Garage Door Troubleshooting: Won’t Open, Won’t Close, Opener Not Working, Noisy — Safe Checks Before You Call

Before anything else: the two things never to touch

A sectional door is a counterbalanced system: torsion springs on a shaft above the opening, or extension springs beside the horizontal tracks, carry its weight through two lift cables that run down to the bottom brackets. The opener does not lift the door; it moves a door the springs have already balanced, which is why DASMA, the door manufacturers’ association, says safe operation depends on a balanced door.

Never touch the spring system — springs, shaft, the drums the cables wind onto, the cones and set screws holding the tension — or the cables and bottom brackets. A wound spring stores the energy that lifts the door. DASMA says the bottom brackets are under extreme tension and are adjusted only by a trained door systems technician, and that frayed cables are replaced only by one; the instruction text federal rules require in every opener manual says the same of cables and spring assemblies. A failed spring or cable is a spring replacement or a cable and off-track repair, not an adjustment.

A gap in a spring coil, a slack cable or a crooked door means stop using the door, by hand and by opener. Keep people and cars out from under it and call emergency garage door repair; a door with a broken spring weighs its full weight again.

Symptom index

Find the matching line, then read its section. For a driveway gate, use the gate troubleshooting guide instead.

Won’t close

A door that opens but refuses to close, or comes back up before the floor, starts with its photo eyes: the two sensors on the tracks near the floor, one sending an infrared beam and one receiving it, no higher than six inches off the floor. Anything that breaks the beam while the door closes — a bin, a broom, a cobweb — reverses the door. On LiftMaster and Chamberlain sensors, both lights steady means aligned and working, a blinking green light means misaligned or blocked, and a dark light points to wiring; other brands differ, and the manual decodes them.

Wipe both lenses, clear the beam, and look for a bracket that has been kicked out of line. Nudging a loose eye until its light holds steady is an owner’s job, with the opener unplugged first; rewiring is not. Chamberlain documents a door that opens but won’t close, lights blinking ten times, when low sun shines into the receiving eye; the fix is swapping the eyes to opposite sides or fitting sun shields. The eyes are the secondary entrapment protection the federal operator standard requires, and the instructions say they must not be disabled; taping one eye to face the other makes the door close on whatever is in its path.

A door that reaches the floor and then goes back up is a different fault: the opener takes the floor for an obstruction because the down travel is set a little too far. Flashing lights and a beep as it reverses mean an obstruction or too much closing force, and the door — dry rollers, a bent track, a cracked hinge, lost balance — is the first suspect.

We don’t give travel and force steps, on purpose. Chamberlain’s guidance says force must never be raised to compensate for a binding door and that the safety reversal must be retested after any change; the required instruction text says to test monthly with a 1½-inch object or a 2×4 laid flat under the door. If the door binds, the fix is the bind, and settings are corrected on a repair visit after the door has been checked by hand.

If the door closes from the wall button but not from the remote, check the remote battery, then look for a lock setting on the wall control: many have a lock or vacation mode — Genie calls it Sure-Lock — that disables every remote and keypad while the wall button keeps working.

Won’t open

If nothing happens from the remote and the wall button, and the opener’s light stays off, it has no power. Plug a lamp into the opener’s outlet; if the lamp is dead, check the breaker or GFCI and reset it once, and if it trips again, leave it off and call. If the wall button works and the remote does not, check the battery, then the lock mode, then reprogramming. Locked out with no side door and no outside key release? Chamberlain states it plainly: there is no way to activate the opener from outside, so call.

If the opener runs and the door stays put, look up at the rail. A trolley sliding back and forth on its own — Chamberlain describes a thirty-second hum while only the trolley moves — means the door was disconnected at the emergency release. With the door fully closed and moving freely by hand, re-engaging it is an owner’s job: Genie’s instruction is to put the door back where it was when it was disengaged, then pull the cord toward the motor or the door until it clicks. If the door is open, heavy, stuck or crooked, leave it and call.

If the trolley is engaged and the opener strains, lifts the door a few inches and gives up, or hums briefly and stops, the door has become too heavy for it. Chamberlain’s and Genie’s troubleshooting both say a hum with no movement can mean broken springs or stripped gears, and the door should not be run until a technician has seen it. From the floor, a broken torsion spring shows a gap in the coil, and a broken extension spring hangs slack along the track. Stop pressing the button and book a spring repair. On older doors, a manual slide lock left engaged gives the same brief hum; the federal installation instructions say to disable every door lock when an opener goes in.

Opener not working

Treat the sound as a message. A brief hum, then nothing: a lock engaged, a broken spring, or a trolley jammed against the stop bolt at the end of the rail because the travel was set too far. Thirty seconds of hum with the trolley moving alone: the door is disconnected. A long hum on a screw-drive opener: Chamberlain says more than five seconds can mean the plastic rack along the rail has stripped. A click with no motor: a technician’s diagnosis with the power off.

An opener that works some of the time points to the inputs. Replace the remote and keypad batteries; Genie notes that some LED and CFL bulbs shorten remote range and that the antenna wire should hang free. If every remote fails together, suspect the receiver or the board. When the opener itself has failed, the choice is opener repair or opener replacement; age, parts availability and whether it has the battery backup California requires on residential openers decide it.

Noisy

A squeal or squeak: dry hinges, rollers or springs; DASMA says squeaky springs are often normal, a spray lubricant is the first step, and a noise that continues is a call. A rattle: loose hinge and track bolts, a slack chain, an opener bolted to the ceiling with no isolation. Grinding or scraping: worn or seized rollers, a bent track. One loud bang, then a door that won’t lift: a spring breaking, which is not a noise problem.

Chamberlain’s noise troubleshooting separates door noise from opener noise with one test: with the door closed, pull the release and move the door by hand. Noise that moves with the door is door hardware — lubricate the hinges and roller bearings and look at the rollers and track. A door that is quiet by hand but loud under the opener is an opener problem: chain or belt tension, a dry screw drive or, rarely, dry internal gears. Lubricant does not fix worn or bent parts, and a door that is noisy and also heavy or uneven by hand has a spring system out of balance, which DASMA calls an unsafe condition: stop there. A maintenance visit covers all of it in one trip.

Off track or crooked

A door hanging crooked, or with rollers out of the track, has stopped being a door and become a load; stop using it by hand and by opener. The crooked door is the signature of a lift cable that has frayed through or jumped its drum, letting one side drop while the spring still holds the other. Nothing here is a safe check: the bottom brackets are, in DASMA’s words, under extreme tension, and pushing the door into line, running the opener or pulling the release can bend sections, kink the track or drop the door. Keep everyone clear and call for an off-track repair.

Stuck half open

The rule for a door stopped partway is printed in every opener manual: never go under a stopped, partially open door. From the side of the opening, look for a roller out of the track, a slack cable or a gap in a spring. A door stuck because the opener lost power can be released and moved by hand as the next section explains; one stuck because a spring or cable has failed cannot, and a trapped car waits. Call the emergency line and keep the opening clear. A parking-garage or warehouse door gets the same rule — cone it off, and never pull a roll-up door down by hand; its springs sit inside the barrel — and commercial garage door repair is dispatched the same way.

The emergency release: when it is safe to pull the red cord

Every residential opener has one: federal rules require a means of detaching the door from the operator, with a red handle, at least six feet above the floor so it clears vehicles. It is safe to pull when three things are true: the door is closed — the required instruction text says to use the release only when the door is closed if possible, and Genie’s guidance is the same, because a closed door cannot move — the springs and cables are intact, and the door is undamaged and level in its tracks.

It is not safe when the door is open or partway open — the required warning reads: weak or broken springs may allow the door to fall rapidly, causing injury or death — when a spring or cable has failed, when the door is crooked, or when the released door is too heavy to lift. DASMA adds a caution even for a closed door: when the operator is disengaged, the door may unexpectedly begin to open, so stand clear and keep your fingers out of the section joints.

Lift by the handles or gripping points, never by the section edges, and keep the door in sight until it stops. A balanced door moves without strain and stays put at three or four feet off the floor; DASMA’s checklist uses that test, and a door that drifts down from open has lost spring tension and needs a technician. To reconnect, put the door back where it was when you released it and pull the cord toward the motor or the door until it clicks.

Power outage

Without battery backup, a garage door stays where it was when the power dropped. A closed, undamaged door with intact springs can be released and lifted by hand as above; keep another way back into the house, since the door will not open from outside. California’s SB 969 requires battery backup on residential garage door openers sold or installed in the state; our power-outage guide explains the statute, and a replacement opener with backup is an opener installation job.

What a repair visit does

We ask what the door does when you press the button, whether it is open or closed, and what you can see from the floor; that decides whether the call is an emergency. At night, a technician can come out if a car is trapped or the garage cannot be closed, with an after-hours charge after 8 pm; otherwise we usually suggest the morning. On site, the technician watches the door cycle, disconnects the opener with the door down and checks the balance by hand. Springs, cables, drums, rollers, hinges, track and sections are inspected before the opener, and the 2×4 reversal test and photo-eye test follow any repair. You see the price in writing before any work starts, with a replacement figure beside it if the door or opener is not worth repairing. We service every brand and are an authorized dealer for none; see garage door repair.