Vaillant Thermocompact Fault?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Vaillant 828E - no hot water?
No hot water, intermittent when air temp drops?
Boiler over pressure on the hot-water side?
Valiant thermostat , BMU-Err ?
Vaillant Ecotech Plus 831 F22 fault?
Hot water comes and goes!?
Problem with the pressure in combi boiler?