how do I rectify the fault as detailed below?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Vaillant condensing boiler ecoTEC plus?
Vaillant vcw gb242 eh central heating problem?
my vaillant boiler is saying a code com on it ?
Vaillant Thermocompact Fault?
No hot water, intermittent when air temp drops?
resetting thermostatat?
how to fix water pressure its down at bottom of grey part?