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Our Glow Worm Combi (6 months old) is banging a bit like yours - weve had the ignitor replaced for a 'new' type which made little difference and have been told that it may now be a sticking valve.

Like, I say, I could be wrong with the size! And in response to the previous question the flow rate is fine.

Cheers, The gas supply is fairly big - not sure of the diameter - but I think 32mm, and it does not travel far from the regulator. I will get it checked asap, thanks for your help.

Thanks, is it okay to keep it running for the time being?

I have a Glow Worm Flexicom 30CXi Combi Boiler, 6 months old. It used to be silent, but recently, when it ignites there is an incredible 'bang' which resounds through the unit and through the flue pipe to the outside. It is so loud it sounds somewhat like a car door being slammed shut. Is...