Slow filling toilet

davecon70

davecon70

Joined
26 Mar 2020
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Morning all

Appreciate there are a few posts on this but recently I’ve noticed that the cistern is taking ages to fill up. The supply is fully open so it must be the flush valve.

When it fills up it’s more like a fine spray than a steady flow of water. It does stop filling though.

Any advice on how to open up the valve and check for debris? It looks as if its clipped on both sides as opposed to screwed in. I can’t seem to get under or around the clip to pop them out, unless I remove the whole valve?

If it’s too tricky then I suspect a replacement valve would be the best solution, assuming I can find the part. Hopefully it’s a generic part and can find on Amazon or plumbers merchant.

Any advice would be most appreciated!
 

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New rubber seal.
You can sometimes clean them but often they need replacing for a long term fix.
 
I just swap out with a fluidmaster with brass thread.
I can't be messaging with sourcing rubbers as it's difficult to identify and find instructions for these inlets sometimes.

You can try and take apart but film yourself doing it.

​

 
It might have an inline filter but probably better to replace it. Brass shank is a must
 
I had a fiddle as all of a sudden the water kept running. Shut the water off, turned the plastic white anticlockwise and opened up the water supply. Filled much faster and touch wood not overfilling.

Going to get a replacement part just in case.
 
Wayners said:
I just swap out with a fluidmaster with brass thread.
I can't be messaging with sourcing rubbers as it's difficult to identify and find instructions for these inlets sometimes.

You can try and take apart but film yourself doing it.

​

Click to expand...
I didn't have much luck with fluidmaster.
I had to replace 2 in 3 years.
So last time I went for the cheaper Toolstation Viva fill valve.
So far so good and after a year it still fills very quickly.
I'm not in a hard water area.
 
Siamp filling valve washer required, doddle to fit, isolate water, undo the plastic nut, replace washer and refit ensuring the plastic arm lugs are in position, reinstate water supply
 
Stuckinarut said:
Siamp filling valve washer required, doddle to fit, isolate water, undo the plastic nut, replace washer and refit ensuring the plastic arm lugs are in position, reinstate water supply
Click to expand...
Got the valve this morning in and replaced it. Saw the old one was shredded and popped the new one in.

Now the cistern keeps filling beyond the float even though the float moves up when the water reaches it. Can’t figure out why it’s not shutting off?
 
davecon70 said:
Got the valve this morning in and replaced it. Saw the old one was shredded and popped the new one in.

Now the cistern keeps filling beyond the float even though the float moves up when the water reaches it. Can’t figure out why it’s not shutting off?
Click to expand...
This is exactly what happened to me a couple of times I tried to fix fill valves.
For the sake of £10 and 10 minutes work, changing the whole valve is the way to go if you want to avoid a lot of swearing.
 
davecon70 said:
Now the cistern keeps filling beyond the float even though the float moves up when the water reaches it. Can’t figure out why it’s not shutting off?
Click to expand...
I suspect you have not done the bit in bold properly
Stuckinarut said:
Siamp filling valve washer required, doddle to fit, isolate water, undo the plastic nut, replace washer and refit ensuring the plastic arm lugs are in position, reinstate water supply
Click to expand...
they can be a slight pain to do, even when you have done them before (I have the T-shirt)..

https://shop.siamp.co.uk/videos had a "how to change the inlet valve diaphragm" video.
 
Thank you for the video- very helpful. The arm and valve are in the right place but definitely raising the float either by letting the cistern fill up or doing it manually doesn’t stop the water.

It was a new valve from screwfix. I briefly swapped them back and the float worked again only to completely stop whichever valve was used.

Very strange.
 
johnny2007 said:
This is exactly what happened to me a couple of times I tried to fix fill valves.
For the sake of £10 and 10 minutes work, changing the whole valve is the way to go if you want to avoid a lot of swearing.
Click to expand...
Wonder why that is. Even on the video it says it fixes 7 out of 10 times.

Will try replacing the valve. It’s going to be fiddly getting up and under the toilet!
 

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