Can’t add thermostat to account

[Dpipal]

I moved into a house with a nest thermostat. I set up Wi-Fi but I can’t connect. Error code m15. Won’t allow me to do anything. Just goes back and forth from m15 to learn more.

[David_K · Accepted solution]

Have you tried these steps?

Troubleshoot an M15 error on a Nest thermostat - Google Nest Help