A garage door that won't open is one of the most frustrating home problems — especially when you're running late. The good news: there are only a handful of things that cause this, and most are easy to diagnose. Go through this list in order.

⚡ Quick Check First

  • Is the opener plugged in and the outlet working?
  • Did the circuit breaker trip?
  • Is the manual lock bar engaged on the inside of the door?
  • Is the disconnect cord (red rope) hanging down — meaning the door was manually released?

The 6 Most Common Causes

Cause #1

Dead Remote Battery

This is the most common cause — and the most embarrassing, because it's an easy fix. If the wall button opens the door but the remote doesn't, it's almost certainly just a dead battery.

✓ Fix: Replace the battery (usually CR2032 or AA) — available at any hardware or drugstore.
Cause #2

Broken Torsion Spring

If you heard a loud bang (often described as a gunshot) and now the door won't open, the spring broke. You may see a gap in the coil above the door. The opener motor will run but the door won't budge — or it lifts only 6 inches before stopping. This is the #1 mechanical cause of a door not opening.

Do not try to force the door open. Operating it with a broken spring can damage the opener and cables, and the door can crash down suddenly.

✓ Fix: Call a technician. Spring replacement is not a DIY repair — springs are under extreme tension.
Heard a bang? Spring is probably broken.

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Cause #3

Power Outage or Tripped Breaker

Check your garage outlet and circuit breaker panel. If the power is out, you can still open the door manually: pull the red emergency release cord hanging from the opener trolley, then lift the door by hand. Once power is restored, reconnect the door to the opener by pulling the cord back or pressing the opener button with the door closed.

✓ Fix: Reset the breaker. Use the red release cord to open manually during outages.
Cause #4

Misaligned or Blocked Safety Sensors

Every modern garage door opener has two safety sensors — small devices mounted about 6 inches off the ground on each side of the door frame. They send an invisible beam across the opening; if the beam is interrupted, the door won't close (and sometimes won't open). Look for a blinking orange or red light on one of the sensors. Dirt, a misaligned bracket, or something blocking the beam will cause this.

✓ Fix: Clean the sensor lenses with a dry cloth. Make sure nothing is blocking the beam. Bend the bracket back so both sensors face each other — both lights should be solid (not blinking).
Cause #5

Limit Switch Needs Adjustment

The opener has limit switches that tell the motor when the door is fully open or fully closed. If the close limit is set incorrectly, the opener thinks the door is hitting the ground before it actually does, and reverses. You'll notice the door going down a few inches then reversing back up, or the opener motor stopping before the door reaches the ground.

✓ Fix: Consult your opener manual to adjust the down-limit screw. Usually located on the side of the motor unit. This is a DIY fix on most openers.
Cause #6

Failed Opener Motor or Logic Board

If the opener hums but the door doesn't move, or makes clicking noises, the motor or circuit board may have failed. Older openers (10+ years) are prone to capacitor failure. If you smell burning or see scorching near the motor unit, turn off power immediately.

✓ Fix: Call a technician to diagnose. Depending on the opener's age, repair or replacement may be recommended.

How to Get Your Car Out Right Now

If none of the above quick fixes work and you need your car immediately:

  1. Find the red emergency release cord hanging from the trolley on the ceiling track
  2. Pull the cord to disconnect the door from the opener carriage
  3. Lift the door manually — grab the bottom of the door and lift straight up
  4. If the door is too heavy to lift, a spring is broken — do not force it
  5. Once the car is out, you can lower the door manually and secure it from inside

When to Call a Professional

Call a technician if:

  • You can see a gap or break in the spring coil
  • The door is too heavy to lift manually
  • The door makes grinding, scraping, or popping noises
  • The opener motor runs but the door doesn't move
  • Cables look frayed, kinked, or are off the drum
  • The door is bent, off-track, or sitting unevenly

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Frequently Asked Questions

Start with the basics: replace the remote battery and check if the wall button works. If the wall button works but the remote doesn't, you need a new remote or reprogramming. If neither works, the issue is likely power, the motor unit, or the logic board.
Most garage doors have an emergency release — a red cord hanging from the trolley. Pull it to disconnect the door from the opener, then lift the door manually. If the door is too heavy to lift, a spring is likely broken. Call a technician.
Many opener problems — a bad capacitor, failed circuit board, worn drive gear — can be repaired at a fraction of replacement cost. A technician can diagnose whether repair or replacement makes more sense based on the opener's age and the extent of the problem.
The most common cause is misaligned or dirty safety sensors. Look for a blinking light on the sensor mounted near the floor on either side of the door. Clean the lenses and realign the sensors so both lights are solid. If that doesn't fix it, check for an obstruction in the door's path or call a technician to adjust the close-limit switch.