Garage Door Won't Close? Here Are the Most Common Causes

A garage door that refuses to close leaves your car, tools, and home exposed. Before you panic or call a technician, it helps to know what you're dealing with. Most problems fall into a short list of common causes — and some of them take less than five minutes to fix yourself.

Work through this list in order. The causes are ranked from most to least likely, so you'll find your answer faster by starting at the top.

1. Blocked or Misaligned Photo-Eye Sensors

This is the number one reason a garage door won't close. Since 1993, federal law has required all garage door openers to include photo-eye safety sensors. These two small devices sit about 4–6 inches off the ground on either side of the door. They shoot an invisible beam across the opening. If anything breaks that beam — or if the sensors are out of alignment — the door won't close.

How to Diagnose It

• Look at both sensors. Each one should have a steady light. A blinking or dim light means something is wrong.
• Check for dirt, spider webs, or moisture on the sensor lenses. Wipe them clean with a dry cloth.
• Make sure both sensors point directly at each other. Even a slight bump can knock them out of alignment.

DIY or Pro?

Almost always DIY. Loosen the wing nut on the misaligned sensor, adjust it until the light turns solid, then retighten. This costs $0. If a sensor is physically broken and needs replacement, a new sensor costs $15–$30 at a hardware store. A technician will charge $75–$150 for a sensor replacement including labor.

2. Something Is Blocking the Door's Path

The safety system is doing its job. Before assuming something is broken, do a quick visual scan of the entire door opening from floor to ceiling.

How to Diagnose It

• Look for trash cans, bikes, boxes, or anything else sitting in the door's path.
• Check the floor for small objects like a garden hose or a piece of wood that could trigger the sensors.
• In winter, look for ice buildup along the bottom of the door frame.

DIY or Pro?

Always DIY. Move the object and try again. Cost: $0.

3. Close-Limit Switch Needs Adjusting

Your opener has a close-limit switch that tells the motor how far down the door needs to travel before stopping. If this setting is off, the opener may think the door has hit an obstruction and reverse before it reaches the ground.

How to Diagnose It

• Watch the door as it closes. Does it go partway down and then reverse back up on its own?
• Does the door close fully but then immediately reverse?
• If yes to either, the close-limit switch is a likely culprit.

DIY or Pro?

This is a moderate DIY task. Most openers have a limit adjustment screw on the back or side of the motor unit — your owner's manual will show you exactly where. Turn the screw in small increments and test the door after each adjustment. If you're not comfortable doing this, a technician can handle it for $75–$100.

4. Broken Springs or Cables

Torsion springs and lift cables do the heavy work of raising and lowering your door. A broken spring or frayed cable can prevent the door from closing — or make it dangerous to operate at all.

How to Diagnose It

• Look at the large spring(s) above the door. A broken torsion spring will have a visible gap in the coil.
• Check the cables running along the sides of the door. Fraying, kinking, or a cable hanging loose means it's failed.
• If the door feels extremely heavy when you try to close it manually, a spring is likely broken.

DIY or Pro?

Call a professional. Torsion springs are under extreme tension and can cause serious injury if handled incorrectly. Spring replacement typically costs $150–$350 depending on the spring type and your location. Cable replacement runs $100–$200. Don't skip this repair — operating a door with a broken spring can damage the opener and the door itself.

5. Track Obstruction or Misalignment

The metal tracks that guide your door up and down can get dented, bent, or pulled out of alignment over time. Even a small gap between the rollers and the track can stop the door mid-travel.

How to Diagnose It

• Inspect both vertical tracks for dents, bends, or debris like pebbles or hardened grease.
• Look for gaps between the rollers and the track as the door moves.
• Check that the tracks are plumb (straight up and down) using a level.

DIY or Pro?

Minor debris removal is DIY. Use a damp cloth to clean the tracks and a rubber mallet to gently tap out small dents. For significant bending or misalignment, hire a pro. Track repair typically costs $125–$250. Full track replacement runs $200–$400.

6. Logic Board Failure

The logic board is the brain of your garage door opener. Power surges, age, and moisture can cause it to fail. This is less common but worth checking if everything else looks fine.

How to Diagnose It

• The opener makes no sound and shows no lights when you press the button.
• The opener behaves erratically — closing sometimes but not others with no clear pattern.
• You've already ruled out all of the causes above.

DIY or Pro?

Replacing a logic board is a moderate DIY job if you're comfortable with basic electrical work. Replacement boards cost $40–$100 depending on your opener brand. Professional replacement runs $150–$300 with labor. If your opener is more than 10–15 years old, it may be more cost-effective to replace the entire unit ($300–$600 installed).

7. Remote or Wall Button Issues

Sometimes the problem isn't the door at all — it's the device you're using to control it.

How to Diagnose It

• Try using the wall button instead of the remote. If the wall button works, the issue is with your remote.
• Replace the remote's battery. Dead batteries are a surprisingly common culprit.
• If neither the remote nor the wall button works, check that the opener is plugged in and the circuit breaker hasn't tripped.
• Try reprogramming the remote according to your owner's manual.

DIY or Pro?

Almost always DIY. A new battery costs under $5. A replacement remote runs $20–$50. A new wall button costs $15–$30. If wiring to the wall button is damaged, a technician can repair it for $75–$150.

When to Stop Troubleshooting and Call a Pro

If you've worked through this entire list and still can't identify the problem, it's time to call a licensed garage door technician. You should also call immediately — without troubleshooting — if you see a broken spring, a snapped cable, or a severely bent track. These are safety hazards that get worse the longer they go unaddressed.

A standard service call typically costs $75–$150 just for the visit, with repairs billed on top. Getting a second quote is always a smart move for repairs over $200.