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why does my boiler make a screeching sound?

my main combi 24 he boiler makes a screeeching sound when the heating comes on why?
kev, January 2009
the most likly reason is the system was not flushed out corectly when installed which has caused a blockage, but it could also be the pump is running too slow

www.gascentalheatinguk.info, January 2009
Sounds like it could be the pump. Is Main the make or the model of the boiler?

toots, January 2009
link Click here to see other fixes for Ideal 24 HE.