Published 2026-05-19 · Madison Garage Door Pros

Garage Door Won't Close? Why It Reverses and How to Fix It

Quick answer: A garage door that starts down and reverses, or won't close at all, is usually a safety-sensor problem, not a broken motor. The two photo-eyes near the floor have either been bumped out of alignment, gotten dirty or wet, or had the beam blocked by something small. Cleaning the lenses and re-aiming the two eyes at each other fixes most of these in five minutes. If the door also drags, binds, or won't move on the hold-to-close override, the cause is hardware: a worn cable, a one-sided spring, or a track problem. A sensor or limit adjustment in the Madison area runs roughly $89 to $180, and we hold same-day slots because a door stuck open is a security problem.

The two ways a door "won't close"

Almost every won't-close call falls into one of two buckets, and telling them apart at the start saves you time and money.

The first bucket is the door that tries to close. You press the button, the door starts down, and somewhere in the first foot or two it stops and rolls back up. The opener light might blink a set number of times after it reverses. This is the safety system doing its job, and the fix is on the sensors or the close-force setting, not the door itself.

The second bucket is the door that won't move toward closing at all, or moves and then jams. You press the button and you get a click and nothing, or the door starts down and drags, scrapes, or stops dead against something. That points away from the sensors and toward the hardware: a cable, a spring, a roller, or a bent track. If your door is in this second bucket, the opener diagnosis walkthrough and the off-track guide are better starting points than this one.

For the rest of this article we'll focus on the first bucket, the reversing door, because it's the most common won't-close call we get and the one you have the best shot at fixing yourself.

Why your door reverses: the photo-eye system

Since 1993, every garage door opener sold in the United States has been required to have a photo-eye safety reverse. Two small sensors sit about six inches off the floor, one on each side of the door, bolted to the vertical track or the wall. One sends an infrared beam, the other receives it. When that beam is unbroken, the opener knows the path is clear and lets the door close. When the beam is broken, or when the two eyes lose sight of each other, the opener refuses to close and sends the door back up.

That design is deliberately twitchy, because the thing it's protecting against is a closing door coming down on a child or a pet. The downside is that a lot of harmless things can trip it: a coiled hose leaning against one sensor, a stray leaf, a spider web across the lens, a bike tire parked in the beam, or one eye simply knocked a few degrees off aim by a bag of mulch sliding into it. Any of those reads as a blockage, and the door reverses.

The good news is that the same twitchiness means the fix is usually small. You're not repairing a motor. You're getting two little eyes to see each other again.

The five-minute fix to try first

Before you call anyone, walk through these steps in order. They clear the large majority of reversing-door calls.

1. Look at the path. Stand inside and look across the bottom of the opening at sensor height. Clear anything in the way: trash cans, the recycling bin, a garden hose, sports gear, the kids' scooters. Even a thin object that crosses the beam counts.

2. Check the LED on each sensor. Each eye has a small light. On most brands, both should glow steady when the beam is aligned. If one is dark or blinking, that's your culprit. Note which side it is.

3. Wipe both lenses. Use a soft dry cloth. In a Wisconsin garage, the lenses pick up dust, cobwebs, road salt film in winter, and condensation in the shoulder seasons. A wet or filmed lens scatters the beam and reads as blocked. This one step fixes a surprising number of calls.

4. Re-aim the eyes. The sensors are usually held by a wing nut or a small bracket that lets them pivot. Gently nudge the eye with the dark or blinking light until its LED goes steady. You're aiming it straight at its partner across the opening. When both lights are steady, the beam is connected.

5. Test a close. Press the button and watch. If the door now closes all the way, you're done. If it still reverses, hold the wall button down through the whole travel. If holding it closes the door, the sensors or the wiring are still the issue and it's worth a service call. If even holding it won't close the door, you're in the hardware bucket and the cause is mechanical.

When it isn't the sensors

If you've cleaned and re-aimed the eyes and the door still won't close on its own, a handful of other causes are in play. These are the ones we check on a service call.

Sensor wiring. The thin two-conductor wire that runs from each eye up to the opener can get pinched, nicked by a staple, or chewed by a mouse over a Wisconsin winter. A broken or shorted wire reads the same as a blocked beam. We trace and test the runs with a meter, which is faster than guessing.

Sun glare. Low afternoon sun pointing straight into a west- or south-facing sensor can overwhelm the receiver and read as a blockage. The tell is that the door closes fine in the morning and refuses in the late afternoon. A small shield over the eye, or a few degrees of rotation, clears it. We see these mostly in spring and fall when the sun sits low. There's more on this in the photo-eye alignment guide.

Close-force or travel-limit settings. Every opener has an adjustment for how far the door travels and how much force it uses. If the down-limit is set so the door hits the floor early and then thinks it has hit an obstruction, it reverses. Cold weather can shift this, because the door and tracks contract and the door seats differently. Re-setting the limits takes a few minutes and a screwdriver, and it's a common fix in January.

A binding door. If a roller is dragging, a hinge is catching, or a track is slightly out of plumb, the opener feels the extra resistance on the way down and reverses to protect itself, reading the drag as an obstruction. This one overlaps with the hardware bucket, and it's worth a look at the rollers and track if everything else checks out.

A one-sided spring or cable. If a torsion spring is failing or a cable is fraying on one side, the door can come down unevenly, bind, and reverse. That's not a sensor problem and it's not a do-it-yourself fix. If you suspect it, read what to do about a broken spring and keep the door closed until it's looked at.

Why you shouldn't just disable the sensors

It's tempting, when a door keeps reversing, to bypass the sensors entirely by jumping the wires or taping the eyes to face each other at close range. We get asked about it. Please don't make it permanent.

The photo-eye reverse is the one system on the door that's there specifically to keep a closing door from coming down on something soft. Bypass it and the door will close on whatever is in the way, including a kid chasing a ball or a dog that wandered under it. The hold-to-close override exists for exactly the one-night situation where you need the door shut and can watch it the whole way down. That's different from rewiring the safety out of the system for good. Fix the eyes; don't delete them.

What a service call actually involves

When we come out for a won't-close door, the visit is a sequence of checks rather than a single swap. The $89 diagnostic applies to the repair if you proceed.

We start at the sensors: clean both lenses, check both LEDs, re-aim each eye, and meter the wiring back to the opener for breaks or shorts. Most reversing doors are solved at this step, and a sensor realignment or a wiring repair lands in the roughly $89 to $180 range depending on whether we're replacing a damaged sensor or just re-aiming and re-terminating a wire.

If the sensors test clean, we move to the opener's travel and force settings and reset the down-limit so the door seats without faulting. Then we cycle the door several times by hand with the trolley released, feeling for any bind, drag, or uneven travel that would make the opener reverse. If we find a dragging roller or a track out of plumb, we fix it on the spot, and that work falls in with normal roller or track service rather than a sensor charge.

If the reverse turns out to be a failing spring or a one-sided cable, we quote that separately and walk you through it before any wrench comes out. We never start the bigger repair without a firm price in hand.

Real Madison won't-close calls this season

A Sun Prairie homeowner called in April about a door that closed every morning but reversed every afternoon. Both sensors tested fine on the meter. The cause was the spring sun coming straight down the driveway into the west-side eye around 5 p.m. We added a short shield over that sensor, rotated it two degrees, and the afternoon reverses stopped. The visit was around $95.

A Fitchburg client had a door that started reversing in early March after a cold snap. The sensors were clean and aligned. The down-travel limit had drifted as the door and tracks contracted in the cold, so the door was bottoming out early and reading it as an obstruction. We reset the limits, cycled it a dozen times to confirm, and the door has closed cleanly since. That one ran about $110. The same cold-weather pattern shows up in the cold-snap troubleshooting guide.

A Middleton homeowner had cleaned and re-aimed the eyes twice with no luck. When we metered the sensor wire, the run on the right side had been nicked by a drywall screw during a garage finishing project the year before, and winter humidity had finally corroded it through. We re-ran a clean length of sensor wire, re-terminated both ends, and the door closed on the first try. The repair was around $150.

The takeaway

A garage door that reverses or won't close is, far more often than not, a small sensor problem wearing a scary costume. Clear the path, wipe the lenses, re-aim the two eyes until both lights hold steady, and test a close. That sequence fixes most reversing doors in five minutes for zero dollars. If the door still won't close on its own, or if it binds and drags on the hold-to-close override, the cause is in the hardware and it's worth a same-day look before the door spends another night stuck open.

Frequently asked

Why does my garage door go down a foot then go back up?

That reverse is the safety system working. Two photo-eye sensors sit about six inches off the floor on each side of the door, and they shoot an invisible beam across the opening. If anything breaks that beam, or if the two eyes are no longer pointed at each other, the opener assumes something is in the way and sends the door back up. A door that reverses right after it starts down is almost always a sensor problem, not a motor problem.

How do I know if it's the sensors or something worse?

Look at the small LED on each sensor. Most brands show a steady light on both when the beam is aligned, and a blinking or dark light on one when it's blocked or knocked out of aim. If you can close the door by holding the wall button down the whole way (many openers let you override the sensors this way), the problem is the sensors, not the door hardware. If the door binds, drags, or won't move even on the override, that points to a track, cable, or spring issue instead.

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

On most openers you can force a close by pressing and holding the wall button until the door is all the way down. Let go early and it stops or reverses. This is fine as a one-time fix to get the door shut for the night, but never leave a door on permanent override, because the safety reverse is what stops a closing door on a pet, a child, or a bumper. Get the sensors fixed rather than living on the hold-to-close trick.

Why won't my door close in bright afternoon sun?

Low sun coming straight into a west-facing or south-facing sensor can wash out the beam and read as a blockage. We see a wave of these calls in Madison in late afternoon during spring and fall when the sun angle is low. A small sun shield over the sensor, or rotating the eye a few degrees, usually clears it. It's one of the few sensor issues that comes and goes by time of day, which is a strong clue.

The door closes fine with the wall button but not the remote. What gives?

If the wall button works and the remote doesn't, the door hardware and sensors are fine and the issue is the remote: a dead battery, a remote that's lost its programming, or a worn button contact. A fresh battery fixes most of these. If a new battery doesn't do it, the remote may need reprogramming to the opener, which takes a couple of minutes.

How fast can you get out if my door won't close and won't stay shut?

A door stuck open is a security and heat-loss problem, so we hold same-day slots for it. Most days we can be at a Madison-area address within two to four hours of your call. Verona, Middleton, Fitchburg, and Sun Prairie are all inside our same-day radius. If you can text a photo of the sensors and the opener model, we'll pre-stage the right parts on the truck.