Nest thermostat installation help

Old 04-14-17, 05:15 AM
Thread Starter
Join Date: Apr 2017
Location: United States
Posts: 1
Upvotes: 0
Received 0 Upvotes on 0 Posts
Nest thermostat installation help

Hello all
Im trying to install my thermostat and there is one wire that I am not sure where to insert it in the Nest thermostat. I contacted the company and they said I would need to hire a pro to complete the job, but I am trying to save money and get it done myself. Can someone help me and tell me what I can do with the wire?
Name:  nest.jpg
Views: 372
Size:  22.1 KBThe wire in question is the X2 wire shown in the picture
Old 04-14-17, 07:26 AM
Join Date: Feb 2014
Location: USA
Posts: 1,771
Received 0 Upvotes on 0 Posts
Post a pic where these wires connect in the furnace.
Old 04-14-17, 07:30 AM
Join Date: Oct 2016
Posts: 2,137
Received 185 Upvotes on 169 Posts
It appears you have a heat pump. Is that correct?
If that's the case I would suggest using a different thermostat, like something from Honeywell.
Old 04-14-17, 10:42 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 62,067
Received 3,422 Upvotes on 3,068 Posts
Welcome to the forums.

G -----> green -----> G
B -----> blue ------> C*
R -----> red -------> Rc
Y -----> yellow ----> Y1
W ----> black -----> *
X2 ---> white -----> AUX/W2
O ----> orange ----> O/B

The white and black wires were connected backwards on the old stat but since they were jumpered.... it didn't make any difference. Many times the white and black are combined
at the air handler and that may be true here.

Turn power OFF to air handler (inside unit) before doing any wiring.

This assumes you have a Trane heat pump system.
Old 04-23-17, 08:13 PM
Join Date: Nov 2007
Posts: 295
Upvotes: 0
Received 0 Upvotes on 0 Posts
We actually need to know what he has for his aux heat before we can make a wiring/setup recommendation. If it's not done right, a Nest can actually cause costs to RISE with a heat pump setup.

So what kind of setup do you have? It's obviously a heat pump. Is it single or dual stage heat? Is it dual-fuel with a gas furnace or do you have electric coils for your emergency heat?

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: