Garage Door Spring Repair
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Short answer
A broken garage door spring usually announces itself with a loud bang, after which the door is far too heavy to lift and the opener strains or does nothing. Springs counterbalance the door's weight and store a large amount of energy even when the door is closed, which is why replacement is a trained-technician job. Springs are normally replaced in pairs, because a matched pair that has cycled together will typically fail within a short time of each other.
Garage door springs counterbalance the door's weight and are the component most likely to fail suddenly and audibly — usually with a loud bang. Spring replacement requires specialized winding tools and should always be handled by a trained technician.
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Signs of a failing or broken spring
- A loud bang from the garage, followed by the door refusing to open
- The door feels unusually heavy when lifted by hand
- The door won't stay open partway or slams shut
- A visible gap in the coils of a torsion spring above the door
Torsion vs. extension spring replacement
Torsion springs mount on a shaft above the door and are wound to a specific tension using winding bars; extension springs run along the tracks and stretch under load, often paired with a safety cable run through the spring to contain it if it breaks. The correct replacement spring depends on the door's weight, height, and the drum/cable setup — an incorrectly sized spring can cause the door to be too heavy for the opener or to slam.
Why this isn't a DIY repair
A wound spring stores substantial energy, and releasing or winding it without the correct winding bars and clamping sequence is a serious injury risk regardless of mechanical skill level. This applies to both spring types. If a spring has broken, leave the door in its current position and contact a technician rather than attempting to lift it or wind a replacement spring.
What a spring replacement visit involves
- Confirm the door's weight, spring type, and correct wire gauge/length needed
- Safely unwind and remove the broken spring using winding bars
- Install and wind the replacement spring(s) to the correct tension
- Lubricate and inspect related hardware — cables, bearing plates, center bracket
- Test door balance and confirm smooth travel through the full range
One spring or two?
Many technicians recommend replacing both torsion springs together when one fails, since they typically wear at a similar rate and a mismatched pair can cause uneven lifting. This is a judgment call based on the age and condition of the remaining spring.
Is it the spring or the opener?
Springs carry the weight of the door; the opener only guides it. If the door is extremely heavy to lift by hand, will not stay partly open, or you heard a loud bang from the garage, suspect a broken spring. If the door lifts easily by hand but the motor hums, reverses, clicks or does nothing, the opener, its logic board, safety sensors or the remote is the likely cause.
| Symptom | Likely cause |
|---|---|
| Loud bang, door now very heavy | Broken torsion or extension spring |
| Door lifts easily by hand, motor does nothing | Opener, power or logic board |
| Door reverses right after touching the floor | Travel or force settings, or sensors |
| Door will not close and the light blinks | Safety sensor alignment or obstruction |
Spring service when
- The door is heavy to lift manually
- You see a visible gap in a coiled spring
Opener service when
- Manual operation is smooth
- The motor runs but the door does not move
- Sensors or the remote are involved
Safety note: Torsion springs store a large amount of energy and can cause serious injury. Do not attempt spring replacement or adjustment yourself.
Terms explained
- What is a garage door torsion spring?
- A torsion spring is the tightly wound spring mounted on a shaft above a garage door opening. As the door closes the spring winds and stores energy; as it opens the spring releases that energy to counterbalance the door's weight. Because a torsion spring holds high tension even when the door is closed, adjustment and replacement are professional work.
Frequently asked questions
Can I open my garage door if a spring just broke?
Avoid forcing it. Without a working spring, the door is far heavier than it's designed to be lifted, and the opener isn't built to lift that load alone. Use the manual release only if the door is closed, and call a technician.
How long do garage door springs typically last?
Springs are generally rated by cycle count (one cycle is opening and closing once) rather than years, so lifespan depends on how often the door is used and the spring's original rating.
Do I need to replace both springs if only one broke?
Not always required, but many technicians recommend it since the second spring is often close behind in wear, and a mismatched pair can cause the door to lift unevenly.
Why does salt air affect my springs?
Coastal humidity and salt air accelerate corrosion on spring coils and hardware, which can weaken them faster than in inland climates and increase the chance of sudden failure.
Sources
- Garage Door Openers — U.S. Consumer Product Safety Commission
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