Hello BIGHOGUES,
Thanks for reaching out to the Google Nest Community Forum. I’m sorry to know that your Nest Thermostat has disconnected from the Google Home app. I appreciate your effort and time in completing a factory reset; however, the trouble persists, and you were unable to complete the setup. Don’t worry; it’s a pleasure to help.
To provide you with accurate troubleshooting steps, please help me by answering the following questions:
- What model of thermostat do you have? To identify the model, refer to this article: How to tell which Nest thermostat you have.
- Did you receive any error messages or notifications when you tried to reconnect your thermostat?
If you have any additional details that might be helpful, feel free to share them with me.
Regards,
Daniel