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Hi, Thanks for the response. I have done as you asked and powered down boiler and then tried the hot water. This did not make the whistling go away. I have taken a few pics and they are in my gallery under the title BIASI. Also as of yesterday I have also noticed that there is a clanging noise...

Pics of Boiler.

Hi anyone, I have a Biasi M96 condensing boiler which has recently started whistling really loudly whenever I turn on the hot water at the taps or the shower. I was wondering if anyone has come across this before or help pinpoint the reason for the whistling. The sound is not produced when the...