Nest Thermostat Wiring Diagram C Wire. Otherwise, the arrangement will not function as it should be. If you don’t have a c wire in your current wiring (between the furnace and thermostat), the best solution is.
It reveals the elements of the circuit as streamlined forms, as well as the power as well as signal connections in between the devices. Green wire for the fan; A (green label) = green wire.
Green wire for the fan;
Why is my nest thermostat not working with a c home improvement. A (green label) = green wire. The device is relatively inexpensive, and it’s easy to install. The nest thermostat does not need this wire.