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Intermittent loud noises from 37cdi boiler?

worcester 37cdi boiler has suddenly taken to making loud intermittent growling noises when either heating or hot water taps are used. indicator panel nomber drops and is replaced by a flashing -II- sign

Any ideas
BJW, September 2012
check water pressure as system maybe low on water pressure

kash, September 2012
link Click here to see other fixes for Worcester 37cdi.