A garage door that won't close is more than annoying — it's a security and weather problem. The good news is that the most common causes are also the easiest to diagnose. Here's a walk-through of what to check, in the order we check it on a service call.
Cause #1: The Safety Sensors Are Misaligned or Blocked
Every modern garage door opener has a pair of photo eye safety sensors mounted near the floor on either side of the door. They shoot a beam of infrared light across the opening. If anything breaks that beam — or if the sensors aren't aimed at each other — the door is designed to refuse to close.
Signs you have a sensor issue:
- The opener's light flashes or blinks when you press close.
- One sensor's LED is off, blinking, or a different color than the other.
- The door starts to close, then reverses immediately.
Check that nothing is in the path (a leaf, a cobweb, a leaning rake), wipe the lenses, and gently nudge the brackets until both LEDs glow steady. About half the "won't close" calls in Mt Juliet end here.
Cause #2: The Close-Limit Setting Is Off
Your opener has a setting that tells it how far down the door should travel to be "closed." If that limit drifts or was set wrong, the opener can think the door has hit the ground before it actually has — or can drive the door into the floor and bounce back up. Most openers have small adjustment screws or buttons that change this setting; check your model's manual.
Cause #3: Something in the Track
Run your eye along the vertical tracks on both sides. A small piece of debris, a stuck pebble, or a misaligned bracket can stop the door cold. Tracks should also be plumb — tilted tracks are a sign of a deeper alignment issue.
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Get a Free QuoteCause #4: Worn or Broken Rollers
Old or damaged rollers can bind in the track and stop the door mid-travel. If your door is noisy and not closing properly, rollers are a strong suspect. Replacing them with quality nylon rollers solves two problems at once.
Cause #5: A Damaged or Bent Track
If a car bumped the track, or the door was forced when something was in the way, you may have a small bend that's enough to stop the door. This is not a DIY fix — tracks need to be straightened or replaced with the right tension considerations.
Cause #6: A Cable or Spring Issue
If a cable has frayed or come off a drum, the door can hang crooked and lose proper travel. If a spring is partially broken, the opener may not have the help it needs to close smoothly. Both are issues that need professional attention — cables and springs store a lot of energy.
What to Do If None of This Helps
You've cleaned the sensors, checked the track, looked for obstructions, and the door still won't close. At that point, you're past the DIY stage. Mt Juliet Garage Door Pros can diagnose the real cause on-site and quote a fix before any work starts. Submit the form on our home page with your zip code and a short description and we'll be in touch.