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Phantom water noise in pipes

Posted: Tue Sep 16, 2008 6:22 pm
by Scissorman
We have an en suite shower and wc situated on the 1st floor of our home. The basin is situated about 3 feet from the toilet. The toilet gubbins is a fluidmaster 400a.

A few weeks ago it started to suddenly refill briefly at all times of the day and night when no one was using it. This would happen up to half a dozen times a night.

I checked the cistern and replaced a couple of worn O rings on the valve body and it was then fine for a day or two.

Then we started getting the noise of rushing water, similar to when you turn on a tap, from the pipework between the toilet and the hand basin. It's weird in that it lasts exactly 9 seconds and only seems to really start during the evening and night.

It's driving us mad - any pointers or suggestions would be gratefully used.