Why Garage door opener not closing?

If you have a garage door that opens and closes electronically, then check the side of your garage closest to the door for sensors that would be on both sides of the door. If the sun is still out, and shining into the sensors, that may be why. To fix this, stand outside your garage, and arrange your shadow over the sensor, then press the button. Your shadow must be over the sensor until it is finished closing, otherwise it will not work. If this doesn't work, it probably needs to be repaired.