How to adjust toilet fill level

[Heather7000]

Hi,

Could somebody help me with some advice please?
My toilet is leaking. It is filling above the overflow pipe and is constantly running water into the bowl.

When the cistern fills, the float goes as high as it will go but the water continues filling and goes down the overflow pipe.

I have a bottom entry fill valve (photo attached). I have removed the small clip on the vertical pipe going up to the float. From reading the forums I believe I need to rotate the unit 90 degrees in order to adjust it up and down. However, it won't quite go 90 degrees as it hits the edge of the cistern. I can't remove the whole unit as the toilet is sealed and I can't access underneath the cistern.

Am I correct in what I am trying to do, or is there another way to lower the fill level?

Thanks
Heather

 

[moonlight]

Increasing the height of the valve wont help, you need a new diaphragm in the valve.

 

[centralheatking]

If its a twist and release unit just go get another one. Setting the water level will not solve your problem. However after you have turned the supply off to the cistern then after you have lifted off the siphon have a look it might be affected by crud or a bit of debris from the water supply, give it a wipe
replace and see if that solves it ..if not go get a replacement . centralheatking

 

[Heather7000]

Hi, thanks both for your replies! I did finally manage to adjust the height and you're right, it's made no difference.

I didn't know you could get twist and release units, I thought I would have to remove the whole cistern to get it out. I'll try and find out.

Thanks
Heather

 

[steadyon]

You have two choices:
1. Take the diaphragm washer out of the existing inlet / fill valve. Never worked on one, but from looking at it I suspect you push together the two grey plastic "ears" just below "WDI" in your picture, and the grey piece will pop out to reveal the diaphragm. Then clean, and replace if necessary.
2. Replace the entire inlet valve. Doesn't look as if you have much space in the cistern for a Flowmaster (my preference), so you might look at a Skylo Viva or a Torbeck. The WDI is a Chinese make and not widely available, though presumably cheap.
3. You need to isolate the water supply to the cistern before either 1. or 2. With luck you will have an isolation valve in the pipe leading the water into the cistern. If not you'll have to find another way of isolating.

 

[Chuck]

Looks very similar to this:

BSP Adjustable Toilet Filling Valve 1/2" Bottom Feed - B3300-Y

BSP Adjustable Toilet Filling Valve 1/2" Bottom Feed - B3300-Y Bottom Cistern Fiiting Water delay inlet function adjustable between

www.bathroomspareparts.co.uk

I'd replace with a Flowmaster Pro myself.

 

[Heather7000]

Thanks, I'll try to remove the top tonight when I get home. If I do need to replace the whole thing do I need to take the cistern off completely to access the underneath? The base of the toilet is sealed, a bit like this one:

​

There are screws inside the bottom of the cistern, do I just need to unscrew these to take it off?

 

[centralheatking]

Thanks, I'll try to remove the top tonight when I get home. If I do need to replace the whole thing do I need to take the cistern off completely to access the underneath? The base of the toilet is sealed, a bit like this one:


There are screws inside the bottom of the cistern, do I just need to unscrew these to take it off?

Turn water off, then explore

 

[steadyon]

That is what is known as a "back to the wall" toilet. Unless there is a very obvious isolation valve nearby, you will have to turn the cold water off somewhere else (main stopcock, water meter). Whatever method you use, flush the toilet after shutting off the water, and make sure the cistern doesn't fill up again.
The two screw heads you can see inside the cistern are to hold the cistern to the bowl. Do NOT undo them.

 

[Heather7000]

Thanks for your advice, I would have unscrewed them , There is an isolation valve on the outside which I have turned off. How do I take the fill valve out if I can't get underneath the cistern to unscrew it? I assume it's screwed on from underneath like this?

 

[steadyon]

1. Yes, it will be fixed as the one you show.
2. To get it out requires access to the underside of the back of the bowl. To do this requires the WC to be removed. I'd suggest this is a job only for the most experienced DIYer.
3. Another triumph of form over function.

 

[Heather7000]

Ok, looks like I may have to pay a plumber to do it for me.

Thanks everyone for your help and patience!

Heather

 

[centralheatking]

Ok, looks like I may have to pay a plumber to do it for me.

Thanks everyone for your help and patience!

Heather

Unfortuately this is the reality of designer bathroom fittings, however it is obvious you have above average practical abilities so I suggest you be there to see and learn what happens and make sure a twist and release siphon is fitted. centralheatking