Control Buttons
You can turn on the LED-powered display of the Wired Smart Thermostat X or Wireless Temperature Sensor X by pressing any of the three buttons on the front of the device.
You can manually increase or decrease the temperature by pressing the up and down arrow buttons.
You can switch between viewing the measured temperature and the target temperature by pressing the middle button. The middle button also allows you to restart the device if you press and hold it for ten seconds.
The display has an automated timeout by default and will turn off after a few seconds.
Temperature Values
The temperature on the display represents the measured room temperature if accompanied by a thermometer icon. Otherwise, the temperature represents the target temperature.
The following icons relate to the temperature values shown on the display.
Icon | Meaning |
 | Thermometer Appears next to the current measured temperature. |
 | Off The heating is off and set to frost protection (5°C). |
 | Heat Request 0, 1, 2, or 3 wavy lines indicate the amount of heat being requested. |
Target Temperature Modes
The following icons may appear next to the target temperature. They give more information about how the target temperature was set or how it is being optimised.
Icon | Meaning |
 | Schedule The device is following a Smart Schedule. |
Manual The device is following a command set manually on the device or via the tado° app. | |
 | Away Your tado Home is in Away mode and the device is following the preset Away mode setting. |
 | Energy-saving feature active Either Open Window Detection or Balance is adjusting your usual schedule to reduce unnecessary heating. You can resume your usual schedule at any time in the app. |
Connection Status
The following icons give information about the device’s connection status. These icons appear during the installation process or if the device experiences a connectivity issue.
Icon | Meaning |
Device is discoverable The device is ready to connect. You can scan the QR code or type in the numerical code, either on the device or on its Get started card, to add it to the tado° app (recommended), or any other Matter-compatible smart home app (e.g. Google Home, Apple Home, or Amazon Alexa). | |
Connecting The device is currently connecting to your smart home network (consisting of Thread and Matter). | |
| Connection failed The device was unable to connect. Refer to this article for troubleshooting. |
 | Successfully connected The device has been connected. This icon will disappear after a few seconds. |
| Signal lost The device has lost connection with the Thread border router. Refer to this article for troubleshooting. |
General
Below are the other symbols you might see in your Wired Smart Thermostat X or Wireless Temperature Sensor X display.
Icon | Meaning |
 | Depleted Battery Change the battery as soon as possible. For more information about changing the batteries, refer to this article. |