Geberit dual pneumatic flush concealed cistern

[Brian Morgan]

I have a Geberit concealed cistern . This has a dual pneumatic flush, and has worked without any problems for a few years now. The short flush continues to work normally but the longer (6 litre) flush no longer flushes fully which results in solid waste not being flushed. I have checked the flexible tube and they appear to be in good order. Can you advise as to what my next step would be in resolving this issue.

 

[Brix]

Hello. Did you resolve this? I've what sounds like a similar problem.