While you wait for answers, we may have found some information which could help you.
Click here for Boiler Hot Water FaultProblem with the pressure in combi boiler?
how do I rectify the fault as detailed below?
Vailliant turbo max plus 824e?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Advice?
Vaillant condensing boiler ecoTEC plus?