While you wait for answers, we may have found some information which could help you.
Click here for Boiler Heating TurbomaxVaillant 828E - no hot water?
Problem with the pressure in combi boiler?
how do I rectify the fault as detailed below?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Vaillant ecotec 831 plus?
Vaillant F22 fault?