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?
Vaillant ecomax 828/2 e water pressure sensor?
No hot water, intermittent when air temp drops?
Boiler over pressure on the hot-water side?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?
Problem with the pressure in combi boiler?
Vaillant vcw gb242 eh central heating problem?