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Not the first time someone has suggested that :shock:

Excellent, thanks

What Hugh Jaleak has said seems to make sense (although I am a complete DIY idiot so dont take my word for it). How much (rough guesstimate) would a plumber charge for fitting a single check valve? Is it a big job? May be worth getting that done if its not a big job just to try it

Theres no way of stopping it being "fooled" then?

Hi thanks for the reply, the noise does stop when the water supply is turned off. So even though the boiler is switched off, the hot water supply is still operational - I didn't know this. What you've said makes sense then, thanks for your help! Might get someone in to check all pipes are...

Any ideas anyone?

It seems to be worse late evening and early morning. I am in a terrace with a shared water mains but a friend doesnt seem to think that would make a difference

Yes, it doing it now and the central system was switched off at 9pm last night. I haven't used any hot/cold water since last night either

I have read lots of topics on here and have tried everything and nothing has worked. I have a Worcester 24i junior combi boiler that is creaking and making a thudding noise. Gas engineer serviced boiler and said it was fine. Plumber then fitted a water hammer arrestor which stopped banging pipes...