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whistling boiler?

i have an ariston euro combi boiler that keeps whistling quite loud every so often what could be the cause?
T Weston, November 2008
It could be something called kettling which is caused when the boiler has a build up of deposits in it-more common in hard water areas. It could be something else like a pump making the noise. Get a plumber to have a listen.

daz71, November 2008
link Click here to see other fixes for Ariston.