Hello Hannah! Sorry to hear of issues with your Simplex 8688-164.Let’s start by checking the power supply to the Simplex 8688-164. Ensure it’s receiving the correct voltage and that there are no issues with the power source. If the power supply checks out, inspect the wiring connections to the device. Make sure all connections are secure. Additionally, review the device’s manual for any specific troubleshooting steps. If the problem persists, share more details, and we’ll assist you further!