Cistern running push button loo

[silver50]

Am I right that with the later generation of cisterns (a 6/7 years old close coupled pan) with push buttons in centre of lid that if water is trickling into the pan it’s most likely the centre flush itself at fault rather than the fill valve.

This seems a common problem!

What’s the best plan of attack to fix it?

 

[johnny2007]

It depends.
If the inlet valve is leaking, the water will trickle in the pan via the top of the flush valve, the middle bit.
Instead if the flush valve is faulty, the water level inside the cistern will remain below the overflow and water will trickle from the bottom.
Lift the lid and have a look.

 

[silver50]

The lad is saying it’s running into the pan from the overflow.

Here’s a picture of it.

 

[Deleted member 292770]

fill valve

 

[foxhole]

Float arm looks to be jamming against side of cistern preventing the fill valve shutting off.

 

[opps]

My back to the wall WC (concealed) cistern recently had water running in the pan. Even after isolating the water supply, water still ran in to the pan. When I removed the vertical push button plate, I discovered that the manufacturer had supplied two spare washers. I removed the flush valve, fitted the two new washers and it has been fine.

Why not just isolate the water supply and see if you still have water running in to the pan?

 

[silver50]

Thanks folks.

Hope to get there tomorrow.

 

[Deleted member 292770]

looks like the float is catching on the top of the flush valve.

 

[silver50]

looks like the float is catching on the top of the flush valve.

As in maybe right there?

 

[Deleted member 292770]

As in maybe right there?

yep

 

[silver50]

To update and ask a question pls.

I got there today to check it out. The float wasn’t actually sticking but it was obvious the fill valve wasn’t closing off when holding its lever at what should be closed position.

I took the top of the fill valve apart. I manipulated and rinsed what seems to be a diaphragm/washer (pic) but it didn’t look like you could replace the diaphragm/washer because it seems sandwiched inside the white plastic fitting.

It’s now working again so I think the diaphragm/washer was stuck. But I’m thinking the same thing might happen again.

Would it be necessary to replace the fill valve or can this part (containing the diaphragm) be replaced or fixed in any way?