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Hi all, Gas/air mix was checked and fine. New heat exchanger fitted by GW and, so far, so good. Thanks for the help and advice David

Thanks for the responses. Engineer and installer due on Thursday and I will give an update after that.

Hi guys, New to the forum but looks like lots of good advice on here! I had a Glowworm 18hxi installed three weeks ago. After 8 days the boiler started making a high pitched noise but only as it warms up. What happens is that the temperature builds up to about 50 degreees C and then...