Toilet cisterns overfillling

Joined
8 Jul 2009
Messages
50
Reaction score
1
Location
Essex
Country
United Kingdom
Our 2 upstairs toilets have recently started to overfill meaning that the toilet constantly flushes. One of the toilets is worse than the other in this respect.

I have looked in the cistern and it looks as if the valve is a Torbeck type but probably not an actual Torbeck valve. All I can see on the valve are the words "Quiet ballvalve".

Firstly is it worth trying to replace the diaphragm by undoing the retaining nut with a 'proper' Torbeck item? Should I be replacing the float too?

Or should I simply replace the whole unit with a Fluidmaster Fill Valve as is what we have in our downstairs WC and which gives us no issues? If this is the best course of action, is this easy to fit by a DIYer?

Thanks.
 
Sponsored Links
First check when you lift the float up, that the inlet valve close and water stops.
Then check that float is set in the correct position to close the inlet valve, rather than dumping water out of the overflow. I would be surprised if this is a diaphragm problem.
Very likely to be float setting or faulty inlet valve.
 
IME this type of valve is prone to clogging with grit, rust or limescale fragments in the water.

Turn off the supply, take it off, dismantle, wash it out in a large glass mug or dish so you can see what comes out, reassemble with care (look out for a metal needle).

If there was dirt, turn the water back on to flush out the supply pipe before you refit the valve.

It often happens after work on the plumbing or watermain has disturbed sediment.
 
Thanks for your replies.

Oddly when I raise the float by hand to the horizontal position (i.e. the approximate fill level of the cistern) the water doesn't stop.

Something else that seems to be connected is that this happens more when the water pressure to the may be lower because of the central heating pump being on, other taps on, etc. Does this mean anything?
 
Sponsored Links
Oddly when I raise the float by hand to the horizontal position (i.e. the approximate fill level of the cistern) the water doesn't stop.

Clean out the grit.
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links
Back
Top