my vaillant boiler is saying a code com on it ?
how do I rectify the fault as detailed below?
my boiler will no work?
Why is heating on at night?
Vaillant 630 error f 85?
No hot water, intermittent when air temp drops?
Water dripping from opening at top of pump?
Vaillant ecotec 831 plus?
How many factors causes f22 fault?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Valiant thermostat , BMU-Err ?
vaillant ecoTEC plus boiler fault code - how to fix?