vaillant ecoTEC plus boiler fault code - how to fix?
Vaillant Thermocompact Fault?
Why is heating on at night?
Hot water comes and goes!?
No hot water, intermittent when air temp drops?
my vaillant boiler is saying a code com on it ?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
how do I rectify the fault as detailed below?