Garage Door Won't Open: Motor, Sensors, Spring & Track Diagnosis
A garage door that won't open is usually caused by one of four things: a tripped opener circuit, misaligned safety sensors, a broken torsion or extension spring, or a track obstruction. Most causes can be confirmed in under 10 minutes. Broken springs are the exception — a torsion spring under tension can cause serious injury and should be replaced by a professional. Work through these checks in order before calling a technician.
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Common Symptoms
- Opener motor runs but the door doesn't move
- Opener makes a clicking sound and nothing happens
- Door starts to open then immediately reverses
- Door opens with the wall button but not the remote
- One side of the door appears higher than the other
- Visible cable has come off the drum on one side
Most Likely Causes
- 1
Misaligned or Blocked Safety Sensors (Most Common)
Garage door openers manufactured after 1993 have photo-eye sensors mounted 4–6 inches off the ground on each side of the door track. If these sensors are misaligned, dirty, or have anything blocking the beam, the opener will refuse to close (and on some models, refuse to open). A steady green light on the sending sensor and a steady green or amber light on the receiving sensor indicates proper alignment.
- 2
Broken Torsion or Extension Spring
Springs counterbalance the door's weight. A broken torsion spring (the horizontal coil above the door) or extension spring (the coils running along the sides) means the motor is lifting the full weight of the door — most openers have safety clutches that prevent this and stop operation. Look for a visible gap in the coil or a cable lying loose on the floor.
- 3
Opener Motor or Drive Failure
The motor capacitor, drive gear, or logic board can fail. If the motor hums but the door doesn't move, the drive gear or trolley may be stripped. If the motor is silent with power confirmed at the outlet, the logic board or motor winding has failed.
- 4
Track Obstruction or Misalignment
A bent track section, a roller that has jumped the track, or a foreign object in the track can physically block door travel. The door will start to move and then bind or stop at the same point every time.
- 5
Dead Remote Battery or Lost Programming
If the door opens with the wall button but not the remote, the remote battery is dead or the remote has lost its programming to the opener. Replace the battery first — it's the most common cause.
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Quick DIY Checks
Never attempt to repair or replace a broken torsion spring yourself. Torsion springs store enormous energy under tension — a spring that releases unexpectedly can cause severe injury or death. This is one repair that requires a professional.
If the door is held up by the opener with a broken spring, do not operate it. The opener is not designed to carry full door weight. Disconnect power to the opener and call a technician.
- 1Check the opener power: confirm the opener is plugged in and the outlet has power. Look for any indicator lights on the opener motor unit. Try the wall button — if nothing happens, check the circuit breaker for the garage.
- 2Inspect the safety sensors: look at both sensors at the bottom of the door tracks. Each should have a steady (non-blinking) light. A blinking or off light indicates misalignment or obstruction. Wipe both lenses clean with a dry cloth, then loosen the mounting wing nuts and adjust the receiving sensor (the one without a steady green light) until both lights are solid.
- 3Inspect the spring: look at the torsion spring (horizontal coil above the door). A visible gap or break in the coil means the spring is broken — do not attempt to operate the door or repair the spring yourself. Call a garage door technician.
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Try Pro — $7.99/mo- 4Try the manual release: pull the red emergency release cord hanging from the trolley rail. This disconnects the door from the opener drive. Try lifting the door manually — if it's extremely heavy or won't stay up, a spring is likely broken.
- 5Inspect the track: run your hand along both vertical and horizontal track sections and look for dents, bends, or a roller that has left the track. A bent track section can usually be straightened with a rubber mallet if the damage is minor.
- 6Replace the remote battery: if the door works on the wall button but not the remote, replace the remote battery (typically CR2032 or AA) and test. If a new battery doesn't help, reprogram the remote to the opener following the opener's manual.
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Repair vs Replace
Most garage door failures — broken springs, sensor replacement, drive gear — are straightforward repairs that cost far less than a new opener. Replace the opener only if the motor is seized, the logic board has failed on a unit over 12–15 years old, or you want to upgrade to a newer smart opener. A broken spring on an otherwise functional door is always worth repairing.
Est. Repair Cost
$150–$350 (spring replacement, professional); $50–$150 (sensors, drive gear, DIY)
Est. Replacement Cost
$700–$1,500 for a new opener installed
Recommended Tools & Parts
- Buy on Amazon →
Garage Door Opener Remote (Universal)
Universal replacement remote compatible with Chamberlain, LiftMaster, Craftsman, and most major brands. Programs easily to existing opener.
$20–$40
- Buy on Amazon →
Garage Door Safety Sensor Kit
Replacement photo-eye sensor pair for Chamberlain/LiftMaster openers. Includes wiring and mounting hardware.
$25–$45
- Buy on Amazon →
Garage Door Opener Drive Gear Kit
Plastic drive gear and worm gear replacement kit for Chamberlain/LiftMaster chain-drive openers — the most common mechanical failure.
$20–$35
- Buy on Amazon →
Torsion Spring (Professional Installation Required)
Torsion spring replacement requires professional installation — do not DIY. This link is for reference; have a technician quote the job.
$150–$300 installed
Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.
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Frequently Asked Questions
- My garage door reverses immediately after I press the open button — what's wrong?
- Immediate reversal when opening is almost always caused by misaligned or obstructed safety sensors. The opener is detecting a blocked beam and reversing as a safety measure. Clean the sensor lenses, check for anything blocking the beam path (spiderwebs, leaves, a garden hose), and realign both sensors until both indicator lights are solid (not blinking).
- The opener motor runs but the door doesn't move — is the spring broken?
- Possibly, but also check the trolley carriage. If the emergency release cord was pulled and not re-engaged, the trolley is disconnected from the door. Re-engage by pulling the release cord toward the motor unit until you hear a click. If the spring is broken, the motor may be running but the clutch is preventing damage — look for a gap in the torsion spring coil above the door.
- How often should garage door springs be replaced?
- Standard torsion springs are rated for about 10,000 cycles — approximately 7–10 years with typical residential use (4 opens and 4 closes per day). Higher-cycle springs (25,000–50,000 cycle) are available at modest additional cost and are worth specifying when you have springs replaced.