If your Temperature Sensor is showing as offline on the SimpliSafe® Mobile App, this is an indicator that the battery within the device needs to be replaced.

The Temperature Sensor takes a single (1) CR-2032 Lithium 3V battery and has a life expectancy of up to 5 years depending on placement and usage.

To replace the battery, slide the sensor up and off its’ bracket. Then, replace the lithium battery and slide the sensor back onto its’ bracket.

Please note that the error may take up to 24 hours to clear from the SimpliSafe® Mobile App after taking these steps. If you want to bypass that timeframe, there are two steps you can take to remove the error from the SimpliSafe® App.

First, place your system into Test Mode and test the sensor to reestablish a connection.

To place your system into Test Mode:

1. Using your Keypad go to Menu > Enter your Primary PIN > Test Mode

2. Press and release the button on the Temperature Sensor. The Base Station should announce “Freeze Sensor” and the timeline on the SimpliSafe® App should show “Freeze Sensor Test”.

If the Test Mode step does not work, it’s possible that your sensor has been offline for too long. The best step would be to remove the sensor from the SimpliSafe® App and then add it back to your system.

To remove your Temperature Sensor:

1. Open the SimpliSafe® mobile app on your phone or tablet

2. Choose My System from the bottom navigation bar

3. Select Device Settings

4. Tap on the sensor you wish to remove

5. Choose ‘Remove Device’

Once you have removed your sensor, you can add it back using our Installation Guide.