1. **Visual Inspection**: Check for physical damage, loose connections, or burnt-out bulbs. Ensure the unit is securely mounted and not obstructed.
2. **Power Supply Check**: Verify that the unit is receiving power. Check the circuit breaker and ensure the switch is on. Confirm that the AC power indicator light is illuminated.
3. **Battery Inspection**: Test the battery by pressing the test button. If the lights do not illuminate, the battery may be dead or disconnected. Replace or reconnect the battery as needed.
4. **Bulb Replacement**: If the bulbs are not lighting up during the test, replace them with the correct type specified by the manufacturer.
5. **Wiring Examination**: Inspect the wiring for any signs of wear, corrosion, or disconnection. Ensure all connections are secure and that there are no exposed wires.
6. **Test Button Functionality**: Press the test button to simulate a power outage. If the lights do not activate, there may be an issue with the internal circuitry or battery.
7. **Battery Charging**: Ensure the battery is charging properly. If the battery does not hold a charge, it may need replacement.
8. **Circuit Board Check**: Inspect the circuit board for any signs of damage or burnt components. Replace the board if necessary.
9. **Manufacturer’s Manual**: Consult the manufacturer’s manual for specific troubleshooting steps and ensure all components are compatible and correctly installed.
10. **Professional Assistance**: If the issue persists, contact a professional electrician or the manufacturer for further diagnosis and repair.