how do I rectify the fault as detailed below?
Valiant thermostat , BMU-Err ?
Hot water comes and goes!?
resetting thermostatat?
my vaillant boiler is saying a code com on it ?
how to fix water pressure its down at bottom of grey part?
What does f.25 mean?
Vaillant Ecotech Plus 831 F22 fault?
Vaillant igniting issue ( domestic ) not CH?
Vaillant Thermocompact Fault?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Problem with the pressure in combi boiler?
Vaillant eco plus 531 boiler?
No hot water, intermittent when air temp drops?
Vaillant vcw gb242 eh central heating problem?
vaillant ecoTEC plus boiler fault code - how to fix?
Why is heating on at night?
Vaillant F22 fault?