If you need to do a Factory Reset while installing your Smart Thermostat X or Wired Smart Thermostat X for the first time, please follow these steps:
Press and hold all three buttons for 6 seconds until FR appears on the screen. Then release the buttons.
Press and hold the middle button for 6 seconds to confirm, then release the button.
The screen will blink FR during the reset, then show Hi! as it starts up.
Three bars will blink on the screen when your device is ready to be reinstalled.
Go to Settings > Rooms & Devices and select Add device in the tado° app.
Scan the device QR code to reinstall your device.