No hot water, intermittent when air temp drops?
Vaillant 630 error f 85?
how to fix water pressure its down at bottom of grey part?
Hot water comes and goes!?
Vaillant 828E - no hot water?
Vaillant vcw gb242 eh central heating problem?
how do I rectify the fault as detailed below?
Why is heating on at night?
Valiant thermostat , BMU-Err ?