Fluid master flush valve passing water

[IJWS15]

As above, it isn’t overflowing, I have changed the seal at the bottom, there is nothing on the sealing surface . . . . It is still allowing some water through

the bottom seal had some blisters on it and has been replaced with a fluid master seal.

Is the only solution to change the valve?

 

[terryplumb]

Have you changed the seal between the flush valve and the cistern ,which would need the cistern removing from the pan to do so ?

 

[IJWS15]

I think I have answered my own question.

You have to fit the seal properly, so it seats fully around the lip on the retainer!

 

[IJWS15]

Have you changed the seal between the flush valve and the cistern ,which would need the cistern removing from the pan to do so ?

I had just changed the seal but not got it seated properly

 

[Wayners]

For the cost just replace the valve.
Sometimes they can leak a bit with crud or damage that's hard to find.
Can be a quick and easy job to replace the valve