Published 2026-04-22 · Madison Garage Door Pros

Garage Door Opener Not Working: A 12-Point Diagnosis

Quick answer: Run these 12 checks in order before you call anyone. Many "garage door opener not working" calls turn out to be five-minute DIY fixes: a tripped GFCI, a dead remote battery, a leaf stuck on a photo-eye lens. The checklist below walks you through power, remote, sensor, and mechanical issues. If you reach the end and the door still won't budge, you've narrowed it down enough that our estimate will be quick.

Before we get to the list, one ground rule. Don't pull anything apart, don't loosen any springs, and don't put a screwdriver into the wall console. The point of this checklist is to identify problems you can solve with your hands and a fresh 9-volt, or at least to tell us exactly what's broken before we come out. Every check below takes under two minutes.

Group A: Power-side checks (the embarrassing ones)

Nobody wants to hear it, but a tripped breaker is the most common cause of a totally silent opener. Start at the wall and work toward the motor.

Check 1: Does the outlet have power? Plug a phone charger or a lamp into the ceiling outlet the opener is using. If it doesn't power up, you have a tripped breaker, a tripped GFCI, or a dead outlet. Don't skip this one. A tripped breaker is easy to miss after a thunderstorm, especially on a circuit you don't check often.

Check 2: Is the opener itself plugged in? Sounds insulting until you remember that holiday lights, paint sprayers, and shop vacs all need that ceiling outlet, and the cord gets unplugged and forgotten. Look up at the motor head. Confirm the plug is fully seated. Some older LiftMasters have a hardwired pigtail that loosens over time; if yours wiggles, push it back in firmly.

Check 3: Has the GFCI tripped? Wisconsin code has required GFCI protection on garage outlets since the 1980s, and a lot of attached garages in Middleton and Fitchburg run the opener through a GFCI in the garage itself or upstream in a bathroom or exterior outlet. Hit reset on every GFCI you can find. A summer storm with a nearby strike will pop these and leave the rest of the house running fine.

Check 4: Is the lockout switch on the wall console engaged? Most modern wall consoles have a vacation mode or lockout button that disables remote signals. It's a tiny slider or a long-press button. If a kid was playing with the console or your house cleaner brushed it, the remote will do nothing while the wall button still works. Toggle it off and try the remote again.

Group B: Remote and signal checks

If you've confirmed the opener has power and the wall button works but the remote doesn't, the problem is somewhere between the remote and the motor antenna. These four checks isolate it fast.

Check 5: Is the remote battery fresh? A remote with a weak battery often still shows an LED when you press the button but doesn't have enough signal strength to reach the opener. Swap in a fresh CR2032 or 9-volt (depending on your model) before assuming anything more serious. This is a common cause of a remote that seems dead.

Check 6: Are you within 30 feet, line of sight? Standard 315 MHz and 390 MHz openers are rated for about 100 feet in open air but a lot less through walls, cars, and metal. Stand directly under the opener and press the remote. If it works there but not from your driveway, the issue is range, not the opener. Move on to check 7.

Check 7: Is the garage full of metal shelving or appliances blocking signal? A new fridge in the garage, a steel tool chest, a metal pegboard wall, or a row of metal storage racks near the opener can cut remote range in half. Reposition the antenna wire (the thin one hanging down from the motor) so it dangles freely, away from metal.

Check 8: Has the rolling code desynced after a power outage? LiftMaster, Chamberlain, and most modern openers use rolling-code security, where the remote and the receiver advance through a synchronized sequence with each press. A brownout or surge can knock them out of sync. Hold the LEARN button on the motor head until the indicator light turns on, then press the remote button within 30 seconds. That re-pairs them. Summer storms and outages are common in Wisconsin, so this is worth checking after any power blip.

Group C: Safety sensor (photo-eye) checks

If the opener tries to close and then reverses, or refuses to close while the open command still works, the photo-eye sensors are the prime suspect. Federal law has required these on every opener since 1993, and they're a frequent cause of "opener not working" calls in spring and fall.

Check 9: Are both photo-eye LEDs lit green? Look at the two small sensors mounted about six inches above the floor on either side of the door. One has a steady green light (receiver), the other has a steady amber or red (sender). If one is dark or blinking, the sensor itself is bad, the wire is cut, or alignment is off. A dark LED on the receiver side almost always means alignment, not a dead unit.

Check 10: Is the lens blocked? Wipe both lenses with a soft cloth. Leaves, cobwebs, snow drift from a January Madison thaw-refreeze cycle, and even bright low-angle sun shining directly into the receiver can fake out the sensor. Sunshine is a sneaky one. If your door refuses to close only on sunny winter afternoons, the receiver lens is getting blasted with direct light. A small piece of cardboard taped above the lens as a sun shade is a real fix that we recommend often.

Check 11: Is alignment within 2 to 3 degrees? Each sensor bracket pivots on a single fastener. Free it, nudge the sensor a few degrees at a time until its LED turns steady green, then lock the bracket back in place. Check both sides. This fix solves more of these calls than anything else on the list, especially after someone bumps a sensor with the snow blower.

Group D: Mechanical and door-side checks

Check 12: Is the door jammed? If you can see a gap in a spring, skip this and call. Otherwise, pull the red emergency release rope hanging from the trolley. With the opener disengaged, try to lift the door by hand. If it won't move, you have a frozen bottom seal (very common in Madison winters when the seal welds to the concrete after a thaw-freeze cycle), an off-track door, or broken springs. A frozen seal you can usually free by kicking the bottom edge gently or pouring warm water along the threshold. An off-track door or a broken spring is a stop-now-and-call situation. Do not run the opener against a stuck door. It can burn out the motor capacitor and turn a simple fix into a bigger opener repair.

What each check tells you about the underlying fault

Here's how to read the results. If checks 1 through 4 didn't find the problem, the opener has power. If checks 5 through 8 didn't find it, your remote is communicating. If checks 9 through 11 didn't find it, your safety sensors are happy. And if check 12 says the door lifts smoothly by hand but the motor still won't engage, you're looking at an internal opener fault: usually a stripped main gear, a failed capacitor, or a dead logic board.

Internal opener faults are where the service call earns its keep. A stripped gear sounds like a motor running with no door movement. A failed capacitor sounds like a hum with no start. A dead logic board is total silence with confirmed power. Each of these is priced after we see the unit, and most fall in the same range as any other opener repair. If your unit is over 15 years old, we'll often recommend a belt-drive replacement instead, usually $480 to $780, because chasing parts on an old chain-drive usually means another repair within a year.

Brand-specific quirks worth knowing

Some of the most frustrating "opener not working" cases aren't actually broken hardware. They're software glitches that look like hardware failures.

LiftMaster with myQ Wi-Fi: After a firmware update, some myQ-enabled LiftMaster units started ignoring the wall button if the Wi-Fi module lost connection to the router. The fix is to unplug the opener for 60 seconds, then re-add it in the myQ app.

Chamberlain rolling-code resync: Chamberlain's resync procedure is slightly different from LiftMaster's even though the companies share parts. The LEARN button is in a different spot on the motor head, and on some models you have to press it twice. Check your model's manual or the sticker on the side of the motor.

Genie Aladdin Connect: Genie's smart module has a known bug where the door status shows "closed" in the app even when it's open, after the device reboots. This isn't dangerous, but it can fool you into thinking the door isn't responding when it actually is. Force-close the Aladdin app and reopen it.

For Sommer and Linear openers, both less common in Wisconsin, the resync process is in the manual under "transmitter learning." These brands are reliable but the documentation is harder to find online.

When DIY ends and the service call starts

If you've run all 12 checks and the door still won't move, that's when our estimate pays off. The visit covers a full inspection: spring tension test, cable check, roller condition, sensor circuit test with a multimeter, and a logic board read where we can pull error codes from the unit's memory. We'll quote the fix on the spot.

Three symptoms mean stop, don't touch it, call now. First, a snapped torsion spring, which sounds like a gunshot from inside the garage and leaves a visible gap in the coiled spring above the door. Don't try to lift the door manually if a spring snapped, because the cables will be unloaded and the door is dead weight. Second, a cable off the drum, which looks like a slack wire dangling from the side of the door. Third, any door that's visibly tilted in the tracks, which means it jumped a roller and could fall.

Why Wisconsin garages eat opener boards

If you've owned more than one opener in a Madison-area home, you may have noticed they wear out sooner than you expected. Wisconsin garages are hard on openers in three ways.

First, humidity in attached garages. When you park a wet car in a 35-degree garage after a snowy commute home, the moisture condenses on every cold surface inside, including the opener's logic board. Do that 40 times a winter for 10 years and the contacts corrode. Second, the cold-condensation cycle. The opener housing warms up when the motor runs and cools when it sits, which pumps moist air in and out through any gap in the cover. Third, summer power blips. Madison's grid handles thunderstorm season pretty well, but the brownouts and micro-surges that go with it are murder on capacitors. A surge protector designed for the opener circuit extends life noticeably.

None of this means you need a new opener every five years. It does mean that if your unit is past 12 years old and acting flaky, sometimes the smartest move is a belt-drive replacement rather than chasing the next failure. We'll tell you straight which way the math goes when we come out.

Frequently asked

If the opener light works but the door doesn't move, what does that mean?

Light circuits and motor circuits are wired separately, so a working bulb tells you the unit has power but nothing about the motor. The most common culprit is the safety photo-eyes: blocked, misaligned, or one of the lenses has lost its green LED. Check both sensor lights first. If they look fine, the next suspect is a stripped main drive gear, common on 15-year-old units. We price that after we see the opener.

Why does my remote work outside but not inside the car?

Car windshields with metallic sun-blocking film act like a Faraday cage and can cut the signal range of a standard remote sharply. Try opening the door from outside the car at 10 feet away. If that works, you have a windshield issue, not an opener issue. The fix is usually a visor remote with the antenna positioned at the top of the windshield, or pairing with the in-car HomeLink module.

Can I bypass the safety sensors temporarily?

We don't recommend it. The photo-eyes are required by federal law on every opener sold after 1993, and disabling them removes the only thing that stops the door from closing on a child, pet, or car bumper. If the sensors are bad, hold the wall-button down continuously to force-close the door once (most openers allow this), then call us. A new pair of photo-eyes is cheap insurance, and we price it after we see the unit.

How do I tell if it's the opener or the door that's the problem?

If you can see a gap in a spring, skip this and call. Otherwise, pull the red emergency release rope and lift the door by hand. A healthy door should feel like it weighs about 8 to 12 pounds across the whole travel, balanced at the halfway point. If it slams down or fights you on the way up, the springs are the issue and the opener is just the messenger. If it lifts smoothly by hand but the motor still won't run it, the problem is in the opener itself.

Do you charge to come out and look at it?

No. Estimates are free, with no diagnostic fee. If we can't fix it that day (rare, but it happens with discontinued boards or parts we need to order), you'll know the plan and the price before we leave. Same-day repair is often possible when parts are on hand.

Do you stock parts for old openers (15+ years)?

Yes for the common ones. We carry gears, sprockets, and capacitors for LiftMaster, Chamberlain, and Genie units going back to the early 2000s. For really old Sears Craftsman or off-brand units where the logic board is no longer manufactured, we'll usually recommend a belt-drive replacement in the $480 to $780 range rather than chasing a board that may fail again.