Seconds after each flush a loud humming noise comes from around the cistern area that can be heard around the flat. Holding the cistern when the noise is made, you can feel a strong vibration, so I'm sure the problem lies in there somewhere. The cistern is set behind a tiled wall, which may make it harder to fix.

It's become so loud that the neighbours can hear it! Any ideas what might be causing this? I have to put a stop to it soon!

Damian Davies, May 2007

We had the same problem. We looked at the pipes where the vibration was coming from, but no joy! Then after three weeks of being driven almost mad I took the top of the cistern off. I noticed that when a cold tape was turned on the vibration stopped. A neighbour told me about a valve that can be put on the cold feed supply to the cistern. The problem was all due to the pressure that was filling the toilet cistern. When the valve was fitted we could adjust the amount of pressure or flow speed in to the cistern. The problem stopped straight away.

Trevor, May 2011

We cured it! Same problem with our en-suite toilet,loud horn like noise when toilet is flushed.We turned off water,took out the ball & rod inside cistern,unscrewed the lid of the valve,took out the washer,looked into the tiny hole where water coming in,there was a bit of dirt inside,I think its limescale.We used a tiny screwdriver,poked into it a few times until we couldn't see the dirt anymore,slowly turned on the water to flushed away the now cloudy water inside it.Put back everything eg ball & rod. Flushed and no more noise. Relief!(sorry for the pun)

boji, November 2008

this is water hammer. you might be able to cure it temporarily
by reducing your water pressure by turning dow the stopcock to a lower flow

garry k, June 2007

diaphragm in float valve gone hard with time, fit new diaphragm or new float valve.

hi-spec plumbing, May 2007