A garage door that won’t open can stop your plans, and your whole day, dead in its tracks. That can get incredibly frustrating, and become a safety issue in some cases. If you press the button, you expect something to happen, and when it doesn’t, there are five common potential causes. Those potential causes come in different shapes, sizes, and severities.
For example, a dead remote battery takes five minutes to replace, and many homeowners can do that themselves. But if there’s an issue with the torsion spring, that’s a whole afternoon wasted on a service call, because that’s far from a DIY repair.
Let’s explore how you can tell different kinds of garage door issues apart, so you’re not calling a technician for a tripped breaker or ignoring a broken spring because you assumed it was the remote. We’ll look at doors that won’t open at all, or that run the opener motor without moving.
Doors that open partially, slowly, or noisily are different problems.
What to Check Before Anything Else
Before touching anything mechanical, perform three simple checks.
- Look for an indicator light on the ceiling unit. If the light’s not on, the unit’s not getting power. Check any outlets, circuit breakers, and GFCI outlets on the same circuit. Garage circuits often share a breaker with the lights, and a tripped GFCI three feet away can kill the opener without any obvious sign.
- Try the button on the garage wall instead of the remote. If the wall button works but the remote doesn’t, that proves the issue lies with the remote itself. If neither works, keep going.
- Check for a manual slide lock on the inside of the door panels. This one’s pretty obvious: if the lock is engaged, the door won’t open.
If all three check out and the door still won’t move, you have a mechanical problem.
The Most Common Reason a Garage Door Won’t Open
The most common reason for a garage door not to open is a broken spring. These springs carry all the door’s weight, which can be up to 200 pounds on a standard two-car garage. If the spring’s not working properly, the opener motor is taking the full load, which it can’t handle. The motor will run and the trolley will move along the rail, but the door stays put.
The other tell is sound. Torsion springs, the horizontal coil above the door opening, fail with a loud bang. It usually happens overnight when a temperature drop adds the final stress to a fatigued coil.
If you heard a sharp crack before the door stopped working, you don’t need to look further. Check the torsion bar above the door. If there’s a noticeable gap in the coil, you’ll know it’s broken. Also check the extension springs along the horizontal tracks on each side of the door.
A broken one will be hanging loose or clearly separated from its mount. Don’t operate the door with a broken spring, and don’t attempt to replace the spring yourself. Torsion springs hold hundreds of pounds of stored tension and cause serious injuries when mishandled.
When the spring is broken, the door is often too heavy to lift safely and the car may be trapped inside the garage. This is the textbook situation that warrants a call for same-day garage door repair in Arlington, before you strain the motor by pressing the opener over and over.
Torsion Springs vs. Extension Springs
There’s a huge difference between repairing a torsion spring and an extension spring. Torsion springs sit on a bar above the door and wind under tension. Most modern two-car garages use them. Extension springs run along the tracks and stretch rather than wind. They are still common in older single-car garages. Both types are rated for roughly 10,000 cycles, which works out to seven to ten years in a typical household.
The Opener Is Running But the Door Isn’t Moving
If the motor runs, the trolley travels the full length of the rail, and the door doesn’t move, one of three things is happening:
- A broken spring (the most likely cause) – The trolley moves freely because it isn’t lifting anything. The door’s weight isn’t attached to anything functional. The trolley may have disconnected from the door arm.
- The door’s emergency release is tripped – Every opener has an emergency release, a red cord hanging from the trolley. If it’s been pulled, the trolley disconnects and runs the rail without moving the door. To reconnect it, pull the cord toward the door with the trolley in the closed position. Then move the door manually until you hear the trolley click back into place.
- A stripped drive gear – Inside the opener, a plastic gear meshes with a worm gear to drive the trolley. When it strips, which is common on older chain-drive units, the motor runs and you hear grinding or a high-pitched whir, but the trolley doesn’t move. This is usually an opener repair, not a door repair.
The Door Won’t Open Manually Either
Release the emergency cord and try lifting the door by hand. If it still won’t move, the problem is mechanical and the opener has nothing to do with it. A door that won’t lift manually is physically obstructed, off its track, or held by something structural.
A bent section of vertical track will stop the rollers where it’s bent. You’ll usually be able to see the bend, and the door will stop in the same place every time. On the other hand, a cable off its drum will let the door tilt to one side when you try to lift it. Don’t force it in either case.
One exception: in winter, water under the bottom seal can freeze the door to the threshold. A firm upward lift usually breaks it free, but again, don’t force it.
How to Release the Emergency Cord Safely
Pull the red cord straight down, or at a slight angle toward the door. You’ll hear a click when the trolley disengages. But don’t ever pull the cord while the door is moving. On a weakened spring, disengaging mid-travel can drop the door suddenly. Always let the door stop completely before pulling the release.
To re-engage after manual operation, pull the cord toward the motor unit to reset it to automatic. Then run the opener through one full cycle to confirm the trolley is back in the drive.
Sensor and Remote Problems That Look Like Bigger Issues
Two sensors sit near the bottom of the door tracks and send an infrared beam across the opening. If the beam is broken or a sensor is knocked out of alignment, the opener won’t operate.
Both sensor LEDs should show solid green when aligned. If one is blinking or off, loosen the mounting bracket and adjust until both are steady. Anything crossing the beam path, a box, a bike, a garbage bin, stops the opener.
Clear it and try again. If the wall button works but the remote doesn’t, replace the battery. Remote batteries last one to two years and fail without warning. If the battery isn’t the issue, the remote may have lost its pairing. Press the “learn” button on the motor unit, then press the remote button within 30 seconds to re-pair.
When Your Garage Door Won’t Open After a Power Outage
An outage introduces a specific set of problems because the door may have been working normally right before the power went out. Modern LiftMaster and Chamberlain openers have a battery backup that allows several cycles during an outage.
If yours has one, the opener should still function. Check for a battery indicator on the unit. If the backup is depleted, use the manual release. When power returns, some doors bind because the trolley re-engages slightly off position.
Run one full manual open-and-close cycle after re-engaging the trolley to reset the travel limits. If it still binds, the opener’s limit settings may need adjusting.
After storms and neighborhood outages, the common service issue is not always a failed opener. More often, it’s a trolley that re-engaged incorrectly, a depleted backup battery, or travel limits that need resetting.
Our garage door repair in Rockville team handles those post-outage calls throughout Montgomery County when the door worked before the outage and will not cycle correctly after power returns.
How to Operate Your Door Without Power
Pull the red release cord straight down. Lift the door from the bottom panel and keep your hands on it until it’s fully open. It won’t stay up on its own if the trolley is disengaged and the springs are weakened. Don’t stand or work under it if that’s the case; call a technician.
When power returns, pull the release cord toward the motor unit to reset to automatic. Then run a full cycle to confirm.
When to Stop Troubleshooting and Call a Technician
There’s a clear line between what a homeowner can safely check and what makes the problem worse. Always call a technician when:
- the spring is visibly broken or you heard a bang before the door stopped working
- if the door tilts to one side when you try to lift it, because that’s a cable problem
- if the door stops at the same point every time, because that usually means bent track
- if the door has come off its rail entirely
The common denominator here is stored mechanical energy. Springs and cables under load are bursting with potential energy, and releasing that energy can have dangerous consequences.
For everything else, sensors, remotes, the emergency release, and a frozen seal, a careful homeowner can work through those safely.
FAQ
Why won’t my garage door open even though the motor is running?
Most likely a broken spring. When a spring fails, the motor runs and moves the trolley, but the door weight isn’t supported, so it won’t lift. A stripped drive gear inside the opener is the other common cause. You’ll hear grinding or a high-pitched whir rather than normal motor sound if that’s what’s happening.
Can I manually open my garage door if the spring is broken?
You can, but the full door weight is unsupported. Most people can lift it once, but it should not be done repeatedly. If you must open it to move a car, have another adult present to help hold the door and keep hands clear of the tracks and rollers.
How do I know if my garage door spring is broken?
Three signs usually confirm it: a gap in the torsion spring coil above the door, an extension spring hung low from the track, or a loud bang before the door stopped functioning.
If you disconnect the opener and lift the door by hand, it will feel extremely heavy or won’t lift at all on the side where the spring failed.
How much does it cost to fix a garage door that won’t open?
It depends on the cause. Sensor and remote issues cost nothing to fix yourself. A broken torsion spring usually runs $150 to $350. A stripped drive gear is often $100 to $200. Cable repairs are generally $75 to $200. Most are diagnosed and finished in a single visit.
The One Rule That Covers Most of It
If the motor runs but nothing moves, start with the spring.
If the door won’t lift manually either, stop and call someone.
If the wall button works, look at the remote.
If the door worked before a power outage but binds afterward, reset the trolley and run a full cycle.
If the sensor lights are blinking, fix the alignment before assuming the opener is dead.
The repair gets dangerous when the problem involves springs, cables, tracks, or a door that will not stay balanced by hand.
