Is the Opener Running or Completely Dead?
The fastest diagnosis: press the wall button. One of two things happens and each points to a completely different problem set.
You hear the opener. The trolley moves along the rail. The door doesn't go with it.
→ Mechanical door problem: broken spring, broken cable, or disconnected from opener
No sound, no light, nothing happens on remote or wall button.
→ Power or electrical problem: dead remote, tripped breaker, opener failure
Motor Runs But Door Won't Move
1. Broken Torsion Spring
The most common cause. Springs provide the counterbalance that lets the motor lift the door — without them, a 200–400 lb door is too heavy for the opener motor. Look above the door for a gap in the horizontal spring coil or a spring hanging loose. If you heard a loud bang before the problem started, this is it.
2. Broken Lift Cable
Cables run from the bottom corners of the door up to drums on the torsion bar. A snapped cable leaves the door sagging on one side or completely unable to lift. You'll often see the door sitting crooked. Professional repair required — the cables are under spring tension.
3. Door Disconnected from Opener
If the red emergency release cord was pulled, the door is no longer connected to the trolley. The motor runs, nothing happens. Fix: manually open the door fully, then pull the cord back toward the door until it clicks, or press the remote — it re-engages on the next cycle.
4. Door Off the Track
A roller that's jumped the track will jam the door. See the full off-track guide →
Opener Completely Dead
1. Dead Remote Battery
Try the wall button. If it works, the remote battery is dead. Replace it — CR2032 coin battery on most current models — before troubleshooting anything else.
2. No Power
Check the outlet (plug something else in), check the breaker, check any wall switch controlling the outlet. Vibration can work the opener's plug loose over time.
3. Safety Sensor Issue
Misaligned or blocked sensors can prevent operation. Check for solid lights on both sensors — one green, one amber. Blinking = problem. Sensor light guide →
4. Lock Mode Active
LiftMaster and Chamberlain openers have a lock mode that disables remotes. If the wall button works but remotes don't, hold the wall button for 6 seconds to toggle lock mode off.
5. Opener Motor Failure
Openers older than 15 years that suddenly stop responding may have a failed motor or logic board. At that age, replacement often makes more sense than repair. Modern openers with WiFi and battery backup start around $200.
| Problem | DIY? | Pro Cost | Urgency |
|---|---|---|---|
| Dead remote battery | Yes — $5 | — | Low |
| Door disconnected from opener | Yes — free | — | Low |
| Tripped breaker / no power | Yes — free | — | Low |
| Sensor misalignment | Yes — free | — | Low |
| Broken torsion spring | No — call pro | $150–$350 | Urgent |
| Broken cable | No — call pro | $120–$200 | Urgent |
| Door off the track | No — call pro | $125–$175 | Urgent |
| Opener motor failure | Partial | $250–$500 | Medium |
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