topic Re: Nest replacement in Nest Thermostats

Nest replacement

Ahusted — Tue, 18 Apr 2023 22:56:06 GMT

I am replacing a nest thermostat with a nest learning thermostat and when I attach the new one to the wall it will not power on to finish set up. I have checked that all of the wires are inserted properly and pulled it off and connected it to a USB to make sure the battery is charged. Please advise next steps. Thanks

Re: Nest replacement

CoolingWizard — Wed, 19 Apr 2023 03:01:47 GMT

Just checking, does your cable have Common wire? Also, if you charge the Nest Learning Thermostat for 24-hours you should have enough power to complete the installation process. Can you post a picture of the Nest backplate showing the wires and their connections.

The AC Cooling Wizard

Re: Nest replacement

Ahusted — Fri, 21 Apr 2023 04:57:40 GMT

Thanks so much for replying. I previously had a regular nest thermostat installed, and I installed a google c wire power adapter on the ac unit last year. All was working perfectly. I am trying to upgrade to a google nest learning thermostat and it keeps telling me that there is no power to the c wire.

Re: Nest replacement

Ahusted — Fri, 21 Apr 2023 04:58:09 GMT

Re: Nest replacement

Ahusted — Fri, 21 Apr 2023 05:00:10 GMT

I can’t figure out how to move past this error so that I can see if I need to update the wire settings. Thanks!

Re: Nest replacement

CoolingWizard — Sat, 22 Apr 2023 14:13:09 GMT

Do you have access to a multimeter so you could check power? I would check for AC power between the red wire and the C wire. Since you have a blue conductor being used for your C wire, there’s no need to have a Nest Power Adapter. Make sure that the blue wire at your attic unit is directly connected to the C terminal on the control board.

The AC Cooling Wizard

Re: Nest replacement

Ahusted — Mon, 24 Apr 2023 14:55:33 GMT

Thank you so much for taking the time to reply! We removed the power adapter and hooked up the c wire directly and it worked!!!! I appreciate you taking the time to help me fix this! Thank you, Thank you!

Re: Nest replacement

Markjosephp — Thu, 27 Apr 2023 20:13:27 GMT

Hello folks,

I appreciate your help, @CoolingWizard.

Great troubleshooting, @Ahusted! I'm glad to hear that it's sorted out. I wanted to ensure that everything was covered here. Please let us know if you have any further questions; otherwise, we'll close the thread in 24 hours.

Regards,

Mark