Auto-Reverse Sensors: Protecting Your Family
December 28, 2025
Since 1993, federal law has required all garage door openers to include auto-reverse safety features. These systems have prevented countless injuries and saved lives. Understanding how they work and maintaining them properly is essential for every homeowner with an automatic garage door.
How Auto-Reverse Systems Work
Modern garage door openers use two complementary safety systems:
Photo-Eye Sensors
Mounted 4-6 inches above the floor on either side of the door, these sensors create an invisible infrared beam across the door opening. When the beam is broken while the door is closing, the door immediately stops and reverses direction.
The sending unit (usually with an amber light) transmits the beam to the receiving unit (usually with a green light). Both units must be properly aligned and unobstructed for the system to function.
Mechanical Auto-Reverse
This system detects resistance when the door contacts an object during closing. Pressure sensors in the opener measure the force required to move the door. If resistance exceeds a preset threshold, the door stops and reverses.
This feature is adjustable and should be set so the door reverses when contacting a 2-inch board laid flat on the floor.the industry standard test.
Why These Systems Matter
The statistics are sobering. Before mandatory safety requirements: - Approximately 60 children died annually from garage door accidents, Hundreds more suffered serious injuries, Adults and pets were also at risk
Since the 1993 mandate, fatalities have dropped dramatically. But the systems only work if properly maintained.
Monthly Safety Testing
The Consumer Product Safety Commission recommends monthly testing of both safety systems:
Testing Photo-Eye Sensors
1. Open the garage door completely 2. Place a cardboard box or similar object in the door's path 3. Press the close button 4. The door should reverse immediately upon the object breaking the beam 5. If the door doesn't reverse, do not use the opener until repaired
Testing Mechanical Reverse
1. Open the garage door completely 2. Place a 2x4 board flat on the floor in the center of the door opening 3. Press the close button 4. The door should reverse within 2 seconds of contacting the board 5. If it doesn't, adjust the close force or call for service
Common Sensor Problems and Solutions
Misaligned Sensors
Symptoms: One or both sensor lights blinking, door won't close, or reverses without obstruction.
Solution: Loosen the mounting brackets and adjust until both sensors show steady lights. Tighten and retest.
Dirty Lenses
Symptoms: Intermittent operation, especially in dusty conditions.
Solution: Clean both lenses with a soft, dry cloth. Avoid harsh chemicals that could damage the plastic.
Damaged Wiring
Symptoms: Sensors don't light up, intermittent operation.
Solution: Inspect wiring from sensors to opener. Look for cuts, crimps, or corrosion. Replace damaged wiring.
Sun Interference
Symptoms: Door won't close during certain times of day.
Solution: Install sensor shades or relocate sensors slightly. Some newer sensors have sun-filtering features.
When to Call a Professional
Contact us immediately if: - Either safety system fails testing, Sensors won't align despite adjustment, You notice exposed or damaged wiring, The door makes unusual movements, Any component appears damaged
Never bypass or disable safety features. While it may seem like a quick fix for a malfunctioning door, the consequences can be tragic.
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. Today's openers offer: - Dual safety systems (photo-eye and mechanical) - Battery backup for operation during power outages, Smartphone monitoring and control, Enhanced security features
At Myrtle Point Garage Doors, we install all major opener brands and can recommend the best option for your needs. Our repair technicians also service existing safety systems. We provide service throughout Broadbent, Arago, Fairview, and all our service areas. Call (541) 422-3658 for a free consultation or contact us online. Check our opener troubleshooting guide for DIY tips. Your family's safety is worth it.