Updated 2026-06-20 · by David Yifrach, Owner, Seaside Garage Door Experts · Virginia DPOR Class A Contractor #2705188091

Why Your Garage Door Won't Close, and How to Fix It

A garage door that will not close almost always has a safety-sensor problem: the two photo eyes mounted near the floor are misaligned, dirty, or have a broken wire, so the opener refuses to finish closing and flashes its lights as a warning. The next most common causes are an engaged lock button on the wall console, a travel or force setting that makes the opener think the door already touched the floor, a bent track or seized roller binding the door, or a broken spring or cable the motor cannot move. This guide works through every cause in the order a technician checks them, decodes the blinking opener light patterns, and shows you how to get the door closed safely tonight.

Why it stops and reverses back up

Every garage door opener built since 1993 has a safety reversing system, and when a door starts down, hesitates, and rolls back up on its own, the opener was told to stop. Nine times out of ten that command came from the two photo-eye safety sensors mounted about six inches off the floor on each side of the door. They shoot an invisible infrared beam across the opening, and if anything breaks that beam, or if the opener cannot confirm the sensors are connected and aligned, it refuses to close so the door cannot come down on a child, a pet, or a car.

So the first thing to do is watch the opener when you press the close button. Note two things: does the door move at all, and does the overhead light or a status LED blink. There are only five buckets a non-closing door falls into, in order of how often we see them: a safety-sensor fault, an engaged lock button, a travel or force setting that is off, a mechanical bind in the track or a roller, and a broken spring or cable. The rest of this guide takes them in that order.

What the blinking opener lights mean

Most LiftMaster and Chamberlain openers tell you what is wrong by flashing the overhead light or a small LED in a repeating pattern. Learn to read it and you skip most of the guesswork.

• Continuous flashing, about 10 flashes: a safety-sensor problem. The sensors are blocked, misaligned, miswired, or failed. This is the most common pattern on a door that will not close.
• 1 flash: a sensor wire is broken or disconnected.
• 2 flashes: a sensor wire is shorted, pinched, or the black and white wires are reversed.
• 4 flashes: the sensors see each other but are slightly out of alignment, so the beam keeps breaking.
• 5 flashes: a motor or RPM sensor fault inside the opener head, which points to the logic board rather than the photo eyes.

Genie, Craftsman, and other brands use their own codes, so when in doubt check the label inside the opener cover or the manual for your exact model. The takeaway is simple: if the light blinks when you ask the door to close, start at the sensors.

How to fix the safety sensors (photo eyes)

This is the fix that solves most non-closing doors, and it usually takes ten minutes with no tools. Work through it in order.

1. Wipe both lenses. A film of dust, a cobweb, or condensation on either lens is enough to break the beam. Clean both with a soft, dry cloth.
2. Read the two LEDs. One sensor is the sender and usually shows a steady amber light. The other is the receiver and shows a steady green light when it sees the beam. If the receiver light is out, dim, or flickering, the beam is blocked or the sensors are misaligned.
3. Realign the receiver. Loosen the wing nut or bracket screw on the sensor with the bad light and tilt it slowly until the light glows steady, then tighten it without moving it. The two eyes must point straight at each other at the same height.
4. Clear the path and the floor. A trash can, a coiled hose, a stored bike, or even a low summer sunbeam shining straight into the receiver can break the beam. Move obstructions and check at different times of day.
5. Inspect the wires. Follow the thin sensor wires back toward the opener and look for staples driven through them, chew marks, kinks, or corroded splices. A nicked or corroded wire causes the same fault as a dirty lens.

If you clean and align both eyes and the receiver light still will not hold steady, the wiring or the sensor itself has failed and needs replacement. That is the point where a do-it-yourself fix usually ends and a service call begins.

Why it will not close when the sensors look fine

If both sensor lights are solid, the path is clear, and the door still will not close, move to these.

The lock or vacation button is engaged. Most wall consoles have a lock button that disables remotes and sometimes the close function. Press and hold it for a few seconds to toggle it off. A blinking wall-button light often signals this lockout.

The travel limits are set wrong. The opener learns how far to travel to reach the floor. If the down-limit is set too far, the door reaches the floor, the opener keeps pushing, decides it hit an obstruction, and reverses. If it is set short, the door stops with a gap. Both are adjusted with small dials or a digital menu on the opener head.

The close-force is too sensitive. A force setting that is dialed too low reads the normal resistance of the door near the floor as an obstacle and reverses. Nudge it slightly, then test, and never set it so high that the door will not reverse on an actual obstruction.

The logic board has failed. If nothing else explains it, especially with a 5-flash code or an opener more than fifteen years old, the control board may be the cause and is a job for a technician.

When a broken spring or cable is the cause

A broken spring or cable stops a door from closing in a different way than the electronics do. A snapped torsion spring leaves the door heavy and out of balance, so it may close crooked, bind, or refuse to seat against the floor. A broken lift cable lets one side of the door drop, so it hangs at an angle and jams in the track. If your door looks crooked, hangs unevenly, will not move by hand, or you heard a loud bang from the garage, stop pressing the button. Forcing an opener against a broken spring or a jammed door damages the opener and the door, and the parts are under heavy tension. This is the one set of causes you should not try to muscle through.

Why it closes most of the way then reverses

A door that goes almost all the way down and then pops back up is the classic signature of a travel or force problem rather than the sensors, since the sensors usually stop it at the top of the cycle. Check three things. First, the down-travel limit, which may be set so the door bottoms out and the opener reads the stop as an obstruction. Second, the close-force, which may be too sensitive. Third, a physical drag near the floor: a worn bottom roller, a small bend in the lower track, debris in the track, or a bottom seal catching on an uneven slab. Clear and inspect the bottom few feet of track on both sides before you touch the limit screws.

Why it will not close in cold weather

In freezing weather a door can refuse to close because the rubber bottom seal has frozen to the slab, or because thickened grease in the rollers and hinges adds enough drag that the opener reads it as an obstruction and reverses. Free the seal from the ice, scrape the strip of slab under the door clear, and apply a lithium-based garage door lubricant to the rollers, hinges, and springs. Avoid using the opener to break a frozen seal loose, which can tear the seal or strip the opener gear.

How to close it when the sensors are broken

If you need the door shut tonight and the sensors have actually failed, most openers let you override the safety reversal with a constant-pressure close. Press and hold the hardwired wall button without letting go, and the door will travel all the way to the floor with the photo-eye check bypassed for that one cycle. A remote will not do this; it has to be the wall button.

Treat this as a temporary measure only. The override removes the safety stop, so never use it when children or pets are around, keep your eyes on the doorway the entire time the door is moving, and repair the sensors as soon as you can. The reversing system exists for a reason, and a door should not be left running without it.

What I see in Hampton Roads

On the coast, the failure I see most is not a dirty lens, it is the thin sensor wiring corroding where salt air reaches a staple or a splice, so a sensor that tested fine in the spring drops out by mid-summer with a 1-flash or 2-flash code. Humidity and spider season also coat the lenses faster here than inland, and near Oceana and the Norfolk naval bases radio interference can scramble a remote even though the wired close circuit is healthy. None of that changes the checklist above, it just means coastal homeowners should look at the wires, not only the lenses. You can read the local version of this fix in our Hampton Roads guide to a door that will not close.

When to call a professional

Call a technician when a sensor light stays dark after you have cleaned, realigned, and checked the wiring, which points to a dead sensor or a control board, when the door is crooked or you heard a bang, which points to a spring or cable, or when travel and force adjustments will not hold. As a rough national guide, sensor realignment is usually a free do-it-yourself fix, a replacement photo-eye set runs about $85 to $175 installed, a logic board runs about $150 to $350, and a spring or cable repair runs about $150 to $350. We cover the electronics on our opener repair page, the mechanical side on our track and roller repair page, and the towns we serve on our Virginia Beach service area page.

If you are in Hampton Roads and want this fixed by a licensed technician, call (757) 777-3330. If you are not, the steps above are what we walk customers through every week.

Frequently asked questions

Why is my garage door opener light blinking and the door won't close?

A blinking opener light, often about 10 flashes, means a safety-sensor fault: the two photo eyes near the floor are blocked, misaligned, miswired, or failed, so the opener will not close. Start by wiping both lenses and checking that the receiver light glows steady, then realign the sensors and inspect the wires.

How do I reset my garage door sensors?

Garage door sensors do not have a reset button. You fix them by cleaning both lenses, aligning the two eyes so the receiver light is steady, clearing anything breaking the beam, and checking the wiring. Unplugging the opener for 30 seconds and plugging it back in clears the control board, but the sensors themselves are fixed by alignment, not a reset.

Can I close my garage door if the sensors are broken?

Yes, for one cycle, by pressing and holding the hardwired wall button without letting go until the door is fully down, which overrides the safety reversal. A remote will not do this. Treat it as temporary, keep the doorway clear and watched the whole time, and repair the sensors quickly, because the override removes the safety stop.

Why does my garage door close then immediately open back up?

Either the safety sensors are breaking the beam, which usually stops it near the top, or the down-travel limit and close-force are set so the opener reaches the floor and reads the stop as an obstruction, which usually happens near the bottom. A worn roller, a bent lower track, or a seal catching on an uneven slab can cause the same bottom-of-travel reversal.

How much does it cost to fix a garage door that won't close?

Cleaning and realigning the photo eyes is usually a free do-it-yourself fix. If parts are needed, a replacement sensor set runs about $85 to $175 installed, a control board runs about $150 to $350, and a broken spring or cable runs about $150 to $350. Costs vary by region and door, so get a written quote before any work.

Why won't my garage door close in winter?

In freezing weather the rubber bottom seal can freeze to the slab, or stiffened grease in the rollers adds drag, and the opener reads either as an obstruction and reverses. Free the seal from the ice, clear the slab under the door, and lubricate the rollers, hinges, and springs with a lithium-based garage door lubricant.

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