Water dripping from opening at top of pump?
Vaillant Thermocompact Fault?
Vaillant eco plus 531 boiler?
No hot water, intermittent when air temp drops?
Why is heating on at night?
Vaillant vcw gb242 eh central heating problem?
Vaillant Ecotech Plus 831 F22 fault?
how do I rectify the fault as detailed below?
Vaillant ecotec 937?