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baxi bermuda back boiler keeps going off after about 20 seconds, keeps knocking pilot off too. flares up when lit, stays lit for about 20 secs then goes out, any clues, cheers, ps had it serviced last week and stayed on for 1 day then back to normal

hi, new poster so please be gentle. boiler is 24s biasi combi boiler, just over a year old, just recently when heating comes on have started to hear a continuous "whistling or squealing" noise coming from boiler. it doesnt happen when runnig hot water. any advice anybody could give, many thanks...