (any HW tap), there is a loud squeal or whistle given off by the boiler. The squealing used to stop after...