We may have found other answers which could help you.
Click here for Combi Water TurnedVaillant condensing boiler ecoTEC plus?
Problem with the pressure in combi boiler?
Vaillant vcw gb242 eh central heating problem?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Vaillant F22 fault?
Vaillant ecotec 831 plus?