Vaillant vcw gb242 eh central heating problem?
Boiler over pressure on the hot-water side?
my vaillant boiler is saying a code com on it ?
Valiant thermostat , BMU-Err ?
vaillant ecoTEC plus boiler fault code - how to fix?
how do I vent the heat exchanger?
how to fix water pressure its down at bottom of grey part?
What does f.25 mean?
how do I rectify the fault as detailed below?
Vaillant Thermocompact Fault?
Problem with the pressure in combi boiler?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?