grohe pneumatic toilet

[mario.cy]

just finished a refurb of a bathroom, has a grohe pneumatic concealed cistern installed around 13 years ago. Before refit water was leaking into bowl, after installation of complete new dual flush valve, water still leaking into bowl, air push button also replaced. Valve sits on a type of cage which has a o ring (no moving parts) could this need replacing? 100% frustrating
many thanks

 

[SimonG]

So a new flush valve was installed onto the old 'cage' ?

I would have changed full unit.

 

[oz-plumber]

Did you re-install the original cistern and replace the flush valve?

If so, did you clean the sealing collar of the original cistern?

 

[mario.cy]

replaced flush valve onto old cage, examined and cleaned both o ring and collar/cage which seemed to look ok

 

[rpm]

So the O-ring is 13yrs old.

 

[moonlight]

I have had a grohe cistern in the past, I also changed the inners. I contacted Grohe after two replacement each only lasting a few weeks, only to be told that the cisterns can warp. That might be your problem. Mine is now sorted and been as good as gold.

 

[mario.cy]

I have had a grohe cistern in the past, I also changed the inners. I contacted Grohe after two replacement each only lasting a few weeks, only to be told that the cisterns can warp. That might be your problem. Mine is now sorted and been as good as gold.

you had to change the complete unit?

 

[moonlight]

you had to change the complete unit?

Yes because the cistern had warped it was grohe adagio