topic Re: cannot connect, wires undetected in Nest Thermostats

cannot connect, wires undetected

sviscarra — Sun, 01 Jan 2023 09:03:45 GMT

I've just attempted to install my thermostat.

It keeps saying "no power" and "y c w g r" not detected.

I've turned the breaker off. Waited. Turned it back on and re-attempted the setup thru Google Home app, with the same results.

I cannot get it to recognize the c wire. Or connect to the wifi.

Any help would be appreciated.

Re: cannot connect, wires undetected

David_K — Mon, 02 Jan 2023 15:37:45 GMT

There's some good steps to try for this here:

Thermostat wire undetected or unconfigured - Google Nest Help

Re: cannot connect, wires undetected

sviscarra — Mon, 02 Jan 2023 16:49:02 GMT

the wires are clean.

and unfortunately i cannot access any settings on the thermostat cause it won't connect.

Re: cannot connect, wires undetected

David_K — Mon, 02 Jan 2023 17:31:27 GMT

Strange that's it's not detecting any of your wires. Has it ever worked or does it always display that error? Do you know what gauge wire it is? Anything smaller than 22 gauge wire could be too thin for Nest Thermostat to detect.

Re: cannot connect, wires undetected

sviscarra — Mon, 02 Jan 2023 17:41:41 GMT

It hasn't connected since I purchased it. Just throws that error.

I believe the gauge is not too small. It appears to fit in the connectors pretty well.

Re: cannot connect, wires undetected

David_K — Mon, 02 Jan 2023 18:04:08 GMT

Let me ask a community specialist if there's any further troubleshooting options or steps we can try here.

Re: cannot connect, wires undetected

Markjosephp — Mon, 02 Jan 2023 18:56:14 GMT

Hello there,

Thanks for helping here, @David_K.

@sviscarra, It's possible that the system won't supply the thermostat or a particular wire with any power at all, or the common wire may not be properly grounded. But I wanted to stop by and see how I could help.

Please give these steps a try:

Make sure that the power to your HVAC system is turned on at the breaker.
Remove the C wire and leave it disconnected.
Restart the thermostat by removing the batteries for at least 3 minutes to refresh.
Try adding it again to the Google Home app.

Please note that you should turn off the power to your HVAC unit at the breaker before touching the wires and let us know how it goes.

Regards,

Mark

Re: cannot connect, wires undetected

Markjosephp — Thu, 05 Jan 2023 19:57:18 GMT

Hello sviscarra,

I'm checking back in. Were you able to do the steps above? I'd be glad to hear from you — we'd like to make sure everything is working.

Thanks,

Mark

Re: cannot connect, wires undetected

sviscarra — Thu, 05 Jan 2023 23:41:36 GMT

no resolve. sorry the late reply. waiting for the nest power connector to arrive. installed and same issue. nothing.

Re: cannot connect, wires undetected

sviscarra — Fri, 06 Jan 2023 03:27:52 GMT

it works! thanks for your help!

Re: cannot connect, wires undetected

EmersonB — Fri, 06 Jan 2023 14:02:19 GMT

Hello folks,

@sviscarra thanks for getting back to us and we're glad that it's resolved now. We can consider this one complete so let us know if you have other questions or concerns as I will be locking this after 24 hours. Feel free to start a new thread and we'll be happy to help.

I appreciate the help, Mark and davidking.

Best,
Emerson