Garage Door Won’t Close? Safety Sensors, Reversing Doors, and Other Common Causes
A garage door that won’t open is an inconvenience. A garage door that won’t close is a different kind of problem, because it leaves your garage, and often your house, open to the street. Maybe the door starts down and pops right back up. Maybe the opener lights flash and nothing happens. Or the door stops a foot from the floor and sits there. The good news is that many of these problems have simple causes you can check yourself in a few minutes. This guide covers the most common reasons a garage door won’t close, what to check safely, and when it’s time to call for garage door repair in Boise and the Treasure Valley. If your door is stuck closed instead, read our guide to why a garage door won’t open.
Stop and call a pro if: the door is crooked or hanging off its track, a cable looks frayed or loose, you heard a loud bang, or the door drops or jerks as it moves. Keep people, pets, and vehicles out from under the door, and don’t try to force it down by hand. Call or text 208-830-7413, or see our emergency garage door service.
Quick Guide: Match the Symptom to the Likely Cause
How the door behaves when it refuses to close is your best clue. Use this table to narrow it down before you start checking parts.
| What happens | Most likely cause | What to do |
|---|---|---|
| Door won’t start down and the opener lights flash | Safety sensors blocked, dirty, or out of alignment | Check and clean the sensors (safe to do yourself) |
| Door starts down, then reverses back up | Something crossing the sensor beam, or the door binding | Clear the doorway, check sensors, then watch the door move |
| Wall button works, remote and keypad don’t | Lock or vacation mode on the wall control, or remote batteries | Check the lock setting and batteries |
| Door touches the floor, then goes back up | Close travel limit set wrong, or an obstruction at the floor | Clear the floor, then check your opener manual or call |
| Door stops partway or closes unevenly | Binding, a track or roller problem, or a spring or cable issue | Stop using it and call for service |
Common Reasons a Garage Door Won’t Close
1. The Safety Sensors Are Blocked, Dirty, or Misaligned
This is the most common reason a door won’t close. Every automatic garage door opener sold today has safety sensors, also called photo eyes, mounted near the floor on each side of the door. One sends an invisible beam across the opening and the other receives it. If the beam is broken, the opener won’t close the door, or it will reverse a door that’s already moving down. That’s exactly what the sensors are designed to do.
The beam can be interrupted by things you might not notice: a recycling bin, a broom, a bag of potting soil, leaves, a cobweb, or dust on a lens. A sensor bracket that got bumped by a bike or a car bumper can also knock the two eyes out of line. Most sensors have a small indicator light that changes or goes out when they aren’t lined up. We explain how to check them step by step below.
2. Damaged or Disconnected Sensor Wiring
The sensors are wired to the opener with thin low-voltage wire that usually runs along the wall and ceiling. A staple driven through the wire, a chewed wire, or a loose connection at the sensor or the opener can make the opener act as if the beam is blocked. Garage door manufacturer Garaga’s opener troubleshooting guide notes that most flashing-light errors on newer LiftMaster, Chamberlain, and Craftsman openers trace back to the photo-eye system, either sensors knocked out of alignment or wires that were cut or poorly installed. If the lenses are clean, nothing is in the way, and the eyes are lined up but the door still won’t close, the wiring is the next suspect.
3. The Lock or Vacation Mode Is On
Many wall controls have a lock or vacation button that blocks remotes and keypads from operating the opener. If the door responds to the wall button but not to the remote or keypad, check whether the lock feature is turned on. Your opener manual explains how to turn it off. While you’re at it, try fresh batteries in the remote.
4. The Close Limit or Force Setting Is Off
The opener needs to know where “closed” is. That setting is called the close travel limit. If it’s set too far, the door hits the floor, the opener reads that as an obstruction, and the door reverses. If it’s set too short, the door stops a few inches above the floor and leaves a gap. Limits can drift over time, and changes in the door itself, like a worn bottom seal, can affect how the door meets the floor.
The force setting tells the opener how much resistance to allow before it reverses. Don’t turn the force up to make a door close. A door that needs more force is usually binding or out of balance, and turning the force up can make the opener push harder on something, or someone, it should have reversed off of. If adjusting the limits per your opener’s manual doesn’t fix it, have the door looked at.
5. Something Is Blocking the Door or Track
Look along the floor and up both tracks. A small object on the threshold, ice or packed debris under the bottom seal, or something wedged in a track can stop the door or trigger a reverse. In winter, a door that reverses in cold weather can have other causes too. Our Idaho garage door winter checklist covers those.
6. A Track, Roller, or Hinge Problem
If the door scrapes, shudders, or tilts as it comes down, the issue may be mechanical. Worn rollers, a bent or misaligned track, or a damaged hinge can make the door bind partway down. The opener feels that resistance and stops or reverses. A door that runs crooked can also come off its track, which is a safety hazard. See our guide to what to do when a garage door is off track.
7. A Broken Spring or Cable
Springs and lift cables carry the weight of the door. If a spring or cable fails while the door is open, the door may drop unevenly, hang crooked, or refuse to move under the opener’s power. Don’t try to pull it down by hand. Springs are under high tension, and a door without working springs is extremely heavy. Not sure what kind of springs you have? Our guide to torsion vs. extension springs explains how to tell, and our garage door spring replacement page covers the repair.
Garage Door Stuck Open?
A door that won’t come down leaves your garage and home exposed. If you can’t get it closed safely, let us know it’s urgent and we’ll help you get it secured and working again.
How to Check Your Garage Door Safety Sensors
Since the sensors are the most common cause, start here. These steps are safe for most homeowners and don’t involve any parts under spring tension.
- Find both sensors. They sit low on each side of the door opening, usually on brackets attached to the track or wall.
- Clear the path. Move anything that sits between them, even something small or thin.
- Look at the indicator lights. On many openers, each sensor has a light. A light that is off or flickering on one side usually points to a misaligned or dirty sensor, or a wiring problem. Your opener manual explains what its lights mean.
- Clean the lenses. Wipe each lens with a soft, dry cloth, as the International Door Association recommends in its garage door care and maintenance guide.
- Check the alignment. The two sensors should face each other directly at the same height. If a bracket is bent or loose, gently adjust the sensor until its light is steady, then snug the mounting hardware.
- Check the height. The U.S. Consumer Product Safety Commission advises that an electric eye be installed 4 to 6 inches above the floor. Sensors mounted higher than that can miss a small child or pet.
- Look over the wires. Follow the wire from each sensor as far as you can see it. Look for staples through the wire, cuts, or loose connections.
Never bypass the sensors. Don’t tape them together, mount them high on the wall, or disconnect them to get the door to close. They are a federally required safety feature that keeps a closing door from coming down on a person, pet, or car. If they can’t be fixed by cleaning and alignment, call for service.
What You Can Check Yourself vs. What Needs a Pro
Safe to Check Yourself
- Clear objects and debris from the doorway and sensor path
- Clean and realign the safety sensors
- Look for visible damage to sensor wires
- Turn off lock or vacation mode and replace remote batteries
- Adjust travel limits following your opener manual
Leave to a Professional
- A door that is crooked, binding, or off its track
- Broken springs or frayed lift cables
- Bent tracks, damaged rollers, or cracked sections
- Sensor wiring that needs to be rerun or replaced
- An opener that keeps reversing after the basics check out
Once It Closes, Test Your Safety Features
A door that finally closes isn’t automatically a safe door. The reversing system and the sensors should both be tested regularly. The Consumer Product Safety Commission recommends inspecting the garage door and opener every 30 days and testing the reverse by placing a 2x4 on the floor in the door’s path. If the door doesn’t reverse when it strikes the board, the CPSC says the opener should be disengaged until it is adjusted, repaired, or replaced. See the CPSC’s garage door opener safety guidance for details.
To test the sensors, start closing the door and pass a long object, such as a broom handle, through the beam. The door should reverse. If either test fails, stop using the opener until it’s fixed. These tests take a couple of minutes, and they’re worth doing every month.
Garage Door Repair Across the Treasure Valley
Velocity Garage Door is a family-run company based in Meridian, Idaho. When a door won’t close, we find the actual cause, explain what we found in plain language, and recommend the repair that makes sense for your door. Emergency service is available when a door is stuck open or unsafe. We serve homeowners in Meridian, Boise, Nampa, Caldwell, Star, and across the valley. See all of our service areas, or read our garage door FAQs.
Still Can’t Get Your Garage Door to Close?
Tell us what the door is doing, and whether the opener lights are flashing, and we’ll help you figure out the next step.
Garage Door Won’t Close: Frequently Asked Questions
Why does my garage door go down and then back up?
Usually the safety sensors are blocked, dirty, or out of alignment, so the opener reverses the door as designed. It can also happen when the close limit is set too far, so the door hits the floor and reads it as an obstruction, or when the door is binding in its tracks. Start by clearing the doorway and cleaning and aligning the sensors.
Why are my garage door opener lights flashing and the door won’t close?
On many openers, flashing lights point to a problem with the safety sensor system, such as blocked or misaligned sensors or damaged sensor wiring. Your opener manual explains what its specific light pattern means.
Can I disconnect the safety sensors to close my garage door?
No. The sensors are a federally required safety feature that keeps the door from closing on a person, pet, or vehicle. Don’t tape them together, move them up the wall, or disconnect them. If cleaning and realigning doesn’t fix them, call for service.
How high should garage door safety sensors be?
The U.S. Consumer Product Safety Commission advises installing an electric eye 4 to 6 inches above the floor. Sensors mounted higher can miss a small child or pet.
Is a garage door that won’t close an emergency?
It can be. A door stuck open leaves your garage and home exposed, and a door that is crooked or has a broken spring or cable can be a safety hazard. Emergency service is available. Call or text 208-830-7413 and let us know it’s urgent.