We may have found other answers which could help you.
Success
Message
Vaillant 828E - no hot water?
Vaillant F22 fault?
What does f.25 mean?
Vaillant condensing boiler ecoTEC plus?
Vaillant ecotec 831 plus?
Hot water comes and goes!?
how do I rectify the fault as detailed below?
Vaillant vcw gb242 eh central heating problem?
Vaillant eco plus 531 boiler?
how to fix water pressure its down at bottom of grey part?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
vaillant ecoTEC plus boiler fault code - how to fix?