how do I rectify the fault as detailed below?
Valiant thermostat , BMU-Err ?
No hot water, intermittent when air temp drops?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Problem with the pressure in combi boiler?
my vaillant boiler is saying a code com on it ?
Vaillant ecotec plus 630?
how to fix water pressure its down at bottom of grey part?
Vailliant turbo max plus 824e?
Vaillant F22 fault?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?
Vaillant condensing boiler ecoTEC plus?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
my boiler will no work?
Why is heating on at night?