Mon (to) Sun: 7:30am - 8:00pm
San Antonio
Mon (to) Sun: 7:30am - 8:00pm
San Antonio
Your garage door opener is one of those things you don’t think about until it stops working. You press the button, the door goes up. Press it again, the door comes down. Simple. But when the remote stops responding, the motor hums without moving anything, or the door reverses the moment it touches the ground — suddenly that simple system feels a lot more complicated.
Most opener problems are fixable. That’s worth saying up front, because a lot of homeowners assume the whole unit needs to go when something goes wrong. At Sentinel Garage Door repair, we diagnose and repair garage door openers across San Antonio — and more often than not, we can get yours working again without replacing it.
Before you call anyone, it helps to know what you’re looking at. Here’s a quick breakdown of the most common opener symptoms we see, what’s usually behind them, and how we handle each one:
Opener Not Working Right? Find Your Symptom.
Match what you're experiencing to what's likely going on:
Not sure which one fits? Call (210) 864-9594 and describe what's happening. We'll tell you what it likely is before we show up.
(210) 864-9594
We test the full system — not just the part that seems broken. That means checking the remote signal, wall button, sensor alignment, motor function, drive mechanism, and wiring. Many issues come from adjacent problems like misaligned sensors or spring-related strain. We identify the true root cause before making any repair.
Once we know what’s going on, we walk you through it in plain language. No jargon. We explain what failed, why it happened, and your options — whether it’s repair or replacement — along with our honest recommendation.
We fix the issue on-site using quality replacement parts. Common fixes include gear replacement, sensor realignment, logic board swaps, remote reprogramming, and chain or belt adjustments. Most repairs are completed within an hour.
We cycle the door multiple times — open, close, reverse test, sensor check, and remote check. We also verify force and travel settings to ensure safe and smooth operation before we leave.
Not every opener problem looks the same, and the fix varies depending on the brand, model, and age of the unit. Here are the repairs we handle most often:
Remote and keypad reprogramming. Lost signal, unresponsive remotes, or keypads that stopped working after a power outage. These are usually quick fixes — we reprogram your existing devices or set up new ones if needed. This applies to LiftMaster, Chamberlain, and Genie remotes alike.
Safety sensor repair and alignment. The photo-eye sensors at the bottom of the tracks are one of the most common sources of opener trouble. A sensor that’s slightly out of alignment, dirty, or has a loose wire will prevent the door from closing. We see this constantly, especially after someone bumps a sensor with a car tire or a trash can.
Gear and drive mechanism repair. The internal gears that connect the motor to the drive system wear down over time, especially in chain-drive openers. When the motor runs but the door doesn’t move, stripped gears are usually the culprit. We carry common gear kits for major brands and can replace them on-site.
Logic board replacement. The circuit board is the brain of the opener. When it fails, you get erratic behavior — the door opens on its own, the lights flash randomly, or the unit stops responding to commands altogether. Board replacement is more involved, but it’s still a repair, not a full replacement.
Motor and capacitor issues. If the motor is buzzing but not turning, or it overheats and shuts off, the capacitor may have failed. In some cases, the motor itself has worn out. We’ll test both and let you know whether a repair makes sense or whether the unit is better off being replaced.
If your opener falls in this category, check out our garage door opener replacement page for details.
We service most residential garage door opener brands. The ones we see most often in San Antonio homes are LiftMaster, Chamberlain, and Genie — but we also work on Craftsman, Skylink, Linear, and other common models. If your LiftMaster opener stopped working, your Chamberlain remote needs reprogramming, or your Genie opener won’t respond — we’ve seen it before and we know how to fix it.
We keep common parts on hand for these brands, so most repairs can be completed in a single visit without waiting for parts to ship.
Garage Door Opener Repair — Questions We Hear Often
This is almost always a sensor issue. The safety sensors at the bottom of the tracks are either misaligned, dirty, or blocked by something. When they can't confirm a clear path, the opener reverses the door as a safety measure. Start by checking if anything is in front of the sensors, then wipe the lenses with a dry cloth. If the small LED light on one sensor is flickering or off, the alignment has shifted. We can fix this quickly on-site. If the sensors check out fine and the problem continues, the issue may be with the opener's logic board.
Probably not. If the wall button operates the door normally, the opener itself is working fine. The problem is with the remote, not the motor. Start with fresh batteries. If that doesn't help, the remote may need reprogramming or replacing. On older openers, the remote frequency can also become incompatible after a logic board replacement. We carry remotes for LiftMaster, Chamberlain, and Genie and can program them on the spot. A new remote costs far less than a new opener.
A blinking opener light is a diagnostic signal. On most LiftMaster and Chamberlain models, the number of blinks tells you what's wrong. One blink usually means the sensors are disconnected. Four blinks means the sensors detect an obstruction. Ten blinks indicates a wiring issue. Check that nothing is blocking the sensors and that the wires running from the sensors to the opener haven't been damaged. If the blinking continues after clearing the path, we can diagnose the exact error code on-site.
Yes. We work with all major residential brands, including LiftMaster, Chamberlain, Genie, Craftsman, and most others. The internal components across brands follow similar principles, so diagnosing and repairing them is familiar territory for us. If a specific replacement part is discontinued or hard to source, we'll let you know upfront and discuss whether a full opener replacement makes more sense. We serve homeowners across Stone Oak, Shavano Park, Castle Hills, and the surrounding San Antonio area.
It depends on what's wrong. A sensor realignment or remote reprogramming is on the lower end. A gear replacement or logic board swap costs more because the parts are pricier. A full opener replacement is the most involved but gives you a brand new unit with a full warranty. We provide a clear quote before starting any work, so you know exactly what you're paying for. No hidden fees, no pressure.
The opener itself isn't the dangerous part. Replacing a remote, resetting sensors, or reprogramming a keypad are safe for most homeowners. The danger starts when the problem involves the spring system, the cables, or the door's balance. These components are under extreme tension, and adjusting them without proper tools and training can cause serious injury. If the repair goes beyond the opener unit itself, call a professional. The cost of a service call is always less than an ER visit.
Still not sure what's wrong with your opener?
Call us. We'll diagnose it on-site and give you a clear answer.
📞 (210) 864-9594
We repair garage door openers throughout San Antonio and the surrounding communities, including Stone Oak, Shavano Park, Hollywood Park, Castle Hills, Leon Valley, and Timberwood Park. Whether you’re in a newer development with a Wi-Fi-connected opener or an older neighborhood with a chain-drive unit from the early 2000s — we know these systems and we can fix them.