my vaillant boiler is saying a code com on it ?
how do I rectify the fault as detailed below?
What does f.25 mean?
No hot water, intermittent when air temp drops?
Vaillant F22 fault?
how do I vent the heat exchanger?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Problem with the pressure in combi boiler?
vaillant ecoTEC plus boiler fault code - how to fix?
Boiler over pressure on the hot-water side?
Valliant Eco tec 28?
how to fix water pressure its down at bottom of grey part?
Vaillant eco plus 531 boiler?
Vailliant turbo max plus 824e?
Vaillant vcw gb242 eh central heating problem?