Vaillant 828E - no hot water?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
how do I rectify the fault as detailed below?
Advice?
No hot water, intermittent when air temp drops?
how to fix water pressure its down at bottom of grey part?
my boiler will no work?
how do I vent the heat exchanger?
my vaillant boiler is saying a code com on it ?