The Short Answer
A gate that begins closing and then reverses is detecting an obstruction. That is the gate working exactly as designed — the question is whether the obstruction is real. The most useful detail is where in the travel it reverses. If it reverses immediately on starting to close, a safety sensor is triggering. If it reverses at the same point partway through, something is physically binding at that spot. If it reverses right at the very end, just before latching, the gate is hitting a stop or the limit is out of position. Each of those points to a different repair, and noting which one you have before calling saves real time.
Most Likely Causes, In Order
01
A safety sensor triggering
If the gate reverses immediately or within the first moment of closing, the photo eyes are reporting an obstruction. Usually they are dirty, spider-webbed, or knocked out of alignment rather than broken. This is the most common cause and often the cheapest to resolve — sometimes a wipe with a dry cloth is the whole repair.
02
A physical bind partway through the travel
If it reverses at the same point every cycle, go look at that point. A heaved slab, a tree root, a seized roller, packed debris in a slide gate track, or a hinge that binds at a particular angle will all produce resistance the operator correctly reads as an obstruction. The gate is telling you something real.
03
Force sensitivity set too tight
Obstruction detection works by sensing resistance, and that threshold is adjustable. Set too sensitively, ordinary variation — wind pushing on the gate, a slight grade, a stiffer section of travel — reads as an obstruction. This commonly appears after a board replacement reset the settings, and it is a calibration job rather than a failed part.
04
Limit switch out of position at the closed end
If the gate reverses right at the end of its travel, just as it should be latching, the closed limit is often set past where the gate can actually go. The gate reaches a physical stop before it reaches the limit, the operator reads that as an obstruction, and it reverses. Very common on gates a few years into service as the limits drift.
05
The gate is hitting the latch, post, or the other leaf
On a double gate the two leaves have to arrive in the right order and meet cleanly; if one is mistimed or has sagged, they collide and both reverse. On a single gate a shifted post or a misaligned latch catch produces the same result. In Houston this traces back to soil movement moving posts more often than to anything on the gate itself.
06
Water in a sensor or wiring
A photo eye with a failed gasket, or moisture in the sensor wiring run, produces intermittent false obstruction signals. The signature is a problem that is much worse in wet weather and sometimes disappears entirely when things dry out. A gate that only reverses after rain is usually this.
What You Can Safely Check Yourself
Watch two or three full cycles before touching anything. Where it reverses is the single most valuable piece of information on this problem.
- ✓Watch where it reverses: immediately, at the same point partway, or right at the end
- ✓If it reverses immediately, wipe both photo-eye lenses and check for spider webs
- ✓Confirm the two sensors still point directly at each other
- ✓If it reverses at the same point every time, go inspect exactly that spot
- ✓If it reverses at the very end, look at whether the gate is reaching a stop or the latch
- ✓Note whether it is worse in wet weather, which points to moisture in a sensor
The Reversal Is the Safety System Working
It is worth being clear about what is happening here: the gate is reversing because it believes something is in its path, and that behavior is the entrapment protection required by the recognized safety standard for automatic gates. The wrong fix is to turn the force setting up until the gate powers through, or to disconnect the sensors so nothing can stop it. Either one removes the protection that exists because gates have crushed and killed people, children especially. If someone proposes solving a reversing gate by making it less sensitive, get a second opinion. The correct repair restores the gate's ability to move freely so there is nothing to detect.
When to Stop and Call Someone
Call if the lenses are clean and aligned and it still reverses, if it reverses at a consistent point you cannot find anything at, or if it reverses right at the latch. Those point to limit drift, force calibration, a sagging leaf, or a failing sensor, and none are homeowner repairs. Call sooner if the gate has been left standing open as a result, since that leaves your property unsecured. Our $89 diagnostic covers the sensors, the limits, the force calibration, the full travel path, and the gate structure, and it is applied toward the repair.
Questions People Ask
Why does my gate close partway and then reopen?
Because it is detecting what it believes is an obstruction, which is the entrapment protection doing its job. Where it reverses tells you the cause. Reversing immediately means a safety sensor is triggering, usually because it is dirty or misaligned. Reversing at the same point partway through means something is physically binding at that spot. Reversing right at the end usually means the closed limit switch is set past where the gate can actually travel.
Is my gate reversing because it is broken or because it is working?
Both can be true, which is what makes this confusing. The reversing behavior itself is the gate working correctly — it is designed to reverse rather than crush. What is broken is whatever is making it think there is an obstruction: a dirty sensor, a bind in the travel, a drifted limit, or a force setting that is too sensitive. The fix is to remove the cause, not to stop the gate from reversing.
Can I turn up the force so it closes all the way?
Please do not. The force setting is what lets the gate tell the difference between normal travel and a person, pet, or vehicle in the opening. Turning it up so the gate powers through an obstruction removes that discrimination. If the gate is binding on a raised slab or a seized roller, more force also means it drives into that obstruction harder each cycle, damaging the gate and the operator.
My gate only reverses when it rains. Why?
Moisture, in one of two places. Either a photo eye has a failed gasket and water inside is producing false obstruction signals, or water has gotten into the sensor wiring run or a junction box. A gate that misbehaves in wet weather and behaves perfectly once things dry out is close to a signature for this, and it is common in Houston given how much rain we get and how long things stay damp.
My double gate reverses every time. Is that different?
It can be. On a double gate the two leaves have to arrive in a coordinated sequence and meet cleanly in the middle. If one leaf has sagged, if the timing between them has drifted, or if a post has shifted, the leaves collide and both reverse. The repair is usually resequencing the operators and correcting whichever leaf has dropped, rather than anything to do with the sensors.
Should I leave the gate open until it is fixed?
Leaving it open means your property is unsecured, which is a real cost. The better interim step is to use the manual release to disconnect the operator, close the gate by hand, and secure it with a chain or padlock until it is repaired. That keeps the property closed without repeatedly cycling an operator that is straining against something.