Since 1993, every garage door opener sold in the US must include photo-eye safety sensors. They prevent the door from closing on children, pets, and cars — and they're also the number-one cause of "my door won't close" service calls.
How They Work
Two small sensors sit about six inches off the floor on either side of the door opening. One sends an invisible infrared beam; the other receives it. If anything breaks the beam while the door is closing, the door reverses immediately.
The Most Common Failures
- Misalignment. A bump from a trash can or bike knocks a sensor out of line. Most sensors have indicator lights — a blinking or dark light means the beam isn't connecting. Gently bend the bracket until the light glows steady.
- Dirty lenses. Dust, cobwebs, and lawn clippings block the beam. Wipe both lenses with a soft cloth.
- Sunlight interference. Low afternoon sun can overpower the receiver. Shielding the sensor with a small cardboard tube often solves it.
- Damaged wiring. Staples, pinched wires, and chewing pests break the circuit. This one usually needs professional repair.
Sensor still acting up? Straight Up Garage Doors troubleshoots openers across the St. Louis metro, usually in a single visit. Call (314) 788-1106.