how do I rectify the fault as detailed below?
Vaillant eco plus 531 boiler?
Vaillant vcw gb242 eh central heating problem?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Vaillant Ecotech Plus 831 F22 fault?
Advice?
Vaillant 828E - no hot water?
Problem with the pressure in combi boiler?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Vaillant igniting issue ( domestic ) not CH?
Vaillant Thermocompact Fault?
Vailliant turbo max plus 824e?
No hot water, intermittent when air temp drops?
how to fix water pressure its down at bottom of grey part?
Vaillant F22 fault?
Vaillant ecotec plus 630?
my vaillant boiler is saying a code com on it ?
how do I vent the heat exchanger?
Why is heating on at night?
Boiler over pressure on the hot-water side?
Valiant thermostat , BMU-Err ?