Sure! First, ensure that the wiring connections are correct and secure. Sometimes loose connections can cause the LED indicator not to function. Secondly, double-check the power supply to the detector. If the power supply is insufficient or unstable, it could affect the LED indicator’s operation. Lastly, make sure the detector is properly programmed and calibrated according to the manufacturer’s instructions. If you’ve tried these steps and the issue persists, it might be a defective unit, and you may need to contact System Sensor for further assistance or a replacement.