Why Your Garage Door Won't Close and How to Fix It

Garage doors fail in predictable ways, and a door that won't close sits somewhere between annoyance and security problem. Before you call a technician, understand that most closure failures come from one of three sources: the safety sensors are blocked or misaligned, something is obstructing the track, or the springs have lost tension. The good news is that diagnosing which one it is takes minutes, and fixing the easy ones takes less than an hour. The hard part—replacing a broken torsion spring—is genuinely dangerous work that belongs in a professional's hands. This guide walks you through the diagnosis and shows you what you can safely fix yourself.

1. Wipe the Sensor Lenses Clean. Look at both sensor eyes on either side of the garage door opening, about 6 inches up from the ground. Each sensor has a small lens. Wipe both lenses clean with a dry cloth—dust and spider webs block the infrared beam. Then look directly into each lens to confirm it's clear. If you see dirt or cloudiness, wipe it again. Now try closing the door. If it closes, you're done.
2. Point Sensors at Each Other. Look at both sensor heads. They should both be pointing straight across at each other at the same height. If one is angled upward, downward, or to the side, it can't see the other. Loosen the sensor mounting bracket slightly (usually one bolt) and rotate the sensor until it points directly at the other one. The lenses should face each other in a straight line. Tighten the bolt. Test the door.
3. Clear Track Debris. Walk the full length of both the upper and lower tracks on both sides of the door. Look for debris, dents, bent metal, or anything blocking the path. Remove any debris by hand or with a brush. If you find a dent or bent section in the track, the door will stop when it hits that point—this requires a technician, as track replacement is beyond DIY scope.
4. Clear the Door's Path. Stand in the garage and look at the ground directly in front of the closed door. Check for tools, boxes, bikes, or anything else that might trigger the sensors. Move everything at least 3 feet away from the door opening. Also check above the door inside the garage to make sure nothing is hanging in the way. Now try closing the door again.
5. Test Sensor Communication. With the door open, press the close button and immediately pass your hand slowly through the beam between the two sensors, about 12 inches above the ground. The door should stop and reverse. If it doesn't, the sensors are not communicating. Check the wiring at the back of each sensor—both should have a cord running to the opener. If a wire is unplugged or disconnected, plug it back in firmly.
6. Check Sensor Wires. Follow the wire from each sensor back toward the garage door opener. Look for pinched, cut, or severely kinked sections. If a wire is damaged, it won't transmit power and the sensor won't work. Minor kinks can be straightened by hand. Major cuts or severed sections mean the sensor needs a new wire—this is doable but requires running new wire from the opener to the sensor, which is a moderate DIY job if you're comfortable with basic wiring.
7. Adjust Close Force. Locate the force adjustment dial on the side of the garage door opener motor. It usually has two dials—one for open force and one for close force. The close-force dial may have been turned down too low, causing the door to stop before it fully closes. Turn the close-force dial one-quarter turn clockwise and try closing the door again. If it still won't close, turn it another quarter turn and test again. Do not turn it more than one full turn from the starting position.
8. Test Door Balance. Unplug the garage door opener. Use the manual release handle inside the garage to disengage the trolley from the motor (pull the rope or lever). Now slowly open the door by hand to about halfway. The door should stay roughly in place without creeping open or slamming shut. If it drifts down or springs open, the springs are out of balance. Do not adjust torsion springs yourself—this is the one repair that genuinely requires a technician, as the springs are under extreme tension and can cause serious injury.
9. Listen for Spring Failure. Plug the opener back in and re-engage the trolley (push it forward until it clicks). Press the close button and listen carefully to the sound of the door closing. Grinding sounds mean metal-to-metal contact, usually in the track. Clicking or rattling means loose hardware. A loud bang or crack followed by the door stopping partway means a spring has broken. If you hear a spring break, do not attempt to operate the door further—a broken spring is a job for a professional.
10. Check Rollers and Brackets. Look at the rollers along both sides of the door, especially at the top and bottom corners. The rollers should sit inside the track and spin freely. If a roller is cracked, flat-spotted, or sitting outside the track, it needs replacement. Check the brackets that hold the rollers—they should be tight and not bent. Tighten any loose bolts with a wrench, but do not attempt to remove or replace rollers or brackets; this requires disconnecting springs and is dangerous.
11. Clean Upper Track. Use a broom or small brush to sweep out the upper track along the entire length of the door. Debris collects here more than anywhere else. Pay special attention to the corners and the section directly above the door when it's closed. Sometimes leaves or dirt compress over time and create an obstruction that's not immediately visible. Sweep it all out.
12. Confirm Door Closes Fully. Close the garage door fully. Listen, watch, and feel for any hesitation or resistance. The door should move smoothly and close without stopping. If it closes cleanly, record which steps fixed it so you know what to check if it happens again. If it still won't close, and you've ruled out all the above, you're at the point where a technician is needed—likely for spring replacement or opener repair.