Garage Door Won't Open? A Tech's Step-by-Step Fix List

Garage door won't open: nine times out of ten it is one of five things, and you can check most of them in five minutes: a tripped power or wall lock, misaligned photo-eye sensors, dead remote batteries, a broken spring, or a disengaged trolley. Work the list in order and you will usually find it.

I get called for this constantly, and a good chunk of the time it is something the homeowner could have fixed for free if they knew where to look. So I am going to walk you through the exact order I check things in the field, easiest and safest first. I will also be clear about the one thing that is not DIY: if the spring or a cable is broken, stop and call a pro. That is dangerous, not a screwdriver job. More on that below.

Before You Start: Is It Stuck Up or Stuck Down?

If the door is stuck open, do not park under it and walk away assuming it will hold. If a spring is involved it can come down. If it is stuck closed, you can still get your car out the side door while you diagnose. Either way, work calmly and keep hands and fingers out of the tracks and hinges.

Step 1: Power and the Wall Lock

The most common "it's broken" call is not broken at all.

• Check that the opener is plugged in. Vibration and bumped cords happen more than you would think. Look up at the ceiling unit and confirm the cord is seated in the outlet.
• Check the outlet itself. Plug in a phone charger or a lamp. A tripped GFCI or breaker kills the opener. Reset the breaker and the GFCI button if there is one.
• Check the wall console for a lock or vacation mode. Many wall buttons have a "lock" feature that disables the remotes on purpose. If your remotes died all at once but the wall button still works, the lock is almost certainly on. Hold the lock button to toggle it off.

If the opener has no lights and nothing happens at the wall button, it is a power problem. Fix that first before you touch anything else.

Step 2: The Photo-Eye Safety Sensors

This is the single most common real fault I find. Two small sensors sit near the floor on each side of the door, maybe six inches up. They shoot an invisible beam across the opening. If the beam is broken or the sensors are out of alignment, the door will not close, and on many openers it gets confused enough that it acts dead.

Tell-tale sign: the door opens fine but will not close, or it starts to close and reverses, and the opener light blinks several times. That blinking is the opener telling you the sensors are unhappy.

• Wipe the lenses. Spider webs, dust, road grime, and even bright sunlight hitting the lens can block the beam.
• Check alignment. Each sensor usually has a small LED. When they are aligned and seeing each other, both lights are solid. If one is off or blinking, gently nudge the sensor up or down by hand until both go solid.
• Check the wires. A weed whacker, a stored bike, or a curious pet can knock a sensor or pull a wire loose. Look for a dangling sensor or a pinched wire.

A set of replacement safety sensors is cheap if yours are cracked or water-damaged:

• Garage door safety sensors

Step 3: Remote and Keypad Batteries

If the wall button works but the handheld remote or the outside keypad does not, it is almost always a dead battery in the remote, not a problem with the opener.

• Swap the remote battery. Most use a small coin cell like a CR2032 or a 23A. Keep spares.
• Re-pair if needed. After a battery change, some remotes need to be re-learned. There is a "learn" button on the opener motor head. Press it, then press the remote, and it relinks.
• If only the outside keypad is dead, change its battery too and re-enter your code.
• CR2032 batteries
• Universal garage door remote

Step 4: The Broken Spring Test (Stop Here If It Fails)

This is the important one. If power is fine, sensors are aligned, and the door still will not move, or the opener strains, hums, and reverses, you may have a broken spring.

Here is the safe test. Pull the manual release cord, the red handle hanging from the trolley, which disconnects the door from the opener. Now try to lift the door by hand. A properly sprung door is light and will glide up and stay where you leave it.

• If the door is suddenly very heavy, feels like dead weight, or slams back down, you likely have a broken spring.
• Look at the torsion spring above the door. A clear gap or separation in the coil means it snapped.

If the spring is broken, stop. Do not run the opener, do not try to force the door, and do not try to replace the spring yourself. Wound springs and the cables store enormous energy and they injure people every year. This is a pro job, full stop. I cover the real numbers and why it is dangerous in my spring replacement cost guide. Same goes for a frayed or off-track cable. Cable and spring failures are where DIY ends and a phone call begins.

Step 5: Disengaged or Stuck Trolley

The trolley is the part that rides the rail and connects the opener to the door arm. If someone pulled the manual release, the trolley is disconnected and the opener motor will run but the door will not move.

• Listen. If the motor runs and the door stays put, the trolley is disengaged.
• Re-engage it. With the door closed, pull the release cord back toward the door, or run the opener until the trolley catches and reconnects. The exact motion varies by brand, so check your manual, but most reconnect by pulling the cord straight down or by cycling the opener.
• Check for an obstruction. A stuck or jammed trolley, a bent rail, or debris in the track can stop it. Look for anything binding.

Step 6: Dead Logic Board or Motor

If you have ruled out power, sensors, batteries, springs, and the trolley, the brain of the opener may be done. Logic boards die from age, power surges, and lightning. Signs include no response at all with confirmed power, random behavior, or a burnt-electronics smell.

A logic board can sometimes be replaced for less than a whole opener, but on an older unit it is often smarter to replace the opener entirely, especially if you also want battery backup and Wi-Fi. If you are at this stage, my best garage door openers guide walks through what I would install. A surge strip on the opener outlet is cheap insurance against the next storm:

• Surge protector outlet

A Little Lube Fixes More Than You'd Think

If the door moves but is loud, jerky, or sticky in spots, the problem is often dry rollers, hinges, and tracks rather than the opener. The right product is a garage-door-specific lubricant, not WD-40, which is a solvent that dries out and attracts grime. Worn rollers cause binding too:

• Garage door lubricant
• Nylon garage door rollers

For the full upkeep routine that prevents most of these calls, see my maintenance guide.

Cold Weather and Other Odd Cases

A few situations do not fit the main list but come up enough that I want to cover them.

• The door is frozen to the ground. In winter, the bottom seal can freeze to the concrete after rain or snowmelt. The opener strains and reverses because it thinks it hit an obstruction. Do not keep hammering the button. Break the ice seal by hand or with warm water along the bottom, then try again. Repeated forcing can strip the opener gear or bend a panel.
• The opener works in cold but the remote range drops. Cold weakens coin-cell batteries. If your remote only works up close in winter, change the battery before you assume the opener is failing.
• The door reverses for no reason on the way down. Beyond the sensors, this can be the down-force setting set too sensitive, or a roller binding in a dirty or bent track. Clean the tracks, check for a bad roller, and if it persists have the force settings checked.
• The keypad randomly stops accepting the code. Usually a dying keypad battery or moisture in an outdoor keypad. Dry it out and swap the battery.

Quick Diagnosis Table

When you are standing in the garage trying to place the symptom, this is the fast version.

When to Stop and Call

Run the list in order. Power, sensors, batteries, the broken-spring test, the trolley, then the logic board. Most of the time you will land on a 10 dollar battery or a sensor you can nudge back into place with one finger. But the moment the door is dead weight by hand, or you see a snapped spring or a frayed cable, put the tools down. That is the line. Spring and cable work is genuinely dangerous and it is what pros are for. To find a reputable local tech instead of gambling on a search ad, browse the pros directory, and if you run a garage door business, you can get listed.