🔧 Fix-It Guide · free checks first
Loud Bang and Now the Garage Door Won't Lift?
Honest diagnosis, free checks first, and a straight answer about when it's a pro job. No teaser fees, no scare tactics — that's the whole point of this site.
Honest diagnosis, free checks first, and a straight answer about when it's a pro job. No teaser fees, no scare tactics — that's the whole point of this site.
With the door closed, look at the coil on the shaft above the opening. A broken torsion spring shows an unmistakable two-inch gap between separated coil halves. On extension-spring doors, look along both horizontal tracks for a separated or dangling spring. Binoculars or a phone zoom work fine. Do not touch, tap, or test anything by hand.
From the floor, verify both lift cables run taut and straight from the bottom corners up to their drums, seated in the drum grooves. Slack, frayed, or jumped cables corroborate a spring failure and belong on the technician's list. Also note whether the door sits level in the opening; a crooked door means uneven tension and reinforces the stop-and-call decision.
Press the wall button once if you have not already witnessed the failure: a motor that strains, lifts a few inches, and quits confirms the diagnosis. Then stop. Repeated attempts force the opener to drag dead weight, which strips the drive gear or burns the motor — turning a spring repair into a spring-plus-opener repair. Unplug the opener if others in the house might try it.
Take clear photos of the spring gap, both cable drums, the full spring shaft, and a wide shot of the door — plus the sticker with the door's size and the opener model. Texting these to the repair company lets them arrive with correctly sized springs on the truck, usually converting the job to a single same-day visit.
Almost certainly a spring breaking. A torsion spring is a steel coil wound tight around a shaft above your door, storing enough twisting force to counterbalance a door weighing 130 to 350 pounds. Springs are consumable parts rated in cycles — one cycle is one open and close — and standard springs are built for roughly 10,000 cycles, which works out to 7 to 12 years for a family using the door several times daily. Steel fatigues, a microscopic crack grows, and one day (disproportionately a cold day, since cold steel is more brittle) the spring lets go, releasing all that stored energy instantly. The coil recoils violently around the shaft it is mounted on — which is exactly what the shaft is for, containing the failure — and the sound is a bang or crack loud enough that homeowners regularly mistake it for a break-in or something falling. Many people find nothing amiss and only connect the sound to the door the next morning, when the opener strains and the door will not rise.
Diagnosis is visual, and you should keep it that way. With the door closed, look up at the shaft above the door opening. A healthy torsion spring is one continuous tight coil; a broken one shows a clean gap of about two inches where the two halves have sprung apart and separated. That gap is definitive — nothing else looks like it. Supporting evidence: the lift cables at each side of the door may hang slack or sit unwound off their drums, because the cables lost the spring tension that keeps them taut; the door may look slightly crooked in the opening; and if you press the opener, the motor strains, lifts the door a few inches at most, and quits. On extension-spring doors (springs stretched alongside the horizontal tracks rather than a shaft overhead), a break shows as a separated spring, sometimes dangling — this is why those springs should always have a safety cable threaded through them, which contains the pieces. Look, note what you see, photograph it for the technician if you like, and touch nothing.
Sometimes, but read this whole answer first, because this is where people get hurt. With the spring broken, the counterbalance is gone and the door is dead weight — up to several hundred pounds on a double door. If you pull the red release cord and lift, you are lifting all of it, and the greater danger is the other direction: a manually raised, unsprung door has nothing holding it up, and if it slips from your grip it comes down with its full weight and real speed. If you must get a vehicle out: use two strong adults minimum for a double door, lift together, and do not let anyone's fingers curl into the panel joints, which scissor closed as sections articulate. Once raised, secure the door before anything passes under it — locking pliers clamped onto both tracks directly beneath the bottom roller, or a sturdy support, on both sides. Never rely on the opener or friction to hold it. If the door is too heavy or you have any doubt, leave the car in and wait; same-day spring service is the norm in most markets.
We route every spring job to a pro, and here is the honest mechanical reason rather than hand-waving. Replacing a torsion spring requires unwinding the remaining tension in the old spring and winding precise tension into the new one, done at arm's length overhead using steel winding bars seated into holes on the spring's winding cone. A wound residential spring stores enormous torque, and every failure mode in that procedure — a slipped or wrong-size bar, an improvised tool like a screwdriver, loosening the wrong set screws, mis-sequenced steps — releases that torque instantly through the bar or the spring itself, faster than any human reaction. The U.S. Consumer Product Safety Commission has documented the injuries this produces: fractures, lacerations, head and face trauma. Beyond raw danger, there is judgment involved: springs must be matched to the door's exact weight and track geometry by wire size, diameter, and length, and wound to a turn count matched to door height — errors leave a door that slams or flies. Technicians do this daily with correct bars and matched springs. This is the one garage-door repair where the free-fix-first philosophy has a hard boundary.
On a two-spring door, yes, and this is not upsell — it is arithmetic. Both springs were installed the same day and have flexed the same number of cycles; they are the same age in the only unit that matters, cycles of fatigue. When one lets go at roughly 10,000 cycles, its twin is at roughly 10,000 cycles too, and its remaining life is short. Replacing only the broken one commonly buys a repeat visit within months — a second service call, a second stretch of a door that will not lift, for the price of having skipped one spring while the technician, ladder, and winding bars were already there. Replacing in pairs also keeps the door balanced, since a new spring paired with a fatigued one pulls unevenly. Worth asking your technician about: high-cycle springs, rated for 20,000 cycles and up, which cost more but proportionally less per cycle, and make sense for households that run the door many times a day. A good pro will weigh the door and quote options rather than defaulting silently.
The lift cables deserve a look whenever a spring fails, because the two systems work as one. Cables run from the bottom corners of the door up to drums on the ends of the torsion shaft; the spring twists the shaft, the drums wind the cables, and the cables lift the door. When a spring breaks mid-cycle, cables can jump off their drums, kink, or fray under the sudden load shift — and a frayed cable is itself a component under tension that fails energetically. Look, from the floor, without touching: are both cables seated in the grooves of their drums, running straight and taut down to the bottom brackets? Any birdcaged (bunched), frayed, or slack cable goes on the list for the technician, who should inspect them as part of any spring replacement and will typically recommend replacing worn ones in the same visit at modest added cost. One absolute: the bottom brackets the cables anchor to are under the same tension family as the springs. Do not unbolt them, ever — that warning label on the bracket is there for the same CPSC-documented reasons.
Don't. The opener is designed to guide a balanced door, not hoist an unbalanced one; forcing it against several hundred pounds strips drive gears and burns motors, and many openers will simply refuse after sensing the load. Unplug it, keep the door closed if possible, and wait for the spring repair — most markets offer same-day service.
Cold makes spring steel measurably more brittle, so a spring already near the end of its fatigue life is likeliest to let go on a cold morning — often on the first cycle of the day, when metal is coldest and the microcrack that has been growing for years finally runs. It is the most seasonal failure in the garage door world.
Check anyway. On two-spring doors, one spring can break while the survivor limps the door along — heavier, slower, straining the opener and the remaining spring. Look for the coil gap above the door and listen for labored operation. Running a door on one spring accelerates the second failure and risks it happening mid-travel.
No — they fail differently but still store dangerous energy, and a stretched extension spring or its pulleys and brackets can release violently. They also require safety cables threaded through each spring to contain broken pieces, which many older installs lack. All spring work, torsion or extension, goes to a professional; ask them to add safety cables if yours are missing.
Talk to a local garage-door pro now. Free to call, no obligation, honest answers — the way it should be.