Door Reverses Before Fully Closing
When your garage door starts closing but reverses before reaching the floor, the safety sensors are usually the culprit. The sensors are misaligned, dirty, or blocked. If sensors check out, the close force or limit settings may need adjustment.
Common Symptoms
- Door reverses partway down
- Door reverses different amounts each time
- Opener lights blink after reversal
- Works fine with wall button held down continuously
Possible Causes
- •Safety sensors misaligned
- •Dirty sensor lenses
- •Something blocking sensor beam
- •Sensor wires damaged
- •Close force setting too sensitive
- •Track obstruction creating resistance
How to Fix It
Check sensor indicator lights
Look at both sensors near the floor. Both should have solid lights. If one is blinking, that sensor needs attention.
Clear the sensor path
Remove any objects that might be partially blocking the invisible beam between sensors—even small items or cobwebs.
Clean sensor lenses
Wipe both sensor lenses with a soft cloth. Dust, dirt, and moisture accumulation are common causes.
Realign sensors
Loosen the wing nut on the blinking sensor. Adjust its angle until the light becomes solid, then retighten.
Check sensor wires
Inspect wires for damage. A staple through the wire or rodent chewing can cause intermittent problems.
Adjust close force if needed
If sensors are fine, locate the force adjustment screw on the opener. Turn the down-force screw clockwise slightly.
When to Call a Professional
- •Sensors appear fine but problem persists
- •Wires need replacement inside walls
- •Door has significant track or roller issues
- •Springs seem weak or unbalanced
Frequently Asked Questions
Why does holding the wall button down work?
Holding the button continuously bypasses the safety sensor check—the door will close regardless. This is designed for emergencies but shouldn't be your regular solution.
Can sunlight affect my sensors?
Yes. Direct sunlight can overwhelm the infrared beam. If your problem happens only at certain times of day, install a small shade over the sensor facing the sun.
My sensors are aligned but one light is still dim. Why?
A dim or flickering light usually indicates a wiring problem or a failing sensor. Check wire connections first, then consider replacing the sensor.