Comfort Wi-Fi | What does the E2 error mean on the Comfort Wi-Fi thermostat display?
Error E2 indicates a floor temperature sensor failure. Check if the floor temperature sensor is correctly connected to the thermostat. If the floor temperature sensor is connected to the thermostat correctly and error E2 is still displayed, then the sensor must be disconnected from the thermostat and the resistance of the sensor measured. The sensor resistance at different temperatures are shown in the table.