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riello rd 3 boiller?

last year i9 fitted our new riello boiler it has been working fine up untill now ,it has got this high pich buzzing and it hums while it is going .can anyone help me .
thanks martin
martin, December 2010
and what parts to get to fix the problem
thank martin

martin, December 2010
link Click here to see other fixes for Riello RD 3.