Garage Door Makes a Loud Bang
A loud bang from your garage door almost always means a torsion spring has broken. The spring stores the tension that lifts your door’s full weight, and when it snaps, the release sounds like a gunshot inside the garage. Stop using the door immediately and call a professional – this is not a repair to attempt on your own.
Torsion springs are under extreme mechanical tension by design. That’s the whole point: the spring carries the weight so the opener motor doesn’t have to. When one breaks, the coil unwinds violently in a fraction of a second. Beyond the startling noise, the door is now effectively dead weight. Most openers are not strong enough to lift it safely without a working spring, and forcing them to try risks stripping the motor, bending the tracks, or pulling the door off its rails entirely. A broken spring is fixable the same day in most cases – but only by a technician with the right tools and the training to handle a loaded spring safely.
Why It Happens
Broken Torsion Spring (Most Common)
Torsion springs have a finite cycle life, typically measured in the number of times the door opens and closes. After years of daily use, the metal fatigues and eventually fails – usually without any warning beyond the bang itself. You can confirm this by looking up at the horizontal metal bar above the door. If you see a gap in the coil, or a spring that looks separated in the middle, that’s a broken torsion spring.
Broken Extension Spring
Some older doors use extension springs, which run horizontally along the side tracks rather than across the top. These can also snap under load, producing a similar bang. If the coil above the door looks intact but you notice a spring lying loose along the upper side rail – or a dangling cable – extension springs are likely the culprit. Like torsion springs, these are under serious tension and should not be handled by anyone who isn’t trained on them.
Snapped or Frayed Cable
The lift cables run from the bottom corners of the door up to the drum that winds them as the spring turns. A frayed cable can snap suddenly, and the sound is sharp enough to be mistaken for a spring failure. Look for a cable lying coiled on the floor, or one side of the door that now hangs lower than the other. A broken cable on one side throws the whole door off balance and can cause it to come down hard and crooked.
Opener Carriage or Trolley Failure
Less often, the bang comes from inside the opener unit itself – specifically the carriage or trolley that the door arm connects to. If the carriage cracks or the drive gear strips under strain, it can produce a loud pop followed by the door simply not moving. In this case the spring usually still looks fine and the door may still move smoothly if lifted by hand. The opener will hum but nothing travels down the rail.
What to Do Right Now
- Stop using the door. Don’t operate it with the opener or try to lift it manually until you know what broke. A door without a working spring can weigh 200 to 400 pounds and will fall if the opener can’t hold it.
- Look, don’t touch. From a safe distance, look at the spring bar above the door and the cables along the sides. If you see a gap in the spring coil or a loose cable, that tells you and your technician exactly what happened. Take a photo if you can do it safely from the ground.
- Do not attempt to adjust, wind, or touch the springs or cables yourself. Torsion springs store enough energy to cause serious injury if they release unexpectedly. This is a hard stop – it is not about skill level, it is about the physics of stored mechanical tension.
- Disconnect the opener if the door is closed and secure. Unplug the opener unit from the ceiling outlet so no one accidentally hits the wall button while you’re waiting for service. This prevents the motor from straining against a door it can’t lift.
- Call (844) 755-5838. A live person answers around the clock – nights, weekends, and holidays included. Give them what you saw and they’ll dispatch your local Mainspring Garage Door Co. team.
How We Fix It
When your local Mainspring Garage Door Co. technician arrives, the first thing they do is a full visual inspection – spring, cables, drums, tracks, and opener – before quoting a single dollar. You’ll get the price in writing, flat, before any work begins. No surprises on the bill.
If it’s a broken torsion spring, the technician removes the old coil, installs the correct replacement spring sized for your door’s weight and height, and winds it to the proper tension using calibrated winding bars. If a cable snapped, it gets replaced at the same time, because a worn cable on one side almost always means the other side isn’t far behind. Most spring and cable repairs are completed in a single visit because our trucks carry the springs, cables, and hardware to handle the most common door sizes without a parts run.
The work is covered by Mainspring’s 90-Day Done Right Promise: if it’s not right, we come back. In writing. No arguing. This job falls under our Garage Door Repair service, and if the opener was damaged in the failure, our Garage Door Opener service covers that side of the work in the same visit.
Frequently Asked Questions
Yes – a broken spring is one of the more serious garage door failures. The door is now unsupported dead weight, and the opener is not built to lift it safely without the spring doing its share. Beyond the door itself, the broken spring or cable can have sharp, uncoiled ends. Leave the door alone, keep children and pets away from the garage until it’s repaired, and call (844) 755-5838 so we can get someone out quickly.
It shouldn’t wait. Running the opener against a broken spring puts real strain on the motor, the drive gear, and the door’s hardware – and what starts as a spring replacement can become a more involved repair if the opener burns out trying to compensate. If the door is stuck open, your home is also unsecured until it’s fixed. Call (844) 755-5838 – we answer around the clock and can tell you exactly when we can get there.
In most cases, yes. Our trucks are stocked with springs, cables, and opener components, so there’s no waiting on a parts order. Your local Mainspring Garage Door Co. team works with your schedule, and because a live person answers every call, you’ll get a real answer about availability the moment you call – not a callback the next morning. Reach us at (844) 755-5838 any time.
Springs don’t usually give much notice. They’re rated for a set number of cycles, and once the metal has been wound and unwound enough times, it reaches a point of fatigue and lets go. A door used twice a day will cycle through a spring’s life in years, not decades. If your door is more than ten years old and one spring breaks, it’s worth asking the technician about the other spring’s condition – they often fail within months of each other because they’ve logged the same number of cycles.
Get It Fixed
Call (844) 755-5838 – a live person answers right now, day or night. Your local Mainspring Garage Door Co. team arrives stocked, quotes the job in writing before starting, and backs every repair with the 90-Day Done Right Promise. One call, one visit, done right.
Written by Carl Dutton, Owner at Mainspring Garage Door Co., serving local communities since 1984.