Wiring Compatibility for Nest Thermostat (non-learning)

[Junkster]

Looking to purchase Nest Thermostat for my heat pump system, but before doing so I want to understand if my current wiring will work and what it should be especially as I have a R/RC jumper.

[Patrick_Caezza · Accepted solution]

Yes, your current thermostat is compatible with the Google Nest Thermostat.

Try this wiring.

White - AUX/E to W (set as Aux Heat)

Green - G to G

Orange - O/B to */OB

Blue - Not used

Yellow - Y to Y

Red - R to R (jumper to RC not needed)

It looks like they just connected the blue wire to keep it out of the way. I would check and see how it is connected at the terminal block on the control board in the furnace/air handler. Hopefully, they have it connected to the C terminal. If they do, then you can connect it to the C terminal on the Nest. 

If it's not connected to anything, then connect it to the C terminal on both ends.

When the Google Home App asks for the wire that you have, select these.

W/W1/, Y/Y1, G/G1, O/B, and R

Also select C if you install a C wire.

[MelbaDT]

Hey folks, 

Thanks again for helping, Patrick_Caezza. 

Junkster, glad to hear that you've got the answer you're looking for. Let us know if you have further questions about this. 

Best, 

Melba

[MelbaDT]

Hi, 

We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.
 

Best, 

Melba