While you wait for answers, we may have found some information which could help you.
Click here for Grohe Push Buttonhow do I change the bellows in the push button unit for the grohe cistern?
Grohe 42181 toilet filler valve leaking?
The push button on my Grohe Adagio stopped flushing ?
Grohe push button toilet attached to saniflow ?
Slow fill of toilet cistern?
Replacement of bellows in Grohe air button?