how to fix water pressure its down at bottom of grey part?
Vaillant eco plus 531 boiler?
Vaillant F22 fault?
Why is heating on at night?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
how do I vent the heat exchanger?
Vaillant vcw gb242 eh central heating problem?
Hot water comes and goes!?
my vaillant boiler is saying a code com on it ?
Valiant thermostat , BMU-Err ?
my boiler will no work?
how do I rectify the fault as detailed below?