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Screeching on my combi boiler ?

Just recently my Vokera combi boiler has started to make a really loud screeching sound when the heating or hot water comes on. The boiler still fires up and creates hot water but the noise is like a dodgy fan belt on a car. Please help.
Louise Richardson, November 2008
i would say faulty fan or pump

gasman, November 2008
link Click here to see other fixes for Vokera.