how do I rectify the fault as detailed below?
Vaillant eco plus 531 boiler?
Vaillant 630 error f 85?
how to fix water pressure its down at bottom of grey part?
vaillant vcw gb 282gh?
Valiant thermostat , BMU-Err ?
Vaillant ecomax 828/2 e water pressure sensor?
How many factors causes f22 fault?
my vaillant boiler is saying a code com on it ?
Water dripping from opening at top of pump?
no heating water?
Boiler over pressure on the hot-water side?
Vaillant condensing boiler ecoTEC plus?
Vaillant ecotec 831 plus?
Vaillant igniting issue ( domestic ) not CH?