How to Fix a Garage Door: Troubleshooting 8 Common Problems (2026)

Frequently Asked Questions

Why won't my garage door open with the remote?

Check these in order: (1) Dead remote battery — replace it first, takes 30 seconds. (2) Opener is unplugged or tripped GFCI outlet — check the outlet with another device. (3) Safety sensors out of alignment — look for a blinking LED on one or both sensor units at the bottom of the door tracks. Realign so the LEDs glow steady (green on receiver, amber/red on sender). (4) Signal interference — walk closer to the opener. (5) Remote frequency conflict — reprogram the remote per the opener manual.

What are the safety sensors on a garage door?

Safety sensors are two small units mounted 4–6 inches above the floor on each side of the garage door track. One emits an infrared beam, the other receives it. When anything breaks the beam while the door is closing, the door stops and reverses. When they're working: the receiving sensor glows green, the sending sensor glows amber or red. When misaligned: one or both blink. The door will not close if the beam is broken or the sensors are out of alignment.

Can I replace a garage door torsion spring myself?

Technically yes, but it's one of the most dangerous DIY repairs. Torsion springs are wound to hundreds of foot-pounds of tension. If a spring or winding bar slips during installation, it can cause serious injury. Most manufacturers void the warranty on DIY spring replacement. The cost to have a pro replace both springs is $150–$350 — given the injury risk, this is money well spent. DO NOT attempt spring replacement without proper winding bars and training.

How do I get my garage door open if the spring is broken?

Pull the red emergency release cord (the rope hanging from the trolley/carriage). This disengages the door from the opener drive. You can now lift the door manually. A door with a broken torsion spring will feel extremely heavy — it normally weighs 150–250 lbs and the spring counterbalances most of that. With a broken spring, you're lifting the full weight. If you can't lift it safely, leave it and call a garage door company.

Why is my garage door opening but not closing?

The most common cause is misaligned safety sensors — the beam is broken and the door won't complete the close cycle. Check that both sensor LEDs are glowing steady (not blinking). Clear any cobwebs, leaves, or objects from in front of the sensors. Also check: the close limit switch (set too low), something physically blocking the door's path, or a remote button held too long (auto-reverse).

Most garage door problems are caused by one of 5 things: dead remote battery, misaligned safety sensors, limit switch settings off, broken torsion spring, or a track obstruction. Dead battery and sensor alignment you can fix in 2 minutes each.

Most garage door problems are surprisingly easy to diagnose and fix. Here are the 8 most common issues.

---

Problem 1: Remote doesn’t work

Check first: Replace the battery. CR2032 or 9V depending on the remote — most remotes will blink or feel sluggish before dying completely.

If new battery doesn’t fix it:

1. Test the wall button — if the wall button works, the problem is the remote. Reprogram it: hold the “Learn” button on the opener motor unit (mounted on ceiling) until the LED blinks, then press and hold the remote button within 30 seconds until the opener lights flash.
2. If the wall button also doesn’t work: check the outlet. Plug a phone charger into the same outlet to confirm power. Check if it’s a GFCI outlet with a tripped reset button.
3. If the opener motor runs but the door doesn’t move: see Problem 4 (trolley disconnected).

---

Problem 2: Door won’t close — sensors blinking

The sensors are misaligned. Both sensors should glow steadily — green on the receiver (stationary LED), amber/red on the sender.

Fix:

1. Loosen the wing nut or screw on the sensor bracket slightly.
2. Manually reposition the sensor until both LEDs glow steady (not blinking).
3. Retighten the bracket.
4. Test by using the wall button.

If the LEDs are steady but the door still won’t close: something is blocking the beam path. Check for a cobweb, leaf, or object between the sensors. Also check that the sun isn’t shining directly into the receiving sensor (morning or afternoon sun can interfere — add a cardboard visor over the sensor).

If sensors are fine: Check that the open/close limit settings aren’t set too low — see Problem 5.

---

Problem 3: Door reverses before closing all the way

Two causes: The close-force setting or the close-limit setting.

Close-limit too low: The opener “thinks” it’s hitting the ground before it actually does, so it reverses. Adjust the close-limit screw (usually a small dial or screw on the back or side of the opener motor unit, labeled “Down” or “Close Limit”). Turn in small increments and test after each.

Close-force too low: If the door is meeting resistance (cold, stiff weatherstripping, slightly warped frame) and the force setting is low, the opener reads it as an obstruction and reverses. Adjust the down-force setting (same area as the limit screws, labeled “Force” or “Down Force”). Increase by small increments — do not over-tighten; the auto-reverse safety depends on this setting being calibrated correctly.

---

Problem 4: Motor runs but door doesn’t move

The trolley is disconnected from the door. When someone pulls the red emergency release cord, the trolley disconnects.

Fix: With the door fully closed, pull the red cord toward the opener (not down) — this re-engages the trolley carriage. You should hear a click. Then run the opener normally.

If the trolley won’t re-engage, the spring may be broken. A door with a broken spring will sag and the trolley won’t re-engage properly.

---

Problem 5: Door is noisy — grinding, rattling, or squeaking

Noise	Cause	Fix
Squeaking / grinding	Dry rollers or hinges	Lubricate with white lithium grease (NOT WD-40)
Rattling	Loose hardware	Tighten all hinge bolts, roller brackets, track bolts
Banging at open/close	Limit adjustment or springs	Check limits; call pro for spring tension
Rumbling from opener	Chain or belt wear	Adjust chain tension; lubricate chain

Lubricate these points (spray with white lithium grease):

• Roller stems (the metal shaft, not the nylon wheel)
• Hinge pivot points
• Torsion spring (both ends)
• Top of the door track curves (not the vertical sections)
• Opener chain or screw drive (if chain/screw type)

Do NOT lubricate the track itself — that makes rollers slip and is unnecessary.

---

Problem 6: Door is off-track

A door off its track is caused by an obstruction hit while closing, a broken roller, or a damaged track.

Do not try to run the opener with the door off-track.

1. Disconnect the opener (pull emergency cord).
2. Manually lift the door until the rollers are near the track opening.
3. If a roller has popped out: use pliers to bend the track lip slightly outward, guide the roller back in, then bend the lip back.
4. Inspect the track for dents or bends. A minor dent can be tapped out with a rubber mallet. A severely damaged track section needs replacement (same track width and gauge).
5. Check all rollers — replace any with worn or cracked wheels with replacement rollers.

---

Problem 7: Door won’t open in cold weather

Cold contracts metal and makes the bottom seal stick to the floor (especially if water froze it shut).

1. Don’t force it with the opener — you can strip the trolley or bend the track.
2. Manually break the seal by pushing along the bottom of the door with your hand.
3. Check for ice between the door panels or in the track.
4. Apply silicone door bottom seal lubricant to the rubber bottom seal to prevent future freezing.
5. If the opener still won’t pull the door, the cold-start limit adjustment may need a slight increase — the door needs more force to open in cold temperatures.

---

Problem 8: Broken torsion spring — call a pro

Torsion springs are the large horizontal spring(s) mounted above the door on a metal bar. Extension springs are the long springs running along the horizontal tracks on each side.

Signs of a broken spring:

• Loud bang from the garage (the spring snapping)
• Door feels extremely heavy when manually lifted
• A visible gap or kink in the torsion spring coil
• Door opens only a few inches and strains

DO NOT attempt torsion spring replacement without proper training and winding bars. The spring is wound to several hundred foot-pounds of tension. A slip during installation sends the winding bar flying.

Call a garage door company. Average cost for spring replacement: $150–$350 for both springs. Budget for both springs at once — if one breaks, the other is at similar wear.

---

Related guides

• Best Garage Door Openers — upgrade when it’s time to replace the opener
• Cost to Replace a Garage Door — when repair turns into replacement
• How to Install a Garage Door Opener — DIY opener installation
• How Much Does a Garage Door Replacement Cost — full pricing guide
• Handyman Cost Guide — what to expect for spring replacement
• Garage Door Repair Cost — professional repair costs when DIY isn’t the right call; $100–$600 by problem type
• How to Fix a Broken Garage Door Lock — repair or replace the door lock mechanism if it won’t engage or release