While you wait for answers, we may have found some information which could help you.
Click here for Boiler Vaillant Turbomax
Vaillant vcw gb242 eh central heating problem?
Problem with the pressure in combi boiler?
Vaillant F22 fault?
Vaillant condensing boiler ecoTEC plus?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Advice?