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what could be wrong with my Baxi boiler?

Over the last couple of days my boiler has become very noisey
when it is heating the water and central heating.It sounds like rushing water mixed with a slight grinding noise.
john nash, February 2007
either header tank run dry if it is a conventional system. if its a combi the wataer pressure

young man, February 2007
its could be your fan on its last legs or your pump

hi-spec plumbing, February 2007
link Click here to see other fixes for Baxi.