My Smart Radiator Thermostat displays E1, E2 or E4. What does it mean and how can it be solved?

The errors E1, E2 and E4 indicate an issue during the calibration of the Smart Radiator Thermostat. As soon as the device is attached to the mounting bracket it attempts to determine the positions in which the valve is fully open and fully closed. This is referred to as calibration.

If calibration fails the Smart Radiator Thermostat will indicate the issue by one of the following errors:

Error E1 indicates that the closed position of the valve has not been detected. Unmount the Smart Radiator Thermostat and make sure the mounting bracket is properly tightened to the valve body. Note: If you are using the largest of the supplied adapters (Danfoss RAV), you might need to use the separate pin extender.

Error E2 is displayed when no contact of the motor with the valve pin has been detected. Please make sure that the mounting bracket and the adapter (if used) are attached properly to the radiator and remount the Smart Radiator Thermostat to restart the calibration.

Error E4 means that only a very short travelling distance between the open and closed position of the valve has been detected. This often indicates that the radiator valve is blocked by calcification. Unmount the Smart Radiator Thermostat and unblock the valve by moving the pin in and out using a wrench or other tool before remounting the Smart Radiator Thermostat to restart the calibration.

If the calibration is not successful after several attempts, please contact our Technical Support Team for assistance and add a clear picture of the thermostatic valve body.