Guide · 2026-08-30 · 7 min read

Broken Garage Door Spring: What It Means, Why It Happened, What To Do

If you heard a loud bang from the garage and now the door won't lift more than a few inches, the most likely culprit is a broken torsion spring — the single most common garage door failure in the Phoenix Valley. The short version: stop using the door, don't try to lift it or force the opener, and don't attempt the repair yourself. Here's the full picture.

How to confirm the spring is broken

Look up at the shaft above the door opening (with the door closed). A healthy torsion spring is one continuous coil; a broken one shows a visible gap of an inch or two where the metal snapped. Other tell-tale signs: the loud bang when it let go, a door that feels enormously heavy to lift by hand, an opener that strains, hums or gives up after a few inches, and cables that suddenly look loose or have jumped off their drums.

Some doors use extension springs instead — long springs stretched along the horizontal tracks on each side. When one of those breaks you'll often see the spring hanging slack, sometimes with a safety cable running through it (if there's no safety cable, treat the door as dangerous and keep everyone clear).

Why springs break early in Arizona

Springs are rated in open/close cycles — commonly 10,000 for builder-grade parts, which works out to roughly 7–10 years of typical family use. Phoenix compresses that timeline. Garage temperatures here routinely pass 130°F in summer, and the daily expansion-contraction cycling fatigues spring steel faster than in milder climates. Dry air also strips lubricant, and a dry spring corrodes and pits, creating the weak point where it eventually snaps.

That's why a spring that 'should' have lasted a decade often goes in year six or seven in the Valley — and why the second spring on a two-spring door, which has lived the exact same life, is usually next.

Why this is not a DIY repair

A wound torsion spring stores a startling amount of energy — enough to break a hand or worse the instant a winding bar slips. It's the one garage door job that professionals themselves treat with the most respect, using proper winding bars, the correct spring rated to the door's measured weight, and the door secured throughout. Videos make it look routine; emergency rooms see the other side of that story every year.

There's also a quieter reason: spring sizing. A replacement spring has to match the door's weight and drum size, not just its length. The wrong spring 'works' for a while, then wears out the opener and fails early. Weighing the door and matching wire size, diameter and length is where a professional earns the visit.

What a proper spring repair looks like

A good spring visit runs like this: the technician confirms the failure and inspects the parts a snapped spring commonly damages on its way out — cables, center bearing, drums. You get a price before any work starts. The spring (usually both springs, if it's a two-spring door — the survivor carries identical age and fatigue) is replaced with a correctly rated part, the door is balanced so it lifts by hand smoothly and stays put half-open, and the opener's force settings are recalibrated so it isn't masking a badly balanced door. The whole job typically fits inside an hour or two when the parts are already on the truck.

If your door is heavier than standard — oversized, wood-clad or insulated — ask about high-cycle springs, rated for 25,000+ cycles instead of 10,000. On heavy doors they're usually the cheaper option per year of life.

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