how do I rectify the fault as detailed below?
Vaillant eco plus 531 boiler?
Vaillant ecotec 831 plus?
Valiant thermostat , BMU-Err ?
resetting thermostatat?
my vaillant boiler is saying a code com on it ?
Vaillant 630 error f 85?
how to fix water pressure its down at bottom of grey part?
vaillant vcw gb 282gh?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Hot water supply?
Water dripping from opening at top of pump?