My geberit wont stop running!what part can i replace to stop water going to waste

Call whomever installed it and have it replaced or repaired under warranty.

wd40 possibly

wait for the new washer/ valve to settle in
or turn down the inlet water tap a bit

what does this really mean
tank topping up with water and re filling occasionally

in the wrong way or too tight or the wrong part ?

It's adjustable. Remove the drain lever from the side of the tub. Now you can withdraw the whole drain assembly. Clean it well, then reinsert it to see if that fixed the problem. If not, try adjusting it longer.

I have the same problem with my new Gerberit 800 plus fitted last Thursday, it will not stop flushing in the manual it says valve problem contact service dept. Joke they dont give a number for them.

Shut off main water supply
shut off water value going to your wall mounted toilet.
look under your apartment or the room ajoining the wall unit.
look for hidden wall space above unit

need to adjust the float [water level shut off] lower or the water valve needs repair sometimes the valves stick and tapping the unit free's it up

Hi I have exactly the same problem, in fact it could have been me writing this - 3 toliets fine, main bathroom hisses. The Geberit flushing ciphen on the left (the smaller one) has been replaced and there is still a problem. If you look carefully,the water level needs to come up over the lip of an opening on the Geberit part and this causes the valve mechanism to shut off and stop the hissing. It is fine for about 40 minutes and then the hissing starts again if you don't flush it. The reason is that the water level has gone down but there is no obvious signs of where the water is going. It could be that the central flush mechanism is leaking slightly. I am going to replace this part next. If I were you I'd see if you are getting any water leakage into the pan when toilet not in use to see if the water level in the cistern is going down James T

If your located in the U.S. you can get generic replacements for the valve at Ace hardware or Dimond or Hoe Depot.

I hate to say it but you may need a pro on this one, if you want I can try to walk you threw it but let me know. [email protected]