We may have found other answers which could help you.
Click here for Vaillant Boiler ChangedVaillant 828E - no hot water?
Vaillant ecotec 831 plus?
Vaillant vcw gb242 eh central heating problem?
how do I rectify the fault as detailed below?
vaillant ecoTEC plus boiler fault code - how to fix?
Vaillant condensing boiler ecoTEC plus?