Garage Door Won't Open or Close: 10 Causes Checked in Order
10 causes stop a garage door; look at the springs first. The order is safety-first: a hands-off look for a broken spring or snapped cable, then tripped power, lock mode, dead remote batteries, blocked photo-eyes, an obstruction, a pulled emergency release, wrong travel limits and a failed opener gear or board. Each step says what you fix yourself and when to call a technician instead.
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Why won’t my garage door open or close?
A garage door stops opening or closing because the opener has lost power or permission, the safety sensors see a blocked beam, or the counterbalance springs or cables have failed. Power, lock mode, batteries and sensors are homeowner checks; springs and cables are technician repairs.
The opener and the door are two machines. The wall button and remotes control the opener, which moves the door; the springs carry the door’s weight. An opener fault is usually a switch, a battery or a sensor you reset yourself. A door fault is a spring or cable under tension, and the springs and cables are the parts a broken garage door repair replaces on site.
Start at the step that matches what your door is doing:
Door heavy, crooked, or a cable hangs loose
Start at step 1 and stop there: this is a spring or cable fault.
Opener hums, door does not move
Start at step 1, then steps 8 and 10.
Nothing happens and the opener light stays dark
Start at step 3.
Wall button works, remote does not
Start at step 4, then step 5.
Door starts down, then reverses, or the opener lights flash
Start at step 6, then steps 7 and 9.
What to do when a garage door won’t open or close: the 10 checks in order
Check the springs and cables by eye first, then power, lock mode, remote batteries, photo-eyes, the door path, the emergency release, travel limits and finally the opener’s internal parts. This order rules out the dangerous faults before anyone presses the button again.
Steps 3 to 8 need no tools beyond a battery and a cloth. Steps 1, 2 and 10 end with a technician; step 9 usually does.
Look at the springs without touching them
Stand back and look above the door. A torsion spring sits on the steel shaft over the opening and counterbalances the door’s weight; the opener only moves a door the springs already balance. A visible gap between the coils means the spring has broken, often after a loud bang. Extension springs, found beside the overhead tracks on older doors, show the same fault as a snapped or sagging coil. DASMA’s rule: a door with a broken spring is not operated until the spring is replaced. Who fixes it: Technician.
Look at the cables and rollers
A lift cable runs from the bottom bracket on each lower corner of the door up to a drum on the spring shaft. A cable hanging slack or frayed beside the track, a roller sitting outside the track, or a door lower on one side means the counterbalance has failed. Keep hands off the cables, drums and bottom brackets: all three hold spring tension. Who fixes it: Technician.
Check the power and the GFCI outlet
A dark opener light and a dead wall button point to power, not the door. Check that the opener’s plug is seated in its ceiling outlet, press the reset button on any GFCI receptacle in the garage, and look for a tripped breaker. DASMA TDS 167 calls for a grounded or GFCI receptacle within cord length and no extension cord. Power restored but the opener still dead after a storm points to step 10. Who fixes it: You.
Turn off lock mode
Lock mode on the wall control blocks every remote and keypad while the wall button still works, so it looks like a remote fault. On Chamberlain and LiftMaster openers, 2 flashes of the opener lights mean the lock is on. Switch the lock off at the wall control and try the remote again. Who fixes it: You.
Replace the remote and keypad batteries
A remote that works only up close has a weak battery or a lost pairing. Fit a new battery, then re-pair it with the opener’s learn button. Radio interference is the third cause in North Carolina: Defense Department radios use 380 to 399.9 MHz, so older Chamberlain, LiftMaster and Genie openers listening near 390 MHz are exposed near bases such as Fort Bragg and Camp Lejeune. Who fixes it: You (batteries, re-pairing) · Technician (dual-frequency receiver or new opener).
Clean and align the photo-eye sensors
The two photo-eyes face each other across the opening, no higher than 6 in above the floor and within 6 in of the door’s path. A broken beam makes the opener refuse to close or reverse on the way down. Wipe both lenses and clear spider webs. A steady sensor LED means aligned; dim, blinking or off means aimed wrong, so loosen the wing nut, point the lenses at each other and tighten. Low sun on the receiving eye causes the same fault; shade it. Who fixes it: You.
Clear the door path
Anything in the door’s travel trips the safety reversal: a bin, a bike wheel, a rake leaning into the opening. Remove it and run the door again. A dented track section or a binding roller works the same way: the opener meets resistance and reverses. Who fixes it: You (objects) · Technician (bent track).
Reconnect the emergency release and unlock the door
The red emergency release handle hangs from the opener rail, no more than 6 ft above the floor, and disconnects the trolley from the drive. Once pulled, the chain or belt moves but the door stays put. With the door fully closed, reconnect the trolley as the manual shows. A manual lock bar left engaged holds the door shut while the opener strains; slide it back. Who fixes it: You.
Test the travel limits and force settings
The down travel limit sets where the door stops when closed. A door that reverses at the floor or stops short with daylight under it has a limit or force setting that no longer matches the door, for example after a new bottom seal or a heaved slab. Force stays at the minimum needed; raising it to push past a binding door defeats the safety reversal. Every adjustment ends with the reversal test. Who fixes it: Technician recommended.
Listen for a failed opener gear, capacitor or board
With the springs whole, the lock off and the trolley connected, the fault is inside the powerhead. A motor that hums without moving points to a failed capacitor or a stripped drive gear; white plastic shavings on the floor under the opener confirm the gear. An opener that stays dead after a storm surge, with power at the outlet, points to a failed logic board. Who fixes it: Technician.
Stopped at step 1, 2 or 10? Leave the door where it is and keep people and cars clear of it. Call (716) 328-9097: phones are answered 24 hours a day, 7 days a week.
Why do the lights on my garage door opener flash and my door will not close?
Flashing opener lights are a diagnostic code: on Chamberlain and LiftMaster openers, 10 flashes mean the safety sensors are blocked or misaligned and 2 flashes mean lock mode is on. Aligning or cleaning the photo-eyes clears the first; the wall control clears the second.
| Signal | Meaning | First check |
|---|---|---|
| Opener lights flash 10 times | Safety sensors blocked or misaligned | Step 6: clean and aim the photo-eyes |
| Opener lights flash 2 times | Lock mode is on at the wall control | Step 4: switch the lock off |
| Sensor LED dim, blinking or off | The photo-eyes do not see each other | Step 6: aim the lenses, then check the wire |
On Chamberlain and LiftMaster openers made before February 3, 2022, pressing and holding the wall push bar closes the door with a sensor fault, so the house is secure until the sensors are fixed. Watch the door all the way down. Newer units no longer have this override. Other brands use their own codes, listed in the opener manual.
Why won’t my garage door close all the way?
A garage door that stops short or reverses near the floor has a travel limit or force setting that no longer matches the door, or something in the track is binding it. Resetting limits and force follows the opener manual and ends with the reversal test.
The opener stops the door at its down limit and reverses when it meets more resistance than its force setting allows. A door that touches the floor and goes back up reads the floor as an obstruction: the limit is set too far or the slab has heaved. A door that stops short has a limit set too high. A dented track or seized roller makes it reverse partway.
The reversal test proves the fix. Lay a 1-1/2 in object, such as a 2×4 flat on the floor, under the center of the door and close it: the door reverses on contact. Federal rule 16 CFR 1211 requires openers made on or after January 1, 1993 to reverse within 2 seconds and to carry a secondary entrapment device, the photo-eyes on most homes.
How to open a garage door that won’t open
Pull the red emergency release handle while the door is fully closed, then lift the door by its handle, but only when both springs are intact. A door that feels very heavy or drops when released has a broken spring or cable and stays closed.
A balanced door lifts with little effort and stays where you leave it. Lift it by the handle, never by the panel joints, which pinch fingers. Lower it the same way, then reconnect the trolley. Never pull the release with the door open: a door with a failed spring falls the moment the opener lets go.
A door with a broken spring weighs its full weight in your hands. Leave it closed, and leave the car inside until a technician has seen it.
Some of these causes end the do-it-yourself checks entirely.
When to call a technician for a door that won’t open or close
Call a technician when a spring shows a gap, a cable hangs slack or frayed, a roller has left the track, the door is crooked, or the opener hums without moving. These parts carry full spring tension or need opener diagnostics.
A gap in a spring
The spring has broken; the door is not operated until it is replaced.
A cable slack, frayed or off its drum
The cable is under spring tension, and so are the drum and bottom bracket it connects.
A roller outside the track or a bent track
The door is partly unsupported and falls further when forced.
The door hangs crooked or feels heavy
One side has lost its counterbalance.
The opener hums, grinds or stays dead with power present
The capacitor, drive gear or logic board has failed inside the powerhead.
The technician checks the springs, cables and balance first, then the sensors and opener, and names the failed part. The technician gives you the price before any work starts, and the work starts only when you say yes. The visit ends with the reversal test, so the door leaves safe as well as working. 1-year labor warranty on every repair; parts carry the manufacturer’s warranty, which we register for you.
Same-day visits for calls booked by 12 pm, Monday to Saturday. No trip fee anywhere in our North Carolina service area. Phones are answered 24 hours a day, 7 days a week, and emergency service is available 24/7 in every city we serve.
Selling your home? Since June 1, 2026, North Carolina’s home inspection rules (11 NCAC 08 .1107) require home inspectors to report any opener that fails to reverse on resistance or at the photo-eye beam, and any opener with no photo-eyes. Call (716) 328-9097.