While you wait for answers, we may have found some information which could help you.
Click here for Light Boiler Seconds FittedAdvice?
Vailliant turbo max plus 824e?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Vaillant F22 fault?
Problem with the pressure in combi boiler?
Vaillant vcw gb242 eh central heating problem?