Can I Use G Wire for C Wire

G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat.

What is G wire on thermostat?

G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat.

What color is C wire?

Blue wires are also called C wires because they are the Common wire. C wires are necessary for any smart thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.