We may have found other answers which could help you.
Success
Message
Vaillant F22 fault?
Vaillant 828E - no hot water?
Vaillant ecotec 831 plus?
how to fix water pressure its down at bottom of grey part?
Vaillant vcw gb242 eh central heating problem?
vaillant ecoTEC plus boiler fault code - how to fix?
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?
Hot water comes and goes!?
how do I rectify the fault as detailed below?