how do I rectify the fault as detailed below?
Vaillant Thermocompact Fault?
Vaillant vcw gb242 eh central heating problem?
Valiant thermostat , BMU-Err ?
how to fix water pressure its down at bottom of grey part?
Vailliant turbo max plus 824e?
Vaillant eco plus 531 boiler?
my boiler will no work?
my vaillant boiler is saying a code com on it ?
Why is heating on at night?
Vaillant condensing boiler ecoTEC plus?
how do I vent the heat exchanger?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?
Vaillant igniting issue ( domestic ) not CH?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?