Automatic Reversal and Garage-Door Opener Safety Basics

Follow the opener manufacturer’s current instructions; CPSC has historically urged monthly testing.

Do not increase force to overcome a mechanical problem. Have the door and opener diagnosed.

It is the opener's requirement to reverse a closing door when it meets resistance or when the photo-eye beam is broken, so the door cannot crush a person, pet or object. There are two mechanisms: the photo eyes (a contactless beam) and contact reversal (the door reverses when it physically meets an obstruction). Both are required and both are tested.

UL 325 is the safety standard covering garage-door operators, including the entrapment-protection requirements that manufacturers build to. Its practical effect for a homeowner is that any compliant modern opener must have a working reversal system. This page is orientation, not a compliance ruling — what applies to your specific installation is a matter for a qualified provider.

Lay a solid object — a length of timber works — flat on the floor in the door's path and close the door. When the bottom of the door meets it, the door should reverse. If it does not, stop using the automatic close and request service; a door that does not reverse on contact is a genuine hazard, not a minor fault.

The photo eyes reverse the door before it touches anything, by sensing a break in a beam near the floor. Contact reversal reverses the door when it physically meets resistance. They are two layers of the same protection — the beam catches things in the opening, contact reversal catches what the beam misses — and both should work.

Photo-eye faults (misalignment, dirt, damaged wiring) disable the beam layer; incorrect force or travel settings can stop contact reversal working correctly; and wear or damage can change how the door meets resistance. Because these are safety functions, they are diagnosed and corrected properly rather than adjusted by feel.

Turning the force up to overpower resistance is exactly the wrong move — the force setting is what lets the opener detect an obstruction and reverse, so raising it to force a binding door closed removes that protection. The door's mechanical resistance is fixed, not the force setting turned up to beat it.

The common guidance is monthly for both the photo-eye and the contact-reversal test — they take a minute between them and they are the checks that confirm the door is still safe. A professional maintenance visit tests them too, but a monthly homeowner check catches a fault between visits.

Openers made since 1993 are required to have photo-eye entrapment protection; older units may have only contact reversal or, on very old ones, neither. A unit that lacks the beam layer is a strong candidate for replacement, because no adjustment adds a safety feature the hardware never had.

Stop using the automatic close, keep children and pets away from the door, and request service. A door that closes but will not reverse on an obstruction is the specific failure the whole safety system exists to prevent, so it is treated as a safety repair rather than a convenience issue.

A door that reverses on nothing is usually reporting a real resistance — a binding track, a tight roller, an unbalanced door — or a photo-eye issue, rather than being over-sensitive. The fix is to find and correct what it is reacting to, not to reduce the sensitivity, which would blunt the protection.