While you wait for answers, we may have found some information which could help you.
Success
Message
room thermostats?
hot water flow problem?
hot water out of cold water tap?
No heating but plenty of hot water ?
Hot water cools when tap is opened fully?
diaphram?
how to fix problem?
no hot water in taps?
Vaillant ecomax 828/2 e water pressure sensor?
cost of new expansion vessel?
dhw diaphram?
looking for a pump?