Start with what you heard and saw
The clue is often in the sound. A loud bang like a firecracker usually means a spring snapped. A grinding noise points to the opener gear or a roller. The opener running while the door doesn't move usually means a broken spring or cable. No sound at all points to power or a remote issue.
The 7 most common causes
Run through these from most to least common before calling a tech:
- Broken torsion spring — the #1 cause; the opener can't lift the door without it
- Misaligned safety sensors — a 5-minute fix; check for a blinking sensor LED near the floor
- Dead remote or keypad battery — try the wall button to isolate it
- Opener lock / vacation mode engaged — check the wall console for a lock light
- Power loss to the opener — test the outlet and the breaker
- Snapped cable — the door may hang crooked or be stuck at an angle
- Worn drive gear or failed logic board inside the opener
What you can safely check yourself
Safe DIY checks: confirm the opener has power, swap the remote battery, wipe and realign the photo-eye sensors until both LEDs are solid, and make sure the wall-console lock isn't on. These resolve a surprising share of 'broken' doors.
What to leave alone: anything involving the springs or cables. Those hold hundreds of pounds of stored tension and cause serious injuries every year. If the door won't open and you suspect a spring, pull the emergency-release cord, leave the door closed, and call a highly-trained tech.
When to call for same-day service
If the door is stuck closed and your car is trapped, a spring or cable has failed, or the door is hanging crooked, call for same-day dispatch. Across Oro Valley, Marana, and NW Tucson we carry standard and high-cycle springs on every truck, so most spring jobs are finished in one visit.