noisy toilet cistern refill

searchlight123

hi
in our downstairs loo quite often after flushing (push button / dual flush) a couple of minutes later as the cistern is refilling (direct from mains i believe), the pipes make a very loud vibrating noise that reverberates around the house. this noise only stops when we re-flush the loo. sometimes this needs doing once and sometimes 2 or three times. not very economical for our water bill, and annoying if we are upstairs in bed when this happens!!
any ideas on how we can cure this irritating problem.
many thanks.

Myser

Sounds like it could be the diaphragm washer.

Can you post a picture of the inside of the cistern?

Also have a read of this thread:

https://forums.moneysavingexpert.com/discussion/3687437

davep

Hi,

We had a very similar problem a couple of months ago. When we flushed and the cistern was refilling the pipes would hammer, in our case it was down to the rubber diaphraghm which fits into the float arm valve mechanism. The rubber had perished causing it to split slightly. If you isolate the water and remove the diaphraghm and black residue comes off it on your fingers this is a sign its perished. Your options are to replace the whole float and valve mechanism (around £5 from DIY stores) or buy replacement diaphraghms (around £2 for a pair so you have a spare) I think they are all standard fitment but would take the old perished one with you to the DIY store just in case. We got ours from Wickes BTW.

Hope this helps.

Myser

I think they are all standard fitment

They aren't all a standard fitment. Probably best to take the old one with you to your local Toolstation or Screwfix.

shelly

Myser wrote: »

They aren't all a standard fitment. Probably best to take the old one with you to your local Toolstation or Screwfix.

as was advised by davep

Myser

Originally Posted by Myser
They aren't all a standard fitment. Probably best to take the old one with you to your local Toolstation or Screwfix.

shelly wrote: »

as was advised by davep

Yes except, if the OP assumes they are all a standard fitment, they may have to make a second trip. Wickes doesn't have as large a range as Toolstation or Screwfix.

googler

Turn down the water flow to the cistern? If properly fitted, there should be an isolation valve close to the cistern. Turn that down to vary the flow rate and see if that cures it.

Myser

Turn down the water flow to the cistern?

That may temporarily cure the problem but, it's probably best to replace the washer for the sake of a few pounds.