my vaillant boiler is saying a code com on it ?
How many factors causes f22 fault?
how do I rectify the fault as detailed below?
Vaillant ecotec 831 plus?
No hot water, intermittent when air temp drops?
Water dripping from opening at top of pump?
Vaillant 828E - no hot water?
Vaillant vcw gb242 eh central heating problem?
Valiant thermostat , BMU-Err ?