can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
No hot water, intermittent when air temp drops?
Valliant Eco tec 28?
Vaillant igniting issue ( domestic ) not CH?
how to fix water pressure its down at bottom of grey part?
Why is heating on at night?
Vaillant Ecotech Plus 831 F22 fault?
how do I rectify the fault as detailed below?
how do I vent the heat exchanger?