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Thanks for the advice, I've just had a bit of a breakthrough. I was looking inside the cistern and coincidentally the noise happened. What I saw was the level of the water go up in the cistern then the clunk of the valve! Your advice seems to be right and I can now get it changed. Many thanks is!

OK but would there not be evidence of the existing water in the cistern going somewhere?

Recently moved into a small semi which had had a new boiler fitted in June 2014. At random times, sometimes every 20 minutes then nothing for hours and including during the night, the sound of water coming in and then the clunk when the valve closed is horrendous, so loud it over-rides the...

Thanks. I'm nervous about turning off the supply in case it wrecks the boiler. Only the cistern is attached, there is no overflow evident so can't imagine why it would need to fill regularly. I know it is something to do with the mains in as everything is on the same wall, I don't think it's my...

Any ideas gratefully received PSE. I have recently moved into a small semi which had a new combi. boiler fitted in June 2014 so is less than 7 months old. In the last few weeks, at random times, including during the night and waking me up (and the neighbours), what I can only assume is the water...