If your garage door won't budge, the most common culprits are a broken spring, a snapped cable, a door that's off its track, a dead opener, or — when it opens but won't close — blocked or misaligned safety sensors. This guide walks you through what's likely wrong, what's safe to check yourself, and what needs a technician. When you're done, you'll know whether you're looking at a 20-minute fix or a part that's dangerous to touch.
Safety first: A garage door is the largest moving object in most homes, and the springs that lift it are under extreme tension. Never try to release or adjust a spring, cable, or bottom bracket yourself — those are the parts that cause the most serious injuries. When in doubt, stop and call (410) 770-9800.
What actually makes a garage door move?
A residential garage door doesn't run on the opener's muscle — it runs on a counterbalance system. Heavy-duty torsion or extension springs store energy and do almost all the lifting; the cables and drums transfer that force to the door; rollers guide the door along the tracks; and the opener just nudges the balanced door the last bit and holds it in place. When any one of those parts fails, the door can refuse to move — or move in a way that isn't safe.
Knowing that order helps you diagnose the problem: if the door is heavy and won't lift, suspect the springs/cables. If the door responds to nothing, suspect power or the opener. If it opens but reverses, suspect the safety sensors.
Why won't my garage door open at all?
Work through these from most to least common:
- Broken torsion spring. If you hear a loud "bang" like a firecracker from the garage and then the door won't lift (or the opener strains and stops), a spring almost certainly snapped. You may see a visible gap in the coiled spring above the door. This is the #1 cause and is not a DIY repair.
- Snapped or frayed cable. A broken lift cable lets one side of the door drop, leaving it crooked or jammed against the track.
- Opener has no power or a dead motor. Check that it's plugged in, the outlet has power (test with a lamp), and the GFCI breaker hasn't tripped. Replace the remote and wall-keypad batteries.
- Manual lock or vacation lock engaged. Side-mounted slide locks or the opener's "lock"/vacation button will stop everything. Disengage them.
- Disconnected from the opener. If someone pulled the red emergency-release cord, the trolley is disconnected and the motor runs without moving the door.
Why does my garage door open but not close?
When the door goes up fine but stops or reverses on the way down, the problem is almost always the photo-eye safety sensors near the floor (required on every opener since 1993 under UL 325):
- Misaligned sensors — a bumped bracket breaks the invisible beam. Most openers blink the wall button or opener lights to signal this.
- A blocked beam — a trash can, cobweb, leaf pile, or even bright sunlight hitting the lens.
- Dirty lenses — wipe them gently with a soft cloth.
- Damaged or chewed sensor wires.
If the sensors are clean, aligned (both LEDs solid), and unobstructed and the door still won't close, the opener's close-limit or force settings may need adjustment — a quick tune for a technician.
What are the warning signs that something is failing?
These mean "schedule service before it strands you":
- Loud bang, grinding, or popping during operation.
- The door is heavy to lift by hand (with the opener disconnected) or won't stay open halfway — a sign the springs are losing tension or out of balance.
- Jerky, uneven, or crooked movement, or a gap in a cable.
- The door slams down instead of lowering smoothly.
- Frayed cables, bent tracks, or cracked rollers you can see.
What can I safely check myself — and what should I leave alone?
Safe to check: power and outlet, remote/keypad batteries, that the lock isn't engaged, that the photo-eyes are clean and aligned, and whether anything is physically blocking the tracks. You can also test balance: with the door closed and the opener disconnected (red cord), lift the door halfway — a balanced door stays put.
Leave to a professional: anything involving springs, cables, the bottom brackets, or the drums. These hold the door's full weight under tension and can cause serious injury. This is also where a "quick online fix" goes wrong most often.
Proof: what we see in the field
Across our five Mid-Atlantic locations, broken springs and worn rollers are the repairs our technicians make most often — and in coastal areas like the Eastern Shore and eastern North Carolina, salt air accelerates rust on cables and hardware, so we often catch corrosion during a tune-up before it becomes a breakdown. Because we're a Clopay Master Authorized Dealer, Genie dealer, and LiftMaster Authorized Dealer, our trucks carry the springs, rollers, and opener parts for the brands we install, so most repairs are handled in a single visit. (First-party observation from First Choice Garage Doors service calls; reviewed by Tony Aguilar, Founder & Owner.)
What should I do next?
- It opens but won't close → try the photo-eye checks above first; if that doesn't solve it, book a repair or call (410) 770-9800.
- Heard a bang / door is stuck / a spring or cable looks broken → don't force it. Schedule garage door repair and we'll handle the high-tension parts safely.
- Not sure whether to repair or replace → read Repair or Replace Your Garage Door? before you decide.
- Got a quote that felt high or pushy → that's exactly what our Free Second Opinion is for.
New to the parts named above? See the Garage Door Glossary.