
how do I rectify the fault as detailed below?
Valiant thermostat , BMU-Err ?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
my vaillant boiler is saying a code com on it ?
Hot water comes and goes!?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?
No hot water, intermittent when air temp drops?
how do I vent the heat exchanger?