While you wait for answers, we may have found some information which could help you.
Success
Message
another with a Valliant showing F22 and 0.4 bar fault?
Valliant Turbo Max Non Condensing RS boiler?
Vallliant F75 error message?
Valliant Boiler F22 Error?
Vallient boiler showing f28 but pressure is fine?
No hot water [Valliant boiler, Turbomax VUW 242]?
Valliant Eco Tech 615 boiler ?
VCW GB 242 EH Valliant Boiler?
Valliant Boiler?
Boiler-Valliant Ecotec Plus-won't power up, display off?
flashing f22 message?
eco digital 831 manual request?