You press the button, the door starts down, and then it stops or goes right back up. Or it doesn’t move at all. A garage door that won’t close is more than annoying: it leaves your home open. The good news is that the cause is often simple. Here are the most common reasons, in the order we usually check them, and what you can safely do yourself.
1. The safety sensors are blocked, dirty or out of line
This is the number one reason a door won’t close. Every modern opener has two small sensors near the floor, one on each side of the door. They send an invisible beam to each other. If anything breaks that beam, the door reverses so it can’t close on a person, pet or car.
What to check:
- Look for anything in the doorway: a trash can, a bike wheel, a box, even a spider web or leaves in front of a sensor.
- Wipe both sensor lenses with a soft, dry cloth.
- Look at the small lights on the sensors. On most openers, both should be steady. A blinking or dark light usually means the sensors are out of line or a wire is damaged.
- If a sensor was bumped, gently turn it back so it points straight at the other one.
Low morning or evening sun shining straight into a sensor can also confuse it. If your door only refuses to close at certain times of day, that’s a likely cause.
2. The opener light blinks and the door won’t go down
Many openers blink their light when the sensors see a problem. Some also blink a code that points to a specific fault. Check your opener’s manual or the label on the motor unit. If the code points to the sensors, go back to step 1. If it points to something else, it’s time to call a technician.
3. The wall control is in lock or vacation mode
Many wall buttons have a lock switch. When it’s on, remotes stop working, but the wall button may still work. If your remote won’t close the door but the wall button will, look for a lock button or a small lock icon on the wall control and turn it off.
4. The remote needs a new battery
If the wall button works and the remote doesn’t, try a new battery. If that doesn’t help, the remote may need to be reprogrammed, or the opener’s receiver may have a problem.
5. The close limit or force setting is off
The opener has settings that tell it where “closed” is and how hard to push. If the limit is set too short, the door stops before the floor. If the force is set too low, the opener thinks it hit something and reverses. Cold weather can stiffen the door and trigger this too. Adjusting these settings is a job for someone who knows the opener, because the wrong settings can disable the safety reverse.
6. Something is wrong with the door itself
Sometimes the opener is fine, and the door is the real problem:
- A broken spring. If you heard a loud bang and the door now feels very heavy, a spring has likely snapped. Don’t keep using the opener.
- A snapped or loose cable. The door may hang crooked, with one side lower than the other.
- Bent tracks or worn rollers. The door binds partway down, and the opener reverses because it senses resistance.
- A door off its track. If rollers have come out of the track, stop right away. The door can fall.
7. The door is disconnected from the opener
If someone pulled the red emergency release cord, the motor runs but the door doesn’t move. On most openers, running the opener through a full cycle, or pulling the cord toward the motor, reconnects the trolley. Only do this if the door is working normally otherwise.
What not to do
- Don’t tape over the sensors, move them to the ceiling, or bypass them. They’re a required safety feature.
- Don’t hold the wall button down to force a door with a broken spring or cable to close.
- Don’t touch the springs, cables or bottom brackets. They’re under high tension.
- Don’t stand or let children stand under a door that’s acting up.
How to secure the house in the meantime
If the door is stuck open and you can’t fix it quickly, lock the door between the garage and the house, take the remote out of any car parked outside, and move valuables out of sight. Our post on what to do when a garage door is stuck open has more tips.
When to call a professional
If you’ve cleaned and lined up the sensors, checked the lock switch and the remote, and the door still won’t close, the problem is likely inside the opener or in the door’s springs, cables, rollers or tracks. A trained technician can find the cause, show it to you, and give you the exact price before any work starts.
Need help today?
Proactive Garage Door Repair fixes doors that won’t close across Brunswick, Medina County and Northeast Ohio 24/7. 24/7, a real human answers. No AI. Technicians nearby, often at your door within 1 hour. We call you when we’re on the way. The estimate is free, and you get the exact price before any work starts. Learn more about our sensor, remote and keypad repair or call (440) 876-4444.
