topic Re: Nest Undetected Wires Y, G, W in Nest Thermostats

Nest Undetected Wires Y, G, W

briannadr — Tue, 28 May 2024 22:41:54 GMT

My nest thermostat is working (I.e, fan is on, cooling the house down), but my Nest is showing undetected wires for wire Y, G, and W. Any ideas on what the issue could bee? I stripped the wires and cut them before install to ensure a clean end.

Re: Nest Undetected Wires Y, G, W

Patrick_Caezza — Wed, 29 May 2024 04:03:10 GMT

@briannadr

Do you have a picture of the original thermostat's wiring that you can post here?

When you were setting the thermostat up in the Google Home app, which wires did you tell it you had installed?

Re: Nest Undetected Wires Y, G, W

briannadr — Wed, 29 May 2024 12:56:40 GMT

@Patrick_Caezza

Here is the other thermostat wiring: https://imgur.com/a/thermostat-xcnRXIt

When I set it up, the app told me these wires were undetected but I proceeded anyway because I was trying to troubleshoot.

Re: Nest Undetected Wires Y, G, W

Patrick_Caezza — Wed, 29 May 2024 21:18:45 GMT

@briannadr

You have a Google Nest Thermostat (mirrored display), correct?

Did you wire it like this?

Green - G to G

White - W to W

Blue - C to C

Yellow - Y to Y

Red - R to R (jumper to Rc not needed)

Did you turn the breaker off before you moved any wires?

Re: Nest Undetected Wires Y, G, W

briannadr — Wed, 29 May 2024 21:44:16 GMT

@Patrick_Caezza Yes, I did all of that with the breakers off. As I mentioned, the AC is blowing cold but I have not tested the heater. Is there any chance I have a faulty base that is registering the wires as not detected even though they may be detected?

Re: Nest Undetected Wires Y, G, W

Patrick_Caezza — Wed, 29 May 2024 23:41:50 GMT

@briannadr

Yes, it is possible that you have a bad base.

One last thing to try.

Do you have access to the furnace? if you do can you post a picture of where the thermostat cable connects in it and what each wire connects to?

Re: Nest Undetected Wires Y, G, W

briannadr — Fri, 31 May 2024 14:53:11 GMT

@Patrick_Caezza

I do not have access to the furnace, however I have confirmed that the AC and heater are both working and the fan automatically turns on and off.

I will assume that I can dismiss the notification and the Nest will continue running like normal. It appears that everything is functioning even though the base can’t detect all the wires.

Re: Nest Undetected Wires Y, G, W

Patrick_Caezza — Fri, 07 Jun 2024 22:21:04 GMT

@briannadr

Can you post a picture of the error message that you are seeing?