Sure, let’s start with some basic troubleshooting steps for your Notifier FST-951H-IV. First, check if the power supply to the system is stable and if all connections are secure. Then, inspect the device itself for any visible damage or loose components. If everything looks fine externally, try resetting the system by powering it off and then back on again. If the issue persists, consult the user manual for specific troubleshooting instructions or reach out to a certified technician for further assistance. Remember, safety should always be a priority when dealing with fire alarm systems.