C Wire? Not sure if I have it.

[OrangeC]

The system is a cooling and heating furnace in the basement with an A/C fan outside. Not sure if the black is the C wire or the RC is the C wire. How would i go about wiring these wires to the nest thermostat?

[MelbaDT]

Hey OrangeC, 

Thanks for the photo and for reaching out. 

Based on the terminal labels of your current thermostat, you don't have a C wire. A C or a common wire is supposed to be connected to a C terminal which your thermostat does not have. 

Best, 

Melba

[MelbaDT]

Hey there, 

Checking back in should you still need our help here. Let us know by replying to this thread. 

Best, 

Melba

[Ryan_G]

Hey there,

Thanks for being here in the Google Nest Community. 

I'd like to bump in here and make sure that you’ve seen our response.
Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Have a great day.

Best regards,
Ryan