how do I rectify the fault as detailed below?
Hot water comes and goes!?
Vaillant vcw gb242 eh central heating problem?
Vaillant eco plus 531 boiler?
Vaillant ecotec plus 630?
how to fix water pressure its down at bottom of grey part?
how do I vent the heat exchanger?
No hot water, intermittent when air temp drops?
my boiler will no work?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Vaillant condensing boiler ecoTEC plus?
my vaillant boiler is saying a code com on it ?