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Nest thermostat wiring

beaverstaylor
Community Member

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?

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1 Recommended Answer

Houptee
Silver Product Expert
Silver Product Expert

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).


Houptee -- NJ Master HVAC Licensed Contractor

View Recommended Answer in original post

7 REPLIES 7

Houptee
Silver Product Expert
Silver Product Expert

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).


Houptee -- NJ Master HVAC Licensed Contractor

This method seems to be working. Thank you!!

CoolingWizard
Platinum Product Expert
Platinum Product Expert

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

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner. If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.

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

EdwardT
Community Specialist
Community Specialist

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
Community Specialist
Community Specialist

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
Community Specialist
Community Specialist

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