W
wimmer
I decided to change my digital thermostat for one with a backlight, only problem is there are only 2 wires (plus a blue and green/yellow taped up). When I connect the brown to the L and the black to L1 on the other side of the switch on the diagram, (as removed from the old thermostat), there is no display. As the new one obviously needs constant power for the display, I obviously need to connect something else. There are 4 terminals on the new one N1 N (AC IN) L L1 - thanks anyone.