Garage Door Won't Close? 8 Causes and Exact Fixes

You hit the close button, the door starts down, and bam — it reverses right before reaching the floor. Or it just won't close at all. This is one of the most common calls we get, and most of the time, it's actually a SAFETY system catching a real problem. Federal UL 325 safety standard requires the door to reverse if the photo-eye beam is broken or if force on the door exceeds the calibrated threshold. Here's how to diagnose:

1. Photo-Eye Sensors Misaligned (Most Common Cause)

The two photo-eye sensors near the floor have to be aligned within a tight tolerance. A bumped sensor, a leaf in the path, a spider web, or even strong sunlight can cause the door to refuse to close.

Fix: Look at the sensors. The receiver side has an LED that should be solid. If it's flickering or off:

• Wipe both lenses with a soft cloth (dust and debris)
• Check that the brackets are tight; gently nudge the misaligned sensor until the LED is solid green
• Make sure no objects are in the beam path
• If sun is hitting the lens, shade with a small hood

If LED still won't go solid: The sensor or wiring may be bad. Photo-eye replacement is $129-$189.

2. Photo-Eye Beam Path Obstructed

Even a small object — a pile of leaves, a child's toy, a tool left out — breaks the beam. Walk along the door path and check for anything in the way.

3. Close-Force Setting Too Low

The opener has a force-limit setting that determines how much resistance triggers a reverse. If it's set too low, the door reverses on its own seal, weather-stripping, or even minor track friction.

Fix: Most modern openers have a force-limit dial. Increase by one click and test. If you have to crank it way up to get the door to close, something else is wrong (drag, dry tracks, off-track roller). DON'T just max out the force — that defeats the safety system.

4. Track Obstruction or Dragging

A bent track section, a cracked roller, or a misaligned hinge causes the door to drag during closing. The opener interprets the resistance as an obstacle and reverses.

Fix: Watch the door close. Note where it reverses. Inspect that section for damage. Lubricate tracks with white lithium grease (not WD-40).

5. Bottom Seal Frozen to Concrete (Winter Issue)

In NYC winters, snowmelt refreezes overnight and bonds the rubber bottom seal to the concrete. When you try to close (after opening earlier in the day), the seal sticks and the opener interprets the stuck door as obstruction.

Fix: Pour warm water along the seal to break the bond. Long-term: replace the bottom seal with a fresh EPDM seal ($129-$189) and treat with silicone-based release lubricant.

6. Limit Switches Out of Adjustment

The opener has down-limit switches that tell it where the floor is. If they're set too high, the door tries to close past the actual floor and reverses on contact.

Fix: Most openers have limit-switch adjustment screws (read your manual). Adjust the down-limit so the door just touches the floor. If the door bounces or compresses the seal too much, the limit is set too low.

7. Manual Lock Engaged

The slide bolt at the side of the door, if engaged, prevents the door from closing all the way. People bump it accidentally.

Fix: Walk around the inside of the garage and check that no manual lock is engaged.

8. Opener Logic Board Failing

If you've ruled out everything above and the door still won't close, the opener's logic board may be failing intermittently. This is harder to DIY-diagnose. We use a multimeter to read voltages on the board terminals.

Fix: Logic board replacement runs $150-$280 depending on opener brand. If the unit is 12+ years old, full opener replacement at $399-$680 is usually the better value.

What NOT to Do

Do NOT bypass the photo eyes or disable the safety reverse. UL 325 makes that illegal, and there's a real reason: doors falling on children and pets killed multiple people in the 1980s, which is why the standard exists.

Still Won't Close? Call Us.

If you've tried the DIY steps and it's still not working, call (929) 429-2429. We diagnose in 10 minutes on-site. Mention promo code SAVE50 for $50 off any repair over $250.

Need a Pro?

OnPoint Pro Doors handles same-day garage door repair across NYC, Long Island, and New Jersey. Up-front pricing. Licensed & insured. ★ 4.9 / 5 (287+ reviews).

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