Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Valiant thermostat , BMU-Err ?
resetting thermostatat?
Vaillant eco plus 531 boiler?
Vaillant vcw gb242 eh central heating problem?
my vaillant boiler is saying a code com on it ?
vaillant ecoTEC plus boiler fault code - how to fix?
how do I rectify the fault as detailed below?
Hot water supply?