Yes, thank you so much for this forum! Our 4 year old V&B was constantly leaking in the bowl and refilling the cistern every 5 mins. This was what I did:
1. skipped the checking the flush valve for bubbles & decided to just buy a new one as popping them is only a temporary solution as the valve is faulty and problem should be permanetly fixed when buying a new one
2. emailed GEBERIT who were unhelpful in their response (so skip this bit)
3. Headed straight to Chesters (NZ) for the part called a flush valve (they said it was a common problem) cost $8 NZ. They will show you how to take off the control unit if you ask nicely
4. Turned off water valve located under cistern lid and flushed toilet so water drained
5. Wiggled and pulled at side clips on control unit (its the biggest part in the cistern). Pulled off old valve (just a fancy word for round silicone rubber ring) and put on the new ring (it sits there with no adhesive needed). Pushed the control unit back in & turned the water tap on and replaced the cistern lid
6. Took all of 5 mins work and my toilet is working perfectly again (Oh, Im a mum not a plumber!)
7. Checked old valve and yes 3 big bubbles
8. Checked toilet there's no refilling sound and no leaking into the bowl... easy and saves over $120 for a callout
Good luck!
J
September 2015