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F

Fram

Hello! I had to replace the flush mechanism of my loo. I installed the new mechanism mentioned above. All seemed well but the cistern slowly leaks into the pan! What did I do wrong? Thanks!
 
rpm

rpm

Esteemed
Plumber
Try lowering the water level in the cistern, perhaps it is too high.
 
OP
F

Fram

Try lowering the water level in the cistern, perhaps it is too high.
Thanks RPM! But I set in inflow valve to not very high. And the cistern drains itself entirely empty if I shut the water supply off. The outflow valve is clearly not properly closing, no matter what the water level is. And it’s brand new so it shouldn’t do that!
 
Aquarius

Aquarius

Plumber
Gas Engineer
It sounds like it’s the washer betweeen the bayonet cradle of the flush valve and the cistern. Was the surface seating clean, any silicone used or old silicone not removed? Was it tight enough? If it’s the new valvewasher, again check for any debris, does it do this with the cistern lid on or off?
 
OP
F

Fram

It sounds like it’s the washer betweeen the bayonet cradle of the flush valve and the cistern. Was the surface seating clean, any silicone used or old silicone not removed? Was it tight enough? If it’s the new valvewasher, again check for any debris, does it do this with the cistern lid on or off?
thanks Aquarius! I didn’t use any silicone, and I cleaned the cistern before putting the mechanism in. And it doesn’t matter whether the lid is on or not. But I’ll dismantle the whole thing again and have another look. There must be a reason that valve doesn’t properly close. I’ll report back!
 
Aquarius

Aquarius

Plumber
Gas Engineer
And it doesn’t matter whether the lid is on or not.
Good, this proves it’s not the button, pushing down on the flush valve. Therefore it’s either the flush valve washer or the cradle.
 
OP
F

Fram

i have taken it all apart again. Washer and cradle looked pristine! And squeaky clean. And when I put the cistern back and filled it from a bucket it was ok. But after a half flush it started to leak again! I figured the plunger doesn’t come all the way down or something, and weighted it down with some tin to see if that sorted it. But no...
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i have taken it all apart again. Washer and cradle looked pristine! And squeaky clean. And when I put the cistern back and filled it from a bucket it was ok. But after a half flush it started to leak again! I figured the plunger doesn’t come all the way down or something, and weighted it down with some tin to see if that sorted it. But no...
Edit: put another bucket in and there is water coming down from the start. So it’s not the case that all is well until you flush. Hmmm...
 
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Aquarius

Aquarius

Plumber
Gas Engineer
Ok, do you have any additional information or photos? What was in before you replaced the valve? What cistern is installed? Might be that you may have the wrong sized washer?
 

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