Vaillant vcw gb242 eh central heating problem?
Boiler over pressure on the hot-water side?
Vaillant ecomax 828/2 e water pressure sensor?
how to fix water pressure its down at bottom of grey part?
vaillant vcw gb 282gh?
Valiant thermostat , BMU-Err ?
Vaillant 828E - no hot water?
No hot water, intermittent when air temp drops?
my vaillant boiler is saying a code com on it ?
vaillant ecoTEC plus boiler fault code - how to fix?
my boiler will no work?
how do I rectify the fault as detailed below?