Cannot get beyond m15 error when adding second Nest Thermostat to Network

[BrentR]

The first Nest Learning thermostat set up without problems. However the second one consistently fails with the “cannot be added to my account error. “

The suggested fix of resetting the device simply leads to repeated m15 errors each time I try to set it up again. How can I get past this?

[Jake]

Hey BrentR,

Apologies for the late response. I wanted to follow up and ensure you are good to go. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

[Jake]

Hey BrentR,

I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity. 

Best regards,
Jake

[BrentR · Accepted solution]

Hi Jake, 
    Thanks for following up. After 4 unsuccessful attempts to setup the second thermostat, I eventually deleted the first thermostat from my account and took it offline. Then, with the second thermostat offline (so it couldn't automatically setup my WiFi), the second thermostat successfully completed setup without WiFi.

    Then, with the thermostat setup complete, except for WiFi, I manually entered the WiFi SSID and password. The second thermostat went online, downloaded and installed a firmware update. After it rebooted and seemed to be operational, I then reconnected the first thermostat and powered it up. After all that, both are working correctly and both appearing on my account.

[Jake]

Hey BrentR,

Glad to hear you were able to get the devices up and running. Thanks as well for provided the steps you took to get those up and running as well. I have marked your solution in case others have the same issue. I will be locking the thread at this time with the issue being resolved. Please feel free to create a new post at any time if you have any questions from here.

Best regards,

Jake