Nest thermostat wiring

[beaverstaylor]

Hello, I’m searching for help wiring up my new nest thermostat. It seems that I have 7 wires coming off my old Honeywell thermostat but only have 6 terminals on the nest. Currently I have no place to put the (E) , (O), and (Aux) wires. So is my new nest even compatible? And if so. Is there a diagram you can provide for my specific wiring?

 

 

 

[Houptee · Accepted solution]

Looks like you have a Heat Pump system with Aux heat and Emergency heat.

You cannot have both Aux heat and Emergency heat with the regular Nest but it will still work with your system.

Connect R to R

C to C

G to G

Y to Y

O to O/B

Aux to W

E do not connect tape it off.

During setup tell Nest its a Heat Pump forced air system with Auxiliary Heat (on W).

[beaverstaylor]

This method seems to be working. Thank you!!

[CoolingWizard]

Does your HVAC system have a Humidifier? Sometimes those thermostats can be option setup so that AUX is used for humidifier control.

Ken, The AC Cooling Wizard

[beaverstaylor]

I don’t believe so. But the previous method seems to have it working. Thanks!

[EdwardT]

Hi folks,

@CoolingWizard and Houptee, thanks for the help!

@beaverstaylor, thanks for posting. I'm glad to hear that it's working fine now. Please observe it for now and let us know if anything comes up.

Thanks,

Edward

[EdwardT]

Hey beaverstaylor,

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do. 

Thanks,

Edward

[EdwardT]

Hi beaverstaylor,

I'm just checking in to 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 in 24 hours.

Thanks,

Edward