We may have found other answers which could help you.
Click here for Boiler Valliant Fault
Valliant Turbo Max Non Condensing RS boiler?
No hot water [Valliant boiler, Turbomax VUW 242]?
Vallliant F75 error message?
another with a Valliant showing F22 and 0.4 bar fault?
Valliant Eco Tech 615 boiler ?
VCW GB 242 EH Valliant Boiler?