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Thanks for the help, I failed to mention that the boiler is 2 years old but the system is about 20 years old. It was not power flushed when the new boiler was fitted, the thermostaic valves were fitted to the radiators, at the same time as the new boiler. regards feeble

Hello Folks, Can anybody advise me, on how to cure a micro bore central heating system that has a loud whine. It appears to be coming from the pipe work and is always there when the boiler is running. Although the boiler itself is quite whiney. I have a 2 year old Baxi 105e Combi boiler and...