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how can i fix my worcester junior 28?

boiler makes kettling noise when heating is warming up theres no air in system ive bled it and a new pump has been fitted and pressure is fine but when noise starts pressure dial twitches
dale needham, May 2008
could be restricted flow through main heat exchanger hence the distress noises you're experiencing

iain, May 2008
link Click here to see other fixes for Worcester.