If your garage door sensors are outside of this range remove them entirely from the garage door frame and install leveled inside the safe zone.
How to fix garage door sensor alignment.
Since the sensors are often placed 6 above the ground all sorts of items could get in the way.
This is a brief demonstration on how to adjust the safety sensors on your garage door.
Lower is easy to stand above with a foot on either side.
Higher than that can miss many low lying objects including pets.
Garage door sensors must be aligned to ensure your garage door opens and closes properly.
In other words something is probably blocking the beam.
Proper height for a garage door sensor is 4 to 6 inches 10 2 to 15 2 cm.