Garage door closes then opens again by itself

Bounce back

Why a door would reverse after it has already landed

A garage door opener has one job when the door is closing, which is to bring it down until it senses that it has arrived. It does that by counting the motor's travel against a stored closed position and by feeling how hard the door pushes back. If the opener decides that the resistance came from something other than the floor, it assumes a person, pet or object is in the way and it reverses the door to avoid crushing it.

That is exactly what you are seeing when the door settles on the concrete and then lifts. The opener has misread the landing. Either it thinks the door met an obstruction a moment too early, or it thinks the door met resistance it could not account for, or it was told that the floor is lower than it really is and the door hit the slab while the motor was still pushing.

This behavior is protective, not random. The reversal is the feature that keeps a closing door from injuring someone, so the goal is never to disable it. The goal is to find out why the opener believes it has hit something and then to correct that cause, which may be a setting, a bit of dirt, a worn part, or a door that has become heavier than the opener expects.

The two limits and the down force setting

Openers store two travel positions and apply a measured amount of force while the door is closing. If the closed limit is set slightly too far, the door reaches the floor and the motor keeps trying to move it, which the opener reads as resistance. If the closed limit is set too short, the door stops above the floor and the opener may reverse because it senses the door has not arrived where expected.

The down force setting controls how hard the door can push before the opener decides it has hit something. If it is set too low, the normal resistance of a weatherseal pressed against the floor can cross the threshold and trigger a reversal. If it is set too high, a door could press harder than is safe against a person or object, which is why this setting should never simply be turned up until the symptom disappears.

Houston conditions can nudge these settings out of balance. A garage floor that is slightly sloped toward a drain, a thick bottom seal that swells in humid weather, or a seal that has stiffened in summer heat can change how the door meets the slab. A door that bounced only on very damp mornings, or only in summer, is describing exactly that sort of sensitivity, and it is worth telling the technician.

Floor contact, the bottom seal and what the door lands on

The strip of rubber or vinyl along the bottom of the door is the first thing to touch the floor, and it matters more than most people think. A stiff, swollen, thick or newly replaced seal can make the door feel like it is landing on a pillow, and the opener may read that cushion as resistance. A seal that has curled or become folded under the door can create uneven contact.

The floor itself can also be a factor. A pile of debris, a leaf buildup, a patch of dried mud, a raised crack in the slab, or a pool of water with a ridge of silt can prevent the door from sitting fully flat. Check the line along the floor where the door lands, and keep it clear. A small lip of concrete or an added threshold strip can also confuse the opener's idea of where the floor is.

If you have recently had flooring, a new coating, a drain, or a threshold installed, mention that. A raised surface can shorten the door's travel in a way the opener was never taught, causing a reversal each time. For related seal issues, see our page on a torn or flattened bottom seal and the explanation of a door that stops short of the floor.

• Look along the landing line for leaves, grit, mud or small objects.
• Check whether the bottom seal looks swollen, curled, folded or newly stiff.
• Notice any threshold strip, coating or raised patch added to the floor.
• See whether the door lands evenly on both sides or one side first.
• Observe whether the bounce happens only in damp or hot weather.

Safety sensors that blink at the last moment

Sensors can cause this symptom too, although a sensor fault more often keeps the door from closing at all or makes it reverse before it reaches the floor. A beam that is borderline can be interrupted by a small vibration as the door lands, especially if the sensor brackets are attached to the same wall that the door shakes. The beam flickers, the opener sees an obstruction, and the door reverses.

A box that is slightly misaligned may work through most of the closing cycle and fail just as the door settles. A cracked mount or a loose wire can behave the same way, because the shake of the landing is enough to disturb it. In a garage where the door slams or lands heavily, the sensors take a small knock with every cycle, and over a season that repeated jolt is enough to loosen a bracket screw that was perfectly tight when the opener was installed. Watch the small lights on both sensors as the door comes down, and note whether either one blinks or flickers right at the end.

Our page on a safety sensor light that is blinking covers those light patterns in more detail, and the page on a door that reverses before it touches the floor describes the neighboring symptom, which has a different set of likely causes.

A door that has become heavier than the opener expects

Openers are tuned for a door that is well balanced by its springs. Over the years the springs lose strength, and the door gradually becomes heavier on the way down, too. A heavy door descends with more momentum and meets the floor harder, which can trigger a reversal even if the force setting has not changed. This is one of the common reasons that a long running door starts bouncing after years of normal use.

Other sources of extra weight include damp or swollen wood sections, a recent paint job, added insulation, an added window kit or a panel that has been repaired with a heavier piece. Each of these shifts the balance from what the springs were chosen to carry. The opener then spends more of its effort stopping the door, and the stop is rougher.

This is why technicians check balance before touching force settings. Raising down force to compensate for a heavy door treats the symptom and puts more strain on the motor and the parts. The real fix is to restore the balance. Our guide on how to check if your garage door is balanced explains why that is such an important step, and why the test itself needs a trained person.

Track, roller and hinge friction near the bottom

Resistance does not always come from the floor. A roller that is dragging in the lowest section of the track, a hinge that has seized, or a track that is bent slightly near the bottom can create a hitch just before the door lands. The opener feels the hitch, reads it as an obstruction and reverses.

Look at the bottom few feet of both tracks. They should be clean, straight and parallel. Notice any scraping, any place where the rollers seem to climb or jump, and any bright wear marks that show metal rubbing metal. Sticky buildup from old lubricant, dirt and humidity can make the roller travel unevenly.

These conditions tend to produce a variety of sounds that may show up before the bounce, such as a squeal, a knock, or a rough rolling noise. If you have heard any of those, say so. The pages on worn garage door rollers and rough travel and a door rubbing on the side jamb can help you describe the symptom in plain words.

Wall control, remotes and the stray command

Occasionally the door is not really bouncing because of a mechanical fault at all. A stuck wall button, a remote that is being pressed in a pocket or on a car visor, or a second remote with a stuck switch can send a second command just as the door lands. The opener obeys the new command and heads back up. The door looks like it changed its mind because, in a sense, something told it to.

A wall control that sticks, gets wet, or has a corroded contact may send a repeated signal. In a damp climate, a wall button near a garage door that gets wet in storms is a plausible suspect. If the bounce happens at random moments and not always at the end of closing, a stray command is more likely than a settings issue.

If you suspect this, ask each person in the household to keep remotes away from the door for a day, and see whether the bounce stops. A wall control that does not respond at all is the opposite problem, but the same wiring and contacts are involved, and the guide to opener wiring and wall control basics explains how those controls connect.

Telling a settings problem from a hardware problem

A useful way to sort this out is to ask when the bounce happens. If the door lands, sits for a fraction of a second and then lifts, the opener probably finished its closing travel and then received a reason to reverse, such as a sensor flicker, a stray signal or a force reading taken at the wrong moment. If the door lifts the moment it touches, the landing itself is the trigger, and the limits, the seal and the force are the first places to look. A technician will often watch several full cycles before touching anything, because one cycle can be misleading and the pattern across five or six tells a much clearer story.

Another clue is consistency. A bounce that happens every single time points to something fixed, like a limit position, a raised floor edge or a stiff seal. A bounce that happens now and then points to something variable, such as a sensor that is borderline, a remote being pressed, or a door whose balance shifts with temperature and damp. Keep a simple note of when it happens and what the weather was like, because patterns are very helpful on the phone.

Also pay attention to what the door does afterward. If it rises all the way up, it was likely a full reversal. If it rises a few inches and stops, the opener may have sensed trouble and cut power as a precaution. Whether the work light flashes, whether the wall control blinks or beeps, and how the door behaves on the very next press are all details that help narrow the cause without anyone needing to touch the springs, cables or brackets. Our guide on keeping a garage door service log at home suggests a simple way to track these observations over time.

What not to do, and why the safety reversal must stay

It is tempting to tape over a sensor, hold the button down, or crank the force setting up until the door finally stays shut. Please do not. The reversal that is bothering you is the same one that protects a child or pet who ducks under a closing door. Defeating it may make the symptom disappear, but it removes the one protection that is designed to stop a heavy door from hurting someone.

Also avoid bracing the door with a board, leaning on it, or forcing it down by hand. If the door feels unusually heavy or the bounce comes with a bang, a sag or a cable that looks loose, stop and keep everyone clear. Springs and cables hold high tension, and they are not parts a homeowner should adjust.

You can read about the testing of this safety function in our guide to testing your safety reversal features. It explains what a healthy reversal looks like and why a technician will check it again after any repair, whatever the cause of the bounce turned out to be.

What to tell the technician and how the visit works

Useful details include whether the door bounces every time or only sometimes, whether it lands on both sides together, whether the bounce is worse in hot or damp weather, whether anything changed in the garage floor or seal, and what the sensor lights do at the end of the cycle. Mention recent storms, outages, or new remotes as well.

When you call, you describe what the door is doing, the system is inspected on site, the options are discussed before work begins, and the finished work and normal operation are reviewed with you. For this symptom the inspection usually looks at the limits, the force, the balance, the seal and the floor contact, the sensors and the wall control, in a sensible order.

If the cause turns out to be the opener, the garage door opener repair page explains the kind of work involved, and if a sensor needs attention, see the sensor and safety eye repair page. Homeowners in the wider region can begin from our page about garage door service in Houston.

Questions and answers