Few things are more frustrating than a garage door that won’t close. You press the button, the door starts down and reverses, or it will not move at all — and now your home is wide open. The good news is that most causes are simple and fixable, and the single most common one takes two minutes to correct. This guide walks through every reason a garage door won’t close, from blocked safety sensors to broken springs, in the order you should check them, plus how to realign the sensors yourself and when to call a technician.

Start Here: Watch What the Door Does

Before you troubleshoot, notice the exact behavior, because it points straight to the cause:

• The door starts down and reverses back up — almost always the safety photo-eye sensors.
• The door will not move at all and the opener light blinks — usually a sensor or wiring fault the opener is reporting.
• The door will not respond to the remote but the wall button works — a remote, keypad, or antenna issue.
• The door is crooked, stuck, or extremely heavy — a spring, cable, or track problem.

Work through the checks below in order — they are arranged from most common and easiest to least common.

1. Blocked or Misaligned Photo-Eye Sensors

Since the early 1990s, every automatic garage door has two photo-eye sensors mounted about six inches off the floor on each side of the door. They shoot an invisible beam across the opening, and if anything breaks that beam — or if the two eyes are not pointed at each other — the opener refuses to close the door as a safety measure. This is by far the most common reason a garage door won’t close. Look at the small LED on each sensor: a steady light means they are aligned, and a blinking or off light means they are blocked or misaligned. Clean the lenses with a soft cloth, clear anything in the beam’s path, and make sure both sensors point straight at each other.

2. Something in the Door’s Path

The door’s own safety system also reverses if it hits an obstacle on the way down. A trash can, a garden hose, a stray tool, or even a build-up of leaves and ice at the base can trigger it. Walk the full width of the opening and clear the threshold, then try again.

3. Dirty, Bent, or Obstructed Tracks

If the rollers cannot travel smoothly, the door binds and the opener stops or reverses. Look along both vertical tracks for dents, bends, or debris, and check that the tracks are tight against the wall. Wipe the tracks clean and apply a garage-door lubricant to the rollers and hinges. Do not over-grease — a light coat is enough.

4. The Close-Limit Setting Is Off

Every opener has a close-limit setting that tells it how far to travel to reach the floor. If that setting is off — common after a power surge or on an aging opener — the opener thinks the door has hit the ground before it actually has, sees resistance, and reverses. On most openers there are small limit-adjustment screws or buttons on the motor unit. Turning the close-limit adjustment in small increments and testing between each change usually solves a door that reverses just before or just after touching the floor.

5. A Broken Torsion Spring

If the door is suddenly far too heavy, sits crooked, or the opener strains and gives up, you may have a broken spring rather than an opener problem. The springs — not the motor — carry the door’s weight, so a snapped spring leaves the opener unable to move the door. You will often hear a loud bang when a torsion spring breaks, and you may see a gap in the coil above the door. This is a repair for a technician; see our guide on how to replace a garage door spring and our same-day garage door spring replacement service.

6. Worn or Broken Lift Cables

The lift cables work with the springs to raise and lower the door. If a cable frays, snaps, or jumps off its drum, the door can hang crooked, bind in the track, and refuse to close evenly. Cables are under tension and pair closely with the springs, so cable problems are best handled by a professional along with a spring and balance check.

7. Remote, Keypad, or Logic-Board Issues

If the wall button closes the door but the remote or keypad will not, the problem is in the remote system, not the door. Try a fresh battery in the remote, reprogram it to the opener, and make sure the opener’s antenna hangs down freely. If neither the remote nor the wall button works and there is power, the opener’s logic board or capacitor may have failed.

8. The Door Closes Then Immediately Reverses

When a door goes all the way down and bounces right back up, it is almost always one of two things: the photo-eye sensors (check alignment first) or the close-force/limit settings telling the opener it has hit an obstruction. Rule out the sensors, then adjust the close limit a little at a time. If the door reverses only in cold weather, the seal may be freezing to the floor or the door may be contracting — a common seasonal quirk.

How to Realign Garage Door Sensors Step by Step

Because misaligned sensors cause most won’t-close problems, here is how to fix them:

1. Check the LEDs. Both sensors have a small light. A solid light on each means they are aligned; a blinking or dark light means they are not.
2. Clean the lenses. Wipe each lens gently with a soft, dry cloth to remove dust, cobwebs, or condensation.
3. Loosen and level the sensor. Loosen the wing nut on the bracket, then tilt and slide the sensor until the LED goes solid, aiming it straight at the opposite eye.
4. Check for the same height. Both sensors should sit at the same height, ideally within a quarter-inch, so the beam is level.
5. Tighten and test. Snug the wing nut without moving the sensor, then test the door. It should now close normally.

How to Manually Close a Garage Door

If you need to secure your home right now and the opener will not close the door, you can close it by hand safely — as long as the springs are intact:

1. Pull the manual-release cord. With the door fully open, pull the red release handle to disconnect the door from the opener trolley.
2. Lower the door slowly by hand. Keep your fingers away from the panel seams and guide the door down evenly. A balanced door lowers smoothly; if it feels heavy or drops fast, stop — a spring may be broken.
3. Lock the door. Use the manual slide lock if your door has one so it cannot be lifted from outside.
4. Re-engage when fixed. Once the opener issue is resolved, pull the cord toward the door and run the opener to relock the trolley.

Never force a door closed by hand if it feels extremely heavy — that is the sign of a broken spring, and the door can slam down.

Why Won’t My Garage Door Close With the Remote?

If the wall button closes the door but the remote will not, the door and opener are fine — the problem is the remote signal. Replace the remote battery, reprogram the remote to the opener with the Learn button, and make sure the opener’s hanging antenna wire is not tucked up or broken. If the remote works only up close, that is a weak battery or antenna issue rather than a door fault.

Quick Diagnostic Checklist

Run through this fast list before calling for service — it solves most won’t-close problems in a few minutes:

• Are both sensor LEDs solid (not blinking)? Clean and realign if not.
• Is anything — including ice, leaves, or a hose — in the door’s path or under the seal?
• Are the tracks clean, straight, and free of debris?
• Does the door reverse right at the floor? Adjust the close-limit setting.
• Is the door crooked or very heavy? Stop and check the springs and cables.
• Does the wall button work but not the remote? Replace the remote battery and reprogram it.

Preventing Garage Door Close Problems

A little upkeep prevents most close failures. Keep the photo-eye lenses clean and the brackets snug so a bumped sensor does not drift out of alignment. Vacuum the tracks and threshold so debris does not build up where the door meets the floor. Lubricate the rollers, hinges, and springs twice a year, and test the door’s balance by hand every few months — a balanced door puts less strain on the opener and its safety systems, so the close cycle stays reliable. Catching a worn spring or a loose sensor early is far cheaper than an emergency call with the door stuck open.

When to Call a Professional

Call a technician if the door is off its tracks or cables, if a spring has broken, if the opener has no power or a failed board, or if you have cleared the sensors and adjusted the limits and the door still won’t close. A pro diagnoses the exact fault, checks the springs, cables, tracks, and opener together, and gets the door closing safely — usually the same day. Our team handles this across the South Bay with fast garage door repair in Santa Clara, San Jose, opener repair, and 24/7 emergency service when the door is stuck open.