how do I rectify the fault as detailed below?
Vaillant 828E - no hot water?
Water dripping from opening at top of pump?
Boiler over pressure on the hot-water side?
Valiant thermostat , BMU-Err ?
my vaillant boiler is saying a code com on it ?
my boiler will no work?
Vaillant ecomax 828/2 e water pressure sensor?
No hot water, intermittent when air temp drops?