We may have found other answers which could help you.
Click here for Vaillant Vc 242 BoilerVaillant vcw gb242 eh central heating problem?
Vaillant condensing boiler ecoTEC plus?
vaillant ecoTEC plus boiler fault code - how to fix?
Vaillant ecotec 831 plus?
Vaillant 828E - no hot water?
how do I rectify the fault as detailed below?