Reset your thermostat. The steps to reset your Honeywell smart thermostat vary by model. Keep in mind that doing a factory reset will erase all of your settings, including your Wi-Fi connection.

If your thermostat has a Menu option or button, such as the Smart WiFi T5, T6, T9, or T10, the option to reset it is in that menu. The menu names are a little different on all Honeywell models, but you'll usually find a Reset or Factory Reset option in a menu called Advanced Setup, Preferences, or Thermostat Information.

On the VisionPRO TH8321WF, which has a Menu button, select Dealer Information on the menu, scroll down and write down the date code, then press Done. Then, select Installer Options, enter the date code, and select Reset.

If you have a Honeywell FocusPro 6000, press and hold Arrow Up and Fan. Change the number on the left to 90, and the one on the right to 1. Select Done to reset.

On the VisionPRO 8000, press System, press and hold the blank box in the center, change the number on the left to 0710, and the one on the right to 1. Select Done to reset.

For the Smart/Lyric Round, press and hold the cloud icon, then select Reset.