flush problem with pneumatic system

[simonoaks]

Hi,

I have a closed Geberit toilet system with dual pneumatic flush. It was installed about 6 years ago and has a small front panel access where the flush buttons are, but no top access (without removing fitted top and removing a sink).

Anyway, left hand (single action) flush does nothing, and recently the right hand (big flush) has deteriorated so that it now only just flushes with 4 pushes, but this too is now looking like it will no longer hold out for much longer.

I know very little about pluming, and nothing about this pneumatic system. I have taken the front panel off and there is a small blue tube running out of left putton and a white one running out of the right one, into a plastic valve system.

Pushing the left button has no resistance at all and no air is pushed, pushing the right button has resistance but the air flow only seems to cause a small amount of flushing. Can anyone tell me what tests I can do to isolate what the fault might be e.g. tubes, button action, main valve etc, or if there is likely to be a common fault that occurs over a period of time with these sorts of systems.

thanks

Simon

 

[Lower]

Its the button that's failed. Get a new one.

 

[simonoaks]

do you mean the front fascia buttons or the the whole unit that sits behind the buttons? How does a button fail, it is just a piece of metal that you push, or does 'button' mean the mechanism that fits to the front panel and the chrome button?

cheers