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