Garage Door Won’t Close and Reverses: What to Check First

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Garage Door Won’t Close and Reverses: What to Check First (Safe Steps)

Quick Answer

If your garage door won’t close and reverses, the most common causes are safety sensor issues (alignment, blocked beam, sunlight interference), an obstruction on the floor/track, or the opener detecting resistance and triggering a safety reversal.

Most Likely Causes (Ranked)

  • Most common: Safety sensor beam is blocked or misaligned.
  • Also common: Bright sunlight hitting a sensor (false obstruction).
  • Also common: Something small is in the track or at the floor line.
  • Less common: Door is binding (resistance) and opener reverses for safety.

How to Narrow It Down (Safe Checks Only)

  • Check the sensor lights: If one is off/blinking, alignment or blockage is likely.
  • Wipe the sensor lenses: Dust/spider webs can weaken the beam.
  • Look for sunlight glare: If the issue happens at a certain time of day, sunlight may be the trigger.
  • Scan the floor/track: Small debris can cause a reversal at the bottom.
  • Watch the reversal timing: Reverses instantly vs. near the floor can hint at different causes.

What NOT to Do

  • Don’t bypass or disable safety sensors.
  • Don’t force the door closed with unsafe “workarounds.”
  • Don’t attempt spring or cable adjustments.

When to Stop and Call a Pro

Stop and call a professional if the door feels unusually heavy, binds, slams, or won’t stay in place when partially open. A properly operating door should be balanced, and unbalanced doors can be dangerous. For safety guidance on reversing systems and testing, see the CPSC consumer safety notice. CPSC garage door safety publication (PDF)

Prevention Tips

  • Keep sensor lenses clean and clear.
  • Keep the floor line free of small debris.
  • Test safety reversal periodically (follow manufacturer guidance and safety standards).

Helpful Links

FAQs

  • Can I still use the opener if it keeps reversing? If it’s reversing unpredictably or you suspect a safety issue, stop using it and call a pro.
  • Does sunlight really cause reversing? Yes — sunlight can interfere with photoelectric sensors and create false obstruction signals.
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