We may have found other answers which could help you.
Click here for Vaillant Vcw Gb 242 EhVaillant condensing boiler ecoTEC plus?
Vaillant vcw gb242 eh central heating problem?
What does f.25 mean?
Vaillant 828E - no hot water?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Hot water comes and goes!?