While you wait for answers, we may have found some information which could help you.
Click here for Toilet Repair Grohe
Short burst of water entering cistern ?
Grohe 42181 toilet filler valve leaking?
Grohe seals 14.11.30 4 DAL?
How do I remove the fitting for the flush on my hidden cistern toilet?
GroheEAU2 Dual flush cistern. The large flush button keeps breaking off?
Toilet Push Button not flushing properly?