vaillant ecoTEC plus boiler fault code - how to fix?
how to fix water pressure its down at bottom of grey part?
Vaillant eco plus 531 boiler?
Water dripping from opening at top of pump?
Vaillant igniting issue ( domestic ) not CH?
how do I rectify the fault as detailed below?
my vaillant boiler is saying a code com on it ?
No hot water, intermittent when air temp drops?
Valiant thermostat , BMU-Err ?