The Short Answer
If your gate opens normally but refuses to close, the problem is almost never the motor. It is the safety sensors. Automatic gates are required to have entrapment protection — photo eyes that shoot an invisible beam across the opening. If that beam is broken, dirty, or misaligned, the operator believes something is in the path and refuses to close. This single cause accounts for the large majority of the "won't close" calls we run across Houston. The good news is that it is often a sixty-second fix you can do yourself.
Most Likely Causes, In Order
01
Dirty or spider-webbed sensor lenses
This is the number one cause in Houston, and it is seasonal. Spiders build webs across the photo-eye housings, and a web dense enough to scatter the beam reads to the operator as a solid obstruction. Dust, pollen, and grass clippings from a mower do the same thing. Wipe both lenses with a dry cloth and try again before you do anything else.
02
Sensors knocked out of alignment
The two photo eyes have to point directly at each other. A weed trimmer, a bumped post, a delivery truck, or even ground shift can nudge one a few degrees and break the beam permanently. Most sensors have a small indicator LED that changes state when alignment is good — check both units.
03
Something actually is in the path
Worth ruling out before you blame the hardware. A trash bin, a pet, a low-hanging branch, a bag that blew in, or a vehicle parked just inside the swing arc will all correctly stop the gate. Walk the full path of travel and look at ground level.
04
Limit switch drifted out of position
The limit switches tell the operator where "fully closed" is. When one drifts, the gate can stop short of the latch, travel too far and bind, or refuse to start the closing cycle at all. This is a calibration job, not a parts failure, and it is common on operators past about five years.
05
The gate is physically binding
If the gate scrapes the driveway or catches at one point in its travel, the operator senses the resistance and reverses as designed. In Houston this usually traces back to a heaved gate post rather than to the gate itself — our clay soil moves seasonally and tilts posts over time.
06
Failed or failing safety sensor
Sensors do die, usually from water intrusion or a power surge. If the lenses are clean, the alignment is right, the path is clear, and the gate still will not close, a sensor has likely failed and needs replacing. Do not let anyone "solve" this by disconnecting the sensors.
What You Can Safely Check Yourself
Work through these in order. Most people find the problem in the first two steps, and none of this requires tools or touching anything electrical.
- ✓Wipe both photo-eye lenses with a dry cloth — check for spider webs first
- ✓Confirm the two sensors point directly at each other and look for their indicator LEDs
- ✓Walk the entire path of travel at ground level, looking for obstructions
- ✓For slide gates, sweep the track clear of rocks, mud, and debris
- ✓Check whether the gate scrapes the ground at any point in its swing
- ✓Try closing from the keypad as well as the remote, to rule out a remote fault
Do Not Disable the Sensors
If a contractor or a video suggests bypassing or unplugging the photo eyes to make the gate close, stop. Those sensors are the entrapment protection required by the recognized safety standard for automatic gates, and they exist because gates have seriously injured and killed people, children especially. A gate with its safety sensors disconnected is a liability sitting on your property, and in an injury claim it is indefensible. The correct fix is to repair the sensor, not to remove it.
When to Stop and Call Someone
Call if the lenses are clean, the sensors are aligned, the path is clear, and the gate still refuses to close — that points to a failed sensor, a drifted limit switch, or a control board fault, none of which are homeowner repairs. Call immediately regardless if the gate is stuck open and your property is unsecured. Our $89 diagnostic covers the full system: sensors, limits, board, motor, and the gate structure itself, and it is applied toward the repair.
Questions People Ask
Why does my gate open but not close?
Because closing is the direction that requires safety clearance. Automatic gates have entrapment protection sensors that only govern the closing cycle, since a closing gate is what can trap a person or vehicle. When those sensors are dirty, misaligned, or faulty, the operator still opens normally but refuses to close. That asymmetry is the single clearest sign the problem is a sensor rather than a motor.
Can I just clean the gate sensors myself?
Yes, and you should try that first. Wipe both lenses with a dry cloth, check for spider webs, and make sure the two units point directly at each other. This resolves a large share of won't-close calls and costs nothing. Use a dry cloth rather than a spray cleaner, which can seep into the housing.
Is it safe to leave my gate open overnight if it won't close?
It leaves your property unsecured, which is a real risk, but forcing the gate is worse. If you need to secure the opening immediately, use the manual release to disconnect the operator and close the gate by hand, then secure it with a chain or padlock until it is repaired. Do not repeatedly press the button hoping it catches, because that strains the motor.
My gate starts closing and then reverses. Is that the same problem?
Usually yes, and it points to the same family of causes. A gate that begins closing and then reverses is detecting an obstruction partway through, which means a sensor is intermittently triggering, the gate is binding at a specific point in its travel, or the force setting is calibrated too sensitively.
Does rain or weather make this worse?
Yes. Houston humidity encourages spider activity around sensor housings, heavy rain can drive water into a sensor with a failed gasket, and lightning surges damage boards and sensors. We see a predictable spike in won't-close calls after storm weeks.
How long does this repair usually take?
If it is cleaning or realignment, minutes. A sensor replacement or limit switch calibration is typically done in a single visit. We carry the common sensors and parts on the truck so most won't-close calls are resolved the same day we arrive.