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I changed the pump today thinking that the continuous droning noise was the pump. It has made a difference but not solved the problem entirely. Before the pump change noise wasevident with the water on and the rads. After the pump change water only is quiet, but the heating on and...

Hi I have a Myson Compact CP63 central heating pump which makes a continuous humming sound when the system is on. This has been happening for the last three months and is getting the better of me. Is it a fairly simple job just to buy a replacement and re fit? Any help would be...