While you wait for answers, we may have found some information which could help you.
Click here for Trickle Water CisternGrohe 42181 toilet filler valve leaking?
how do I change the bellows in the push button unit for the grohe cistern?
Have I been charged way to much for having a loo mended?
Grohe push button toilet attached to saniflow ?
Slow fill of toilet cistern?
The push button on my Grohe Adagio stopped flushing ?