Before you start: safety
Both a broken spring and a broken cable put the door into a partial-failure state. If the door is currently up and stuck, do not walk under it. If it is closed and will not open, that is the safer state — leave it there while you diagnose.
The red release cord disengages the opener trolley. If the door is already up with a broken spring, releasing it drops the full weight — 150 to 400 pounds — under gravity. Vehicles, tools, hands, and pets do not survive that. Diagnose first, act after.
Look at the top of the door — the springs
Every residential garage door has one of two spring systems:
- Torsion springs. Long, tightly-wound springs mounted horizontally on a shaft above the door. Most doors installed in the last twenty years use these.
- Extension springs. Long springs running horizontally along each side, parallel to the tracks, above the horizontal rail. More common on older doors and single-car doors.
What a broken torsion spring looks like
Look up. If your torsion spring has broken, you will see a visible gap of two to four inches between two ends of the spring. It looks like someone took a chunk out of the middle. Sometimes the whole spring is unwound and hanging loose. The break is almost always obvious — you do not need a flashlight.
The sound at the moment of failure is usually a loud metallic bang, sometimes described by homeowners as sounding like a gunshot or a car backfiring. That bang is the spring uncoiling suddenly and slapping against the shaft.
What a broken extension spring looks like
An extension spring failure is usually easier to see — the spring separates into two pieces, and one piece usually falls to the floor near the door. Look on the floor first, then look at the springs running above the horizontal tracks. A missing spring or a spring hanging at a strange angle is the tell.
Look near the drums — the cables
At each end of the torsion shaft (or at the side of the door for extension-spring systems) there are cable drums — round grooved wheels with a steel cable wound around them. The cable runs from the drum down to a fixed bracket at the bottom of the door.
What a broken cable looks like
A snapped cable dangles. You will see one of these:
- A frayed or completely severed cable hanging loose from either the drum or the bottom bracket.
- The door hanging lopsided — higher on one side than the other, because one side is still supported and the other side dropped.
- The door crooked in the tracks, possibly stuck at an angle.
- A cable wrapped around itself or piled on the floor.
The sound of a snapping cable is different from a snapping spring — it is more of a whip crack than a bang. And unlike a spring break, a cable break tends to happen mid-cycle rather than at rest.
The behavioral test — very carefully
If nothing is obvious visually, watch what happens when you try to open the door with the opener:
The opener motor engages, strains audibly, and either the door does not move at all or it lifts an inch or two and then the motor stops or reverses. That is because the spring provides the lifting force — the opener only guides the door. Without the spring, the opener is trying to lift the full weight of the door alone, which it cannot do and is not designed to do.
The opener runs normally and the door begins to move, but it goes crooked in the tracks. One side lifts and the other does not, or the door binds and comes to a jerky stop. You will typically hear rubbing or scraping from the side where the cable failed.
Quick reference table
Broken spring
- Loud bang at the moment of failure
- Door will not move at all when you press the opener
- Opener strains, then reverses or stops
- Visible gap in the spring above the door
- Door feels extremely heavy if you try to lift it manually
Broken cable
- Whip-crack sound at the moment of failure
- Door moves but tilts or binds crookedly
- Opener runs normally
- Cable visibly dangling or missing
- One side of the door lower than the other
What each one costs to fix, roughly
Neither of these is a DIY repair. Spring winding requires specialized bars and a working knowledge of tension, and cable replacement requires unloading spring tension safely before touching the drums. Both jobs are on the shorter side for a professional visit — usually about an hour on site.
Pricing depends on door weight, spring size, and hardware condition. When we visit for a spring replacement, we replace springs in balanced pairs even if only one broke, because the second spring is at the same fatigue point and will fail within weeks or months. For cables, we replace the pair — both sides of the door — for the same reason.
Why you should not try either yourself
Torsion springs hold enough stored energy at rest to break bones or worse. YouTube videos exist showing homeowners doing spring replacement, and they usually leave out the part where the winding bar slips and puts the person in the hospital. Cable work is similar — the drums have to be unloaded safely before you touch them, and the wrong sequence lets the shaft spin freely with the cable ends whipping around.
If you have a stuck-open door or a stuck-closed door blocking your car, call for same-day dispatch. If you can wait until tomorrow, a standard next-day window is usually available. Either way, we quote the full price before parts come off the truck.
Call 630-703-0039 for a same-day window, or send the details through the schedule form. If you can send a photo of what you see, that helps us bring the right hardware on the first visit.