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