how do I rectify the fault as detailed below?
Vaillant ecotec plus 630?
Vaillant ecomax 828/2 e water pressure sensor?
Vaillant Thermocompact Fault?
No hot water, intermittent when air temp drops?
Vaillant condensing boiler ecoTEC plus?
Vaillant Ecotech Plus 831 F22 fault?
how to fix water pressure its down at bottom of grey part?
resetting thermostatat?
vaillant ecoTEC plus boiler fault code - how to fix?
Vaillant 630 error f 85?
Vaillant eco plus 531 boiler?