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grating soung on potterton profile 40e balanced flue gas boiler?

my potterton profile 40e fanned balanced flue gas boiler has been making a grating sound for several months now, all working fine but louder with heating on, any ideas please ?
brian, January 2011
fan sticking. try greasing fan. if it doesnt 100% cure it replaceit. but expect it to be around 100 pound

S.PRIESTLEY gas fitter in barnsley, January 2011
Only moving part in the boiler is the fan

Carefree, January 2011
link Click here to see other fixes for Potterton.