A door that stops a foot off the floor, or touches down and then climbs right back up, is trying to tell you something. Openers built since 1993 are required to reverse when they sense an obstruction, so most of the time the door is doing its job with bad information. The trick is figuring out which sensor or setting is feeding it that information. Here are the seven causes we find in Carrollton garages, ranked from most to least common.
1. The photo eyes are blocked, dirty or out of line
Photo eyes cause most doors that will not close. The two small sensors sit on the tracks within 6 inches of the floor and shoot an invisible beam across the opening. Break that beam, even with a cobweb or a leaf blower cord, and the opener either will not start down or reverses the moment it does.
Look at the little lights on each sensor. On most brands one is a steady sending light and the other is a receiving light that glows solid when the beam is aligned and blinks or goes dark when it is not. Wipe both lenses with a soft cloth, clear anything on the floor between them, and gently nudge the bracket that is blinking until the light steadies.
West-facing garages get a bonus problem in late afternoon: low sun shining straight into the receiving eye can wash out the beam. A short piece of pipe or a cardboard shade over the sensor lens fixes that for good. If the lights will not steady no matter how you aim them, a wire has probably been nicked by a shovel or chewed by a rodent, and that is a quick fix on an opener service call.
2. Something is in the track or under the door
The second most common cause is physical. A pebble in the track, a bent track lip from a bumped bin, a stiff bottom seal packed with mud, or a hinge that has worked loose all create resistance partway down. The opener feels the extra load, assumes it hit a person, and reverses.
With the door closed as far as it will go, look along both vertical tracks with a flashlight. You are looking for anything that would catch a roller. Also run your hand along the bottom rubber seal: if it has gone stiff or is holding a bulge of dirt, the door may be touching down early on one side and reading that as an obstruction.
Wipe the track down with a damp rag, but do not grease it. Rollers are supposed to roll on a dry track; lubricant just collects grit. The bearings inside the rollers and the hinge pins are where the silicone spray goes.
3. The close travel limit has drifted
Every opener has a setting for how far down "closed" is. Set a little short, the door stops 2 or 3 inches above the floor and sits there. Set too far, the door presses into the concrete, feels resistance, and reverses. On chain drives from the 1990s the limit is a screw on the motor housing that drifts over time.
Adjusting travel limits is one of the few opener jobs a careful homeowner can do, and your model's label or manual shows where the adjuster is. Move it in small steps and run a full cycle after each. Then do the safety reversal test described in our monthly safety check guide, because a changed limit changes how hard the door lands.
On newer units with automatic limits, a door that suddenly stops short usually means the opener has lost its programming after a power outage or the door itself got heavier, which leads to the next two causes.
4. The force setting is losing to a stiff door
Openers also have a force limit, the amount of push they will apply before deciding something is wrong. If the door has grown harder to move because of dry rollers, a rusted hinge or a spring losing tension, the motor hits that force limit before the door reaches the floor and reverses.
The wrong fix is to crank the force up until the door closes. That defeats the protection that keeps a child or a car bumper from being crushed, and it masks the real problem. The right fix is to find out why the door is stiff. Pull the release cord with the door closed and lift it by hand: a balanced door should glide up and stay wherever you leave it. If it feels like dead weight or drops on its own, stop here and call. If it is just gritty and sticky, lubricating the rollers, hinges and springs often restores a smooth close.
5. Worn rollers or tracks that are no longer parallel
A sectional door needs both vertical tracks plumb and the same distance apart. Carrollton sits on Blackland Prairie clay that expands after wet spells and contracts through droughts, and thousands of local slabs have shifted enough over 40 years to tip a track a quarter inch, so the door rubs or gaps at one corner.
Cracked nylon rollers and flat-spotted steel ones do the same thing on a smaller scale. Watch the door close and listen: a scraping or popping sound on one side near the bottom points to a roller or a track bracket rather than a sensor. Bent track and loose lag bolts are common on the older streets off Keller Springs Road, where the hardware is original and the soil has had forty years to work on the foundation.
Track alignment and roller replacement are quick professional jobs and usually fall in the $125 to $300 range for track and roller repair. If the opening itself has racked badly, a foundation contractor may need to look at the slab before the door will ever seal properly.
Tried the easy fixes and it still stops short?
Tell us where it stops and what it sounds like. We can usually name the cause on the phone and fix it the same day.
6. A spring or cable is failing
When a torsion spring is weak or one of a pair has broken, the door is heavier than the opener expects. It may close fine, because gravity helps, but stop short when the force limit trips on the way down, or the door may slam the last foot. A frayed lift cable causes a different pattern: one side of the door drops faster than the other, the door cocks in the opening, and a roller binds.
These are not adjustments. Springs and cables hold the door's full weight under tension and are replaced with winding bars and the door clamped in place. If a cable has jumped its drum, cable replacement and re-tensioning is the fix. If you want to understand why the spring gave out in the first place, why springs break in North Texas heat covers cycle life and the local factors that shorten it.
7. The opener itself: lock mode, logic board or a bad remote
Last on the list because it is least common, but worth checking before you call. Many wall consoles have a lock or vacation button that disables remotes; if the wall button closes the door and the remote does not, that is the answer. A remote with a weak battery can send a partial signal that starts the door and then drops out.
If the door closes only while you hold the wall button down, the opener is telling you the photo eyes are not communicating, which sends you back to cause number one. If the opener light flashes a number of times after the door reverses, that count is an error code; the model label lists what each count means. And if the motor hums, clicks or does nothing at all, the logic board or capacitor may be failing, which is common on units that have baked through fifteen or twenty Carrollton summers. Our guide to garage door opener noises matches those sounds to their causes.
Quick diagnosis by what the door does
| What the door does | Most likely cause | Safe to check yourself? |
|---|---|---|
| Starts down, reverses immediately, light flashes | Photo eyes blocked or misaligned | Yes: clean and realign sensors |
| Closes only while wall button is held | Photo eye wiring or alignment fault | Yes to look; call if lights will not steady |
| Stops 2 to 4 inches above the floor, no reverse | Close travel limit set short | Yes: small limit adjustments |
| Touches floor, then reopens | Limit set too far, or stiff bottom seal | Yes: adjust limit, clean seal |
| Reverses at the same spot every time | Debris, bent track or bad roller at that height | Yes to inspect; call for bent track |
| Closes crooked or gaps at one corner | Cable, roller or track out of parallel | No: stop cycling and call |
| Feels heavy by hand, opener strains | Weak or broken spring | No: leave closed and call |
| Remote does nothing, wall button works | Lock mode or dead remote battery | Yes |
One more thing worth knowing: a garage door that will not close is a security problem as much as a mechanical one, and it is why we treat these calls as urgent across all of our Carrollton service area, from the older blocks near the DART Green Line stations to the newest streets in the north. If it is late and the door is stuck open, our Carrollton garage door repair line stays open all night.
Questions about a door that won't close
Why does my garage door close a few inches and then go back up?
Nine times out of ten the photo eyes are the reason. Something is breaking the beam or the two sensors are no longer pointed at each other. Clean the lenses, clear the floor between them and adjust the blinking sensor until its light holds steady. If that fails, look for a pinched or chewed sensor wire.
Can I close the door by holding the wall button down?
You can, and on most openers the door will close while the button is held, because that bypasses the photo eyes. It is meant as a temporary way to secure the house, not a fix. The sensors are disabled during that close, so keep people and pets clear and get the sensors repaired promptly.
Why does my garage door leave a gap on one side when closed?
A gap at one bottom corner usually means the tracks are no longer parallel or the door is racked in the opening. In Carrollton that often traces back to slab movement on clay soil, a loose track bracket or a stretched cable on one side. A technician can re-plumb the tracks and re-tension the cables in a single visit.
How much does it cost to fix a garage door that won't close?
Sensor realignment or a travel limit adjustment usually falls under a basic service visit, in the $89 to $150 range in Carrollton. Sensor replacement, roller replacement or track work typically runs $125 to $300. A broken spring is a separate repair in the $150 to $350 range. Every quote is confirmed on-site before work starts.
Is a garage door that reverses on its own dangerous?
The reversing itself is the safety system working. What can be dangerous is the reason behind it, such as a failing spring or a cable about to let go. If the door reverses because of a sensor, it is an annoyance. If it reverses because it feels heavy, stop using it until a technician has checked the springs.