my vaillant boiler is saying a code com on it ?
Vaillant 828E - no hot water?
Vaillant ecomax 828/2 e water pressure sensor?
Vaillant 630 error f 85?
Hot water comes and goes!?
how to fix water pressure its down at bottom of grey part?
Vaillant igniting issue ( domestic ) not CH?
Boiler over pressure on the hot-water side?
No hot water, intermittent when air temp drops?