We may have found other answers which could help you.
Click here for Vaillant Turbomax Vuwvaillant ecoTEC plus boiler fault code - how to fix?
Vaillant 828E - no hot water?
Hot water comes and goes!?
Vaillant F22 fault?
how do I rectify the fault as detailed below?
Vaillant vcw gb242 eh central heating problem?