Valiant thermostat , BMU-Err ?
how do I rectify the fault as detailed below?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
my vaillant boiler is saying a code com on it ?
Vaillant vcw gb242 eh central heating problem?
Vaillant condensing boiler ecoTEC plus?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Vaillant 630 error f 85?
Hot water comes and goes!?
Problem with the pressure in combi boiler?
how to fix water pressure its down at bottom of grey part?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?