Check the opening first
Remove obvious objects from the doorway and the area around the tracks. Do not place yourself beneath a moving door while testing it.
Look at the sensors
Dirty, blocked or misaligned photo-eyes can prevent normal closing. See garage door sensor problems.
If the door reverses
The issue may involve sensor alignment, travel settings, force settings or resistance in the door. If the door binds, jerks or sits crooked, stop operating it.
Call for service
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