When the door refuses to lift or lower completely, the culprit might again be the safety sensors. If the sensors are operating properly – looking again to see if the lights shine red and green and are facing each other and aligned – a likely cause is one of the limit switches.
The exact placement and appearance of the limit switch depends on the specific garage door opener. Typically, you can find limit switches on the back of the garage door opener unit, the box attached to the door track overhead. Use a stepladder to reach the switches, small plastic screws marked up and down, and turn to adjust. On some brands, the switches are instead mounted on the rail extending between the door and opener unit. Loosen the switch and move either closer to or farther from the unit, then tighten with a screwdriver. Test the garage door opener after adjustment of either to see if this solves the problem.
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