On 13/02/2015 20:26, charles wrote:
I was getting localised boiling (kettling) in my GlowWorm boiler when the
pump turned off. I've added ScrewFix Boiler Noise Reducer and that problem
seems to have gone. I now get an alarming clanking instead which I'm sure
wasn't there before.

Any ideas as to what is causing it and how to stop it?



Air lock? Try turning the pump to full speed for a few minutes.

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