Vaillant 630 error f 85?
Valiant thermostat , BMU-Err ?
vaillant ecoTEC plus boiler fault code - how to fix?
Boiler over pressure on the hot-water side?
No hot water, intermittent when air temp drops?
Problem with the pressure in combi boiler?
how to fix water pressure its down at bottom of grey part?
Vaillant ecotec 831 plus?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Hot water comes and goes!?
my vaillant boiler is saying a code com on it ?
Vaillant eco plus 531 boiler?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
resetting thermostatat?
how do I rectify the fault as detailed below?