my vaillant boiler is saying a code com on it ?
Valiant thermostat , BMU-Err ?
Vaillant condensing boiler ecoTEC plus?
how do I rectify the fault as detailed below?
Water dripping from opening at top of pump?
No hot water, intermittent when air temp drops?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
my boiler will no work?
Hot water comes and goes!?