how do I rectify the fault as detailed below?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
my vaillant boiler is saying a code com on it ?
how to fix water pressure its down at bottom of grey part?
Why is heating on at night?
my boiler will no work?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?
Valiant thermostat , BMU-Err ?
Valliant Eco tec 28?
Vaillant Ecotech Plus 831 F22 fault?
Problem with the pressure in combi boiler?
Vailliant turbo max plus 824e?