my vaillant boiler is saying a code com on it ?
how do I rectify the fault as detailed below?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Valliant Eco tec 28?
Problem with the pressure in combi boiler?
Vaillant igniting issue ( domestic ) not CH?
Advice?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Vaillant condensing boiler ecoTEC plus?
Vaillant ecotec plus 630?
how to fix water pressure its down at bottom of grey part?
my boiler will no work?
No hot water, intermittent when air temp drops?
Vaillant eco plus 531 boiler?
Boiler over pressure on the hot-water side?
Vaillant Ecotech Plus 831 F22 fault?
Valiant thermostat , BMU-Err ?
vaillant ecoTEC plus boiler fault code - how to fix?