December 28, 2025 7 min read
Since 1993, all garage door openers sold in the United States must include safety reversal systems. These motion detection features have prevented countless injuries and saved lives. Understanding how they work helps you maintain them properly and keep your family safe.
How Photo-Eye Sensors Work
The most common safety system uses two photo-eye sensors mounted 4-6 inches from the floor on opposite sides of your garage door. One sensor sends an infrared beam to the other. When the beam is broken by an object, person, or pet, the door immediately stops and reverses direction.
Testing Your Safety Sensors
Test your sensors monthly: place a cardboard box in the door's path and press the close button. The door should reverse immediately upon contacting the box or when the beam is broken. If it doesn't, the system needs adjustment or repair, don't use the door until it's fixed.
Common Sensor Problems
Misalignment is the most frequent issue. Sensors can shift from vibration or accidental bumps. Look for the LED indicator lights, steady lights typically indicate proper alignment. Blinking lights often mean misalignment.
Dirty lenses can also prevent proper operation. Clean both sensors with a soft cloth regularly. Cobwebs are common culprits in garages.
Sunlight interference can affect sensors, especially in the afternoon when direct sun hits the receiving sensor. Installing sun shields or hoods can solve this.
Additional Safety Features
Modern openers include multiple safety mechanisms: The auto-reverse feature uses pressure sensitivity, if the door meets resistance while closing, it reverses. Battery backup systems ensure the door can be opened during power outages. Rolling code technology prevents code grabbing for security.
Upgrading Older Systems
If your garage door opener was installed before 1993, it may lack modern safety features. We strongly recommend upgrading to a current model with photo-eye sensors, auto-reverse, and other safety technologies. The investment is minimal compared to the protection provided.
Teaching Children About Garage Door Safety
Educate children that garage doors are not toys. Keep remotes out of reach of young children. Never let children run under a moving door. Teach them to wait until the door has completely stopped before entering or exiting.
Williams Garage Doors can install, test, and maintain your safety systems. Contact us if your sensors aren't working properly, safety should never wait.