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How can I stop my Greenstar CDi combi making loud vibrating sounds?

I turned up my central heating at the boiler, and now the boiler is making an awful vibrating sound all the time. It's a Worcester Bosch Greenstar CDi and was only fitted a year ago.
Lricardo, December 2010
Call out Worcester, the boiler has a two year guarantee

Carefree, December 2010
link Click here to see other fixes for Worcester Greenstar.