01-01-2023 06:57 PM
The W is connected to a blue wire and the C does not have anything connected to it. There is a white wire however it is not connected to anything.
01-02-2023 12:27 AM
I would check your furnace out and see exactly what the blue wire is connected too and match that to your new one.
01-02-2023 06:01 AM
What kind of system do you have?
Is it a Heat Pump? Or a Nat gas furnace with AC?
You need to use one of the extra wires as a C wire and connect it to the furnace C terminal screw.
01-02-2023 07:29 AM
Thanks. i don’t have a heat pump. Natural gas furnace
01-02-2023 07:53 AM
I suggest you go to the furnace and remove the cover.
Locate the terminal screws where the thermostat wires connect.
I would fix the strange wire colors they used and put the White wire on furnace W
Put the Blue wire on furnace C common (or if it is a Trane they call it B)
Then go back to the Nest and put
Red in RC
White in W1
Blue in C
G in G
Y in Y
01-02-2023 01:08 PM
Thanks Houptee. I checked the white wire just hanging there and it has 12 mV power from the multimeter. I’m wondering if it was installed without the white wire since the thermostat runs off battery- not sure why. I’m still looking for the terminal near the furnace to confirm the wiring
01-02-2023 04:43 PM
Ok..good news. I installed the nest using the following wires and it is working and responding.
W - Blue
Rc - red
G - green
Y - yellow
W - was left not connected.
should there be any concern with that setup?
01-02-2023 05:07 PM
If it is getting good power when you do the power test and you get good readings it should be ok.
But connecting a C wire is always the best thing to do on these smart thermostats.
You just remove the front cover on the furnace and you will see the wires and screws in a row R Y G C W etc etc.
If you want to make it standardized to the normal color code you can move white to W and blue to C.
This video shows you how to test if you need to attach the C wire but i would do it anyway even if you have decent voltage.
01-03-2023 05:33 AM
I figured that was the case. As king as you remember for another time. You could put a small label on the wires coming out of the wall
01-03-2023 05:36 AM
Something came out wrong on my last post. Just saying label the wires. Blue being where White should go. I believe white is for heat.
01-06-2023 09:36 PM
01-11-2023 05:00 PM
Hey there,
I just wanted to follow up to see if you still need our help. Please let us know as we would be happy to answer any questions you may have.
Thanks,
Archie
01-12-2023 10:35 PM
Hello there,
Just checking in to make sure that you've seen our responses. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.
Thanks,
Archie
01-13-2023 03:33 PM
It does work : ) thanks for the help
I do need a backing plate do you know where I can get that?
01-13-2023 10:34 PM
Hey Jay_Utah,
That's good to hear! You can fill out this form and let us know once you're done.
Thanks,
Archie
01-20-2023 06:10 PM
Hey Jay_Utah,
We got your form — thanks for filling it out. Our team will reach out to you via email to further assist you. Also, please be advised that this thread will be locked after 24 hours.
Thanks,
Archie