Sensors in the SimpliSafe system will issue errors when they fail to check in with the Base Station for more than 24 hours. This issue is generally caused by one of the following:

• The battery or batteries in the device issuing the error need to be replaced.

• The device is too far away from your Base Station and is unable to communicate from its current location.

Please refer to the life expectancy of batteries with our latest SimpliSafe system and its components if you believe that your battery or batteries may need replacing.

The easiest way to determine whether or not your sensor is too far from your Base Station is to test it. Put the Base Station into Test Mode by following these instructions:

1. Press “menu” on the Keypad, and enter your Master PIN.

2. Navigate to “Test Mode” and press the right rocker to select it.

3. The Base Station will announce that it is entering Test Mode.

4. Press the button on top of the sensor you wish to test.

5. If the Base Station is able to communicate with the sensor, you’ll hear the Base Station acknowledge the test by announcing the sensor.

If you did not hear the Base Station acknowledge the test (but you were in earshot range and would have if it had done so), detach the sensor from its mounting bracket and bring it into the room where your Base Station is positioned. Repeat the test by pressing the test button on top of the sensor. This time, if you hear the test acknowledged, you’ll know that the sensor is too far from the Base Station for it to be able to communicate reliably.

Generally, we advise that you relocate the Base Station rather than the device itself when this happens, as the Base Station should be able to communicate with all of your devices if it is located in a central part of your property. That being said, some areas may be subject to higher levels of interference - such as the kitchen, office where many electronics are plugged in, etc. If you are able to do so, try relocating the Base Station to be closer to these areas if you find yourself experiencing issues with sensors not responding, as it will often resolve the problem.