1. Reset the mirror by unplugging the power cable and plugging it back in.

2. Test the sensor:
    a. Clean the sensor lens using soft cloth.
    b. Place your hand 4-6 inches in front of the sensor to activate the mirror light.

First try this:
1. Clean the sensor with rubbing alcohol and a mircofiber cloth.
2. Make sure there is nothing interfering with the sensor.

If that doesn't work, reset your unit by unplugging and plugging back in the power cable.

This might happen after user tries to flip the mirror manually or object is in the way while mirror is auto-flipping. The mirror auto-protects the gear. To reset, simply double tap the touch control bar. You should be able to hear a click sound or see the mirror moves slightly, double tap on the touch control again for another 2 - 3 times and mirror should be able to flip normally.