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How to fix Worcester Heatslave 15/19 combi boiler?

My Worcester Heatslave combi-boiler has suddenly started making a nasty screeching noise and I have had to switch it off. What could be the problem?
Kevin, July 2009
could be the pump

Ian, July 2009
Oil fired boiler? Probably the coupling between motor and fan if the noise is there before the thing ignites.

John, July 2009
link Click here to see other fixes for Worcester.