The Short Answer
Most of the time, a garage door that won't open comes down to one of three things: a power or control problem, a broken spring, or a cable that's slipped off the drum. A technician works through these in a specific order, cheapest and fastest checks first, because there's no point pulling a spring apart if the opener simply lost power. Here's that order, and what each fix actually involves.
What You're Probably Seeing
Before the causes, it helps to know which symptom you have, since it narrows things down fast:
- Door won't move at all, opener is silent. Usually power or the wall switch.
- Opener hums or clicks but the door doesn't move. Often a broken spring or a cable off the drum.
- Door opens partway then reverses or stops. Usually the safety sensors (photo eyes).
- Door is heavy, won't budge even by hand. Almost always a spring.
- Door moves crooked or binds on one side. Off-track or a track obstruction.
The Order a Technician Checks Things
1. Power to the opener
First check: is the opener plugged in, and is the outlet dead? Garage outlets are commonly on a GFCI circuit, and Florida humidity causes more nuisance trips than people expect. A tripped breaker or GFCI reset is a thirty-second fix and solves this more often than homeowners assume.
2. The wall control and remote
Dead remote batteries or a stuck wall button are next. If the wall switch works but the remote doesn't, it's a battery or reprogramming issue, not a mechanical one.
3. The safety sensors (photo eyes)
These are the two small sensors near the floor on each side of the track. If they're misaligned, dirty, or fogged, the opener will refuse to close the door and can act erratically on opening too. Afternoon downpours and condensation from humidity swings are common culprits here, along with a bump from a lawnmower or storm debris. The fix is realigning the sensors so their indicator lights are solid, then wiping the lenses clean.
4. The manual disconnect (red cord)
If someone pulled the emergency release cord, or it slipped loose during a storm power outage, the opener will run but the door won't move because it's disengaged from the trolley. Reconnecting it is simple, but it's often overlooked.
5. The springs
This is where a heavy, immovable door usually points. Torsion springs (above the door) or extension springs (along the upper tracks) store the tension that lifts the door's weight. A broken spring means the opener is trying to lift the full weight of the door alone, which it isn't built to do. You'll often hear a loud bang at the moment it breaks. Springs rust and fatigue faster in high-humidity climates, and repeated expansion from heat adds wear over a season of hurricane-season storms. This is not a DIY fix; springs are under heavy tension and a proper repair involves replacing both springs as a pair, since one is usually close behind.
6. The cables
Next, a technician checks the cables that run from the bottom brackets up to the drums. A cable that's frayed, snapped, or slipped off its drum will cause the door to hang crooked or drop on one side, and the opener will struggle or stop. Salt air exposure near the coast accelerates cable corrosion, so this is checked even on doors that look fine otherwise. The fix is re-seating or replacing the cable and inspecting the drum for wear.
7. The track and rollers
If the door binds, grinds, or moves unevenly, the tracks are checked for dents, misalignment, or obstructions. Humidity-driven swelling in wood-composite doors, or a track knocked loose by storm winds, can cause a door to catch partway. This is diagnosed as off-track repair, and depending on severity it ranges from realigning the track to replacing bent sections and rollers.
8. The opener motor and drive gear
Last on the list, because it's the least common cause: the opener's internal drive gear (often plastic, especially on older units) can strip over time, especially in units run hard through heat. If the motor runs but the trolley doesn't move along the rail, this is usually the problem. Depending on the opener's age and condition, it's either a gear replacement or a sign it's time for a new opener.
9. The manual lock
One more quick check: some doors have a manual slide-lock bolt that can get bumped into the locked position, especially on doors near a side entry. It looks identical to a spring or opener failure but the fix is just sliding the bolt back.
When to Call Greenville Garage Door Pro
If your door won't open and it's heavier than it should be, makes a loud bang, or the cables look frayed, stop trying to force it and call us. Broken springs and cable repair involve stored tension that can cause serious injury if handled without the right tools, and we carry springs rated for the wind-load and weight demands common on doors in this area. We also handle off-track door repair when storm debris or swelling has knocked things out of alignment, and we'll check sensor alignment and opener function at the same time so you're not calling back next week for a second issue.
If your garage door in Greenville, Madison, Monticello, Lee, Perry, Live Oak, Lamont, or Pinetta won't open, call Greenville Garage Door Pro. We show up on time and diagnose it properly, not just reset it and hope.