How to Resolve the ER2 Message on the Terra Smart WiFi Thermostat?

Terra WiFi Thermostat

When the thermostat reads “ER2,” the floor sensor has a short circuit or has a loose connection. Your electrician must secure connections and test the probe using a multimeter set to the lowest possible ohms scale. The resistance reading should be between 7 and 17 ohms. If a short is found and a backup sensor probe was not installed, you can bypass the error message by setting the thermostat to read the air temperature instead.

If you would like to resolve the ER2 Message on the Terra Smart WiFi Thermostat, view the instructions below or watch the video included.

Press accept to continue
Use the arrows to move to the settings icon and press accept
Use the arrows to move to the thermostat application icon and press accept.

1 means Floor Sensor and 2 means Air Sensor

The thermometer icon represents the “control” sensor. The shield icon represents the “limit” sensor. If shown on your thermostat in this order, the control sensor is set to floor and the limit sensor is set to air. If reversed, the control sensor is set to air and the limit sensor is set to floor.