Why does my door only refuse to close in the afternoon?

Direct Texas sunlight blinding the receiving photo-eye is a common problem. Shielding the sensor with a small cardboard tube or swapping sensor positions solves sunlight glare issues.

Safety Sensors & Electronics4 min read

Why Won't My Garage Door Close? Blinking Light & Sensor Diagnostics

Quick Answer Summary

If your garage door reverses immediately upon closing and the opener light blinks 10 times, the safety sensors (photo-eyes) near the floor are misaligned, obstructed, or disconnected. Align the sending and receiving units until both LEDs glow steady without flickering.

Safe Homeowner Checks

•Wipe dust, spiderwebs, and dirt off the optical lenses at the base of both tracks.
•Check the LED indicators: green indicates receiving beam; amber/yellow indicates power sending unit.
•Tighten wing nuts by hand if brackets shifted after being hit by lawn equipment or car bumpers.
•Verify no toys, broom handles, or sunlight glare directly blind the receiving sensor.

When Professional Help Is Required

•Both sensor LEDs remain unlit despite active electrical power to the overhead opener.
•Sensor wires show visible copper cuts, staple pinches, or rodent chewing along track frames.
•Door binds mechanically midway despite steady, fully aligned safety LEDs.

How Photo-Eye Safety Reversal Works

Federal safety standard <a href="https://www.ul.com/services/door-and-gate-operator-certification-ul-325" target="_blank" rel="noopener noreferrer" class="text-accent underline font-semibold">UL 325</a> and guidelines from the <a href="https://www.dasma.com/" target="_blank" rel="noopener noreferrer" class="text-accent underline font-semibold">Door & Access Systems Manufacturers Association (DASMA)</a> mandate that all residential garage door openers include an active non-contact safety reversal system. Two sensors sit approximately 6 inches above the concrete floor. One emits an invisible infrared beam, and the other receives it. Any interruption forces the motor to immediately stop and reverse back to the open position to prevent entrapment.

Diagnosing Blinking Light Codes

On Chamberlain, LiftMaster, and Craftsman openers, 10 rapid flashes of the main overhead light bulb clearly signal a sensor lockout. On Genie units, a rapidly blinking red light on the powerhead indicates beam obstruction. If sensors are properly aligned but fail to communicate, the internal logic board or low-voltage bell wire is damaged.

Frequently Asked Questions

You can hold down the wall console button continuously until the door reaches the floor. However, you cannot bypass them for remote or smart operation as this eliminates essential entrapment protection.

Relevant Texas Repair Services:

Garage Door Repair Services Garage Door Safety Sensor Alignment & Repair

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If safe homeowner checks indicate broken springs, stripped gears, or off-track door panels, call our Texas dispatch line at (800) 240-4326 for same-day technician matching.

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