my vaillant boiler is saying a code com on it ?
how do I vent the heat exchanger?
Vaillant Thermocompact Fault?
Vaillant vcw gb242 eh central heating problem?
Vaillant 828E - no hot water?
Hot water comes and goes!?
Valiant thermostat , BMU-Err ?
how to fix water pressure its down at bottom of grey part?
Vaillant igniting issue ( domestic ) not CH?
Vaillant Ecotech Plus 831 F22 fault?
vaillant ecoTEC plus boiler fault code - how to fix?
my boiler will no work?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Advice?
Boiler over pressure on the hot-water side?