The flashing trouble light on your Notifier FCO-951-IV could indicate several potential issues. First, ensure all wiring connections are secure and that there are no loose or damaged wires. Additionally, check for any obstructions in the system that may be triggering the trouble signal. If these steps don’t resolve the issue, try power cycling the panel by turning it off and then back on again. If the trouble light persists, it may indicate a more complex issue requiring professional inspection. Feel free to reach out to our technical support team for further assistance.