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