Showing results for 
Search instead for 
Did you mean: 

nest learning thermostat and nest thermostat e compatibility

Community Member

I have a nonsmart thermostat that has 4 wires-rh, 0, G, Y/y2.  There is no C wire.

The compatibility checker does not. show a Y/y2 wire, only shows, Y,or Y1, or Y2.

Is my Y/y2  wire compatible for hookup on the learning thermostaat and /or the Themostat E?

Is my G wiring compatible with either nest?

Do I need an adaptor kit because of this wiring?

Also, dont see a control board wiring panel in the furnace? Where is it?


Silver Product Expert
Silver Product Expert

Yes both models will work the Y is just Y it turns on the outside AC unit.

G turns on the fan

Rh is power +

O is usually for heat pumps only is this a heat pump a/c system?

Do you have extra wire in the cable that is not connected? Usually the cable has 5 wires and one might be wrapped around the cable in the wall and can be used for the common.

You need to go to the system and locate the thermostat wires and follow them to the terminal strip and post a pic of where they go with the screw labels visible.

Houptee -- NJ Master HVAC Licensed Contractor

Platinum Product Expert
Platinum Product Expert

Post a picture of the original thermostat's wiring here.

Hey folks, 

Thanks again for helping here, @Houptee and @Patrick_Caezza
@artnuvo, I hope you've got the answer you're looking for. If you're still in need of any assistance, feel free to let us know. 


Community Specialist
Community Specialist

Hi folks,


I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.




Community Specialist
Community Specialist

Hey there,


I wanted to check in, and let you know that I will be locking the thread in 24 hours.


Best regards,