The Smart Radiator Thermostats replace your existing thermostatic radiator valve (TRV) heads. They fit to almost any valve body, either directly or by using one of the included adapters.
To work with your radiator, the Smart Radiator Thermostat needs to determine the positions in which the valve is fully open and fully closed. This process is referred to as calibration.
When calibration fails, the Smart Radiator Thermostat will display an error and will not work correctly. When you want to move the Smart Radiator Thermostat to a different radiator, you need to reset the calibration by restarting the device.