how do I rectify the fault as detailed below?
my vaillant boiler is saying a code com on it ?
Vaillant F22 fault?
no heating water?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
how to fix water pressure its down at bottom of grey part?
Vaillant Thermocompact Fault?
No hot water, intermittent when air temp drops?
Vaillant Ecotech Plus 831 F22 fault?