While you wait for answers, we may have found some information which could help you.
Success
Message
Vaillant 828E - no hot water?
Vaillant vcw gb242 eh central heating problem?
Vaillant F22 fault?
how to fix water pressure its down at bottom of grey part?
Advice?
Vaillant condensing boiler ecoTEC plus?
Vailliant turbo max plus 824e?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Problem with the pressure in combi boiler?
Vaillant ecotec 831 plus?
Vaillant eco plus 531 boiler?
how do I rectify the fault as detailed below?