how do I rectify the fault as detailed below?
Hot water comes and goes!?
No hot water, intermittent when air temp drops?
Valiant thermostat , BMU-Err ?
how to fix water pressure its down at bottom of grey part?
Vaillant F22 fault?
Vaillant vcw gb242 eh central heating problem?
Water dripping from opening at top of pump?
Vaillant eco plus 531 boiler?
vaillant ecoTEC plus boiler fault code - how to fix?
Vaillant ecotec plus 630?
Boiler over pressure on the hot-water side?
Vaillant Ecotech Plus 831 F22 fault?
Vaillant condensing boiler ecoTEC plus?
Vaillant igniting issue ( domestic ) not CH?