Check your safety sensors
The safety eyes (commonly referred to as safety sensors) are obstructed. The garage door opener safety eyes are small usually black in color rectangular boxes that attach to both the left and right track. Pursuant to code, these safety eyes should be installed approximately 6 inches from the floor so look towards the bottom of the track. These safety eyes create an invisible beam that must be continuous in order for the door to function correctly. When the beam is broken or blocked the door will not close using the garage door opener.