vaillant ecoTEC plus boiler fault code - how to fix?
No hot water, intermittent when air temp drops?
Valliant Eco tec 28?
Problem with the pressure in combi boiler?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Valiant thermostat , BMU-Err ?
resetting thermostatat?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
how do I rectify the fault as detailed below?