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Pipes making banging noise when flushing toilet
Jhalak Rai 10/11/2026 - 8.07 AM
Pipes make very loud bangs when i flush the downstairs toilet. Most of the time, it is just one bang but occasionally, bangs go on for almost 30 seconds or so. To be precise, I think bangs happen when the cistern is filled or when it starts to get filled, very hard to tell but it's one of those!
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3 Answers
Vialtus Construction Ltd
No reviews yet
Its likely to be water hammer, caused by a faulty cistern valve. The first thing to do would be to turn the water supply off to the cistern by shutting off the isolation valve. If the banging stops then you know for certain its the toilet. In which case it you would need to replace the cistern fill valve.
Answered10 November 2026
2
Anderson plumbing
No reviews yet
Potential water hammer. Pipe not clipped properly.
Answered10 November 2026
1
Master plumbing & heating 4u ltd
Rating: 5 out of 5
Need to replace toilet inlet pump
Answered10 November 2026
1