Garage Door Opener Not Working or Stopped? Nine Causes
Garage door opener not working? Five of nine causes need no tools. This troubleshooting guide checks all nine in order for LiftMaster, Chamberlain and Genie openers that stopped working: power, lock mode, the remote battery, photo-eyes and the release first, then travel limits, a broken spring, a stripped gear and a failed capacitor or logic board. Each step says what a North Carolina homeowner tests safely.
Why is my garage door opener not working?
A garage door opener stops working for 9 common reasons: no power, lock mode, a dead remote battery, blocked photo-eyes, a disconnected trolley, wrong travel limits, a broken spring, a stripped drive gear or a failed capacitor or logic board. The first five are homeowner checks.
A garage door opener, also called a garage opener or door operator, is the motorized unit that moves a balanced door. The springs carry the door’s weight; the opener only drives it up and down. Its powerhead, the box on the ceiling or beside the door, holds the motor, the drive gear and sprocket, a start capacitor on AC motors, the logic board, the radio receiver and the light.
When a garage door opener does not work, the symptom narrows the list before you touch anything:
Silent powerhead, no light
Power: the outlet, GFCI or breaker.
Remotes dead, wall button works
Lock mode, a remote battery or lost pairing.
Door reverses or will not close, lights flash
Photo-eyes blocked or out of line.
Motor runs, door stays put
Disconnected trolley, broken spring or stripped gear.
Hum or click, no movement
Broken spring, lock engaged or failed capacitor.
Causes 6 to 9 call for broken garage door opener repair: limits, gears, capacitors and boards are set or replaced inside the powerhead.
Garage door opener troubleshooting: which checks come first?
Opener troubleshooting starts with power and the wall control, then remotes, photo-eyes and the release, because these five need no tools. Travel limits, springs, the drive gear and the capacitor or logic board come last, since each involves a technician, the powerhead or spring tension.
Work down the list and stop at the first check that fixes the door. Each step names who does it.
Check the outlet, GFCI and breaker (You)
Look for a lit powerhead light or wall control. Reset a tripped GFCI outlet or breaker. DASMA’s guidance calls for a grounded or GFCI receptacle and no extension cord.
Turn off lock mode on the wall control (You)
Lock mode blocks every remote while the wall button still works. On Chamberlain and LiftMaster units the lights flash twice when a remote is pressed in lock mode.
Replace the remote or keypad battery and re-pair it (You)
A fresh battery fixes most dead remotes. A remote that still fails needs pairing again with the learn button on the powerhead.
Clean and align the photo-eyes (You)
Wipe both lenses, clear the beam and turn the eyes until both LEDs glow steadily. Low sun shining straight into a sensor also stops the door.
Reconnect the trolley, with the door closed (You)
A pulled red release separates the door from the drive, so the opener runs and the door stays still. Reconnect it only with the door down: with a broken spring, an open door drops.
Reset the travel limits and force (Technician recommended)
A down limit set past the floor makes the door reverse; one set short stops it early. Force stays at the minimum needed and never makes up for a door that binds.
Inspect the springs from the floor (Technician)
Look only. A gap in a torsion coil above the door, or a stretched extension spring, means stop: leave the door where it is and unplug the opener.
Replace a stripped drive gear or rack (Technician)
White plastic shavings under the powerhead and a motor that runs without moving the trolley point to the gear. The powerhead is opened and the limits reset afterwards.
Replace a failed capacitor or logic board (Technician)
A brief hum with no start points to the capacitor on AC units. A dark powerhead with power present, after a storm or surge, points to the logic board.
Reached step 6 and the door still will not move? The rest is technician work. Call (833) 752-1196.
Why does my garage door opener hum but the door does not move?
An opener that hums without moving the door is running against something it cannot move or is not connected to. Chamberlain’s list: a broken spring, the lock engaged, a trolley stuck on its stop bolt, a disconnected door, a stripped gear or rack, or a failed capacitor.
Chamberlain’s support page reads the length of the hum as a clue to the cause, and the clue changes with the drive type.
| Drive | Hum | Chamberlain’s stated cause |
|---|---|---|
| Chain or belt | Brief | Broken springs, the door lock activated, or the trolley stuck on the stop bolt |
| Chain or belt | About 30 seconds | Door not connected to the opener |
| Screw drive | Brief | Broken springs, the door lock activated, or a capacitor problem |
| Screw drive | Longer than 5 seconds | Rack stripped |
| Screw drive | Until unplugged | Receiver logic board damaged |
| Wall-mount | 1 to 2 seconds | Door disengaged |
| Wall-mount | More than 2 seconds | Collar slipping on the torsion bar |
Stop pressing the button after the first hum. A motor straining against a door it cannot lift wears the drive gear, and a broken spring is the most dangerous cause on the list. Chamberlain adds that a brief hum which continues after a new capacitor means a damaged motor. A brief hum is one of the garage door broken spring symptoms; a loud bang, a gap in the coil and a door too heavy to lift are the others.
Why does my garage door reverse or refuse to close?
A garage door reverses or refuses to close when the photo-eyes see a blocked or misaligned beam, when the down travel limit is set past the floor, or when the door binds in its tracks. Chamberlain openers flash their lights 10 times for a sensor fault.
The photo-eyes are the two small sensors near the floor on each side of the door. They send an invisible beam across the opening, and a break in that beam stops a closing door and sends it back up. A box, a cobweb or a sensor knocked off line is enough. LED colors and alignment steps are in the guide for a garage door sensor not working.
A door that touches the floor and then reverses is a limit problem: the opener reads the floor as an obstruction. A door that stops and reverses part-way with a clear beam is binding in its tracks, and raising the force setting only hides that fault. Both are adjustments a technician makes after checking that the door moves freely by hand.
Why is my garage door remote not working?
A garage door remote stops working because of a dead battery, lock mode on the wall control, lost pairing or radio interference. Near North Carolina military bases, land mobile radios on 380 to 399.9 MHz swamp openers that receive around 390 MHz.
A rolling-code remote sends a new code on every press, and the receiver in the powerhead accepts only remotes paired to it. Replace the battery first. A remote that works only a few feet from the door, with a fresh battery, points to interference.
Resetting and reprogramming are different jobs. A reset power-cycles the opener: Chamberlain’s answer to its 2-1 to 2-5 codes is to unplug it for 5 seconds. Reprogramming pairs a remote or keypad with the learn button and erases old codes. The guide to programming the remote and keypad covers both, and technicians program remotes, keypads and HomeLink bridges on a visit.
Military land mobile radios use 380 to 399.9 MHz, with the worst overlap at 387 to 393 MHz, and DASMA notes that openers working near 390 MHz, including older Chamberlain, LiftMaster and Genie units, were affected. North Carolina bases near homes include Fort Bragg, Camp Lejeune and MCAS New River, MCAS Cherry Point and Seymour Johnson AFB. Genie offers a dual-frequency 315/390 MHz retrofit kit or Wi-Fi control as the fix, and the guide to opener interference from military radios covers the reported range and the checks to run first.
Why is my LiftMaster, Chamberlain or Genie opener not working?
LiftMaster, Chamberlain and Genie openers fail for the same 9 causes, but each brand reports them differently. LiftMaster and Chamberlain flash lights or UP/DOWN arrow codes and log a hum or click as code 1-5; Genie Excelerator units blink a status light.
LiftMaster and Chamberlain light flashes
10 flashes mean a sensor fault; 2 flashes mean lock mode is on.
Security+ 2.0 and 3.0 arrow codes
The UP and DOWN arrows on the powerhead blink a two-part code; 1-5 means the opener hums or clicks and the door barely moves.
Genie Excelerator status light
5 blinks point to the Safe-T-Beam sensors.
The full Security+ arrow-code and Excelerator blink tables are in the guide to garage door opener blinking and beeping codes.
Checks 7 to 9 are where the homeowner’s list stops and the powerhead comes apart. Technicians handling garage door opener repair in Hickory, for example, open LiftMaster, Chamberlain and Genie powerheads in chain-drive, belt-drive and wall-mount jackshaft versions.
What should you do with a broken garage door opener?
Make a broken garage door opener safe before anyone diagnoses it: unplug the opener, look at the springs from the floor, and move an intact door by hand with the emergency release, pulled only while the door is closed. A door with a broken spring stays where it is.
The red release cord unlatches the trolley from the drive, so a balanced door lifts by its handles while the opener is out of service. The garage door emergency release guide covers the pull, the lift and the reset. An open door is left where it is: once disconnected, a door with a weak or broken spring falls fast, as Chamberlain’s release instructions warn.
A broken opener that leaves the garage open at night or before a storm calls for emergency help for a door stuck open, and the phones are answered 24/7. Any other fault waits for a visit, where the technician decides between repairing one part and replacing the opener.
When to call a technician about a garage door opener
Call once the first five checks are done and the door still hums, clicks, reverses at the floor or sits dark with power present. From that point the fault is inside the powerhead or in the door’s springs, and both call for tools, parts and spring knowledge.
An opener never lifts the weight a spring carries: with a broken spring, leave the door where it is, keep people and cars clear, and unplug the opener.
A technician checks the door’s springs and balance first, then the sensors, controls and powerhead. On the spot, the technician prices the opener repair and waits for your yes. Monday to Saturday, a call booked by 12 pm gets a same-day inspection visit. There is no trip fee.
Some openers are not worth fixing. A unit made before 1993, or one needing a new board and gear together, is usually better served by an opener replacement. Before choosing one, compare chain, belt, screw or wall-mount drives.