Want to change Honeywell thermostat for a Nest Learning.

[garyham]

This is the best picture I have. It's what was there before. 

I want to change it out to a Nest Learning Thermostat, but unsure of the wiring, since it's not really labeled. Wanted to check on compatibility first. I am prepared to hire someone to install, but wanted to first check and see if compatible.

Assistance would be appreciated.

Thanks

[Patrick_Caezza]

Everything is labeled, but the black wires on the C and RC terminal concern me a little bit as they look like tinned stranded wires. I see a red wire that looks like it has been removed from the RC terminal at some point, and possibly an external 24Vac transformer was installed, so there would be a C wire.

Try this,

Black - C to C

Black - RC to Rc

Orange - W-O/B to OB

Yellow - Y to Y1

Green - G to G

White - W2-AUX/E to W2/AUX (set as AUX heat)

[garyham]

Thanks Patrick. I will try this and let you know.

[Ryan_G]

Hi garyham,

Thanks for reaching out here in the Google Nest Community.

I'd like to jump in here and check on how's it going with your Nest Thermostat. Let us know if you need more help by replying to this thread.

Thank you for your help, Patrick_Caezza.

Regards,
Ryan 
 

[MelbaDT]

Hey there, 

How's it going with your thermostat now? Still need our help?

Best, 

Melba

[garyham]

I have been away for a bit and haven't had a chance to get back to it. Going to try to work on it in the coming week.

Thanks

[MelbaDT]

Hey there, 

Got it and thanks for getting back to us. No worries — we're not in a rush here. We'll keep the thread open until next week.

Keep us posted.

Best, 

Melba

[MelbaDT]

Hey there, 

Got it and thanks for getting back to us. No worries — we're not in a rush here. We'll keep the thread open until next week.

Keep us posted.

Best, 

Melba

[garyham]

Hi Ryan,

I have been away for a bit and haven't had a chance to get back to it. Going to try to work on it in the coming week.

Thanks

[garyham]

Just wanted to give an update. I was able to install the Nest yesterday. Initially it didn't work, so I connected the Red wire to Rh, and everything worked.

Thanks for your assistance.

Gary

[EdwardT]

Hi garyham,

Thanks for the update. I'm glad to hear that you were able to get it to work. Please observe it for now and let us know if anything comes up.

Thanks,

Edward

[garyham]

Thanks Edward. I have been keeping an eye on it, just to make sure it is operating correctly.

Thanks,

Gary

[EdwardT]

Hi garyham,

Thanks for the response. Based on the photos and your description, it looks like your Nest Thermostat is wired correctly. Let us know if you have other questions and we'd be glad to assist you.

Thanks,

Edward

[EdwardT]

Hi garyham,

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

[garyham · Accepted solution]

Hi Edward, so far things are running smoothly. Thanks for checking.

Gary

[EdwardT]

Hi garyham,

Thanks for the update. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

Thanks,

Edward