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