A garage door that won't open is almost always one of four problems: the opener isn't getting power or a signal, the safety sensors are blocked or misaligned, a spring has broken, or the door has jumped its track. Check the sensors and the opener first. Those two cause most no-open calls and take two minutes to rule out. Springs and tracks take longer, and one of them means stop and call a pro.

If your car is stuck inside and you're on a clock, work through this list in order. Most of what stops a garage door has nothing to do with the door itself.

Start with the safety sensors

Every opener made since 1993 has to have a photo-eye safety sensor system by federal law, two small eyes mounted a few inches off the floor on each side of the track. If either eye is blocked, dirty, or knocked out of alignment, the opener will refuse to close the door and, on some models, refuse to open it too.

Look at both sensors. A light should be steady on each one, not blinking. Monsoon season packs dust into these tracks every July through September here, and a dusty lens is enough to throw the alignment off by a hair. Wipe both lenses with a dry cloth, then check that neither bracket has been bumped loose — a stray bike, a trash can, a kid's bat. If the lights still won't hold steady, the sensor's alignment needs adjusting, which usually takes a few minutes by hand.

Check the opener itself

Make sure the opener is actually getting power. Look for a status light on the unit mounted to your garage ceiling. No light at all points to a tripped breaker or an unplugged cord — openers get bumped loose during storage shuffling more often than people expect.

If the opener has power but does nothing when you press the remote or wall button, try the wall button directly. A dead remote battery is common and cheap to rule out. If the wall button does nothing either, the opener's logic board or motor may have failed. That's a repair call, not a DIY fix, and it's covered in more depth in our garage door opener repair guide.

Look for a broken spring

Stand back and look at the door itself, not the opener. A garage door with a broken torsion spring often won't budge, or the opener strains and makes a grinding or straining sound without lifting the door. If you see a visible gap in the spring above the door, or a spring that looks like it's split in two, that's your answer.

Stop here. Do not try to open the door manually and do not let the opener keep straining against it. A wound torsion spring holds enough stored force to cause serious injury or worse if it lets go while someone is working near it, and DIY spring replacement is one of the most common causes of garage door injury. This is not a socket-wrench repair. A trained technician has winding bars and knows how to match spring rate to your door's weight and release the tension under control. Arizona's heat makes this more likely to happen here than in milder climates — springs cycle through more expansion and contraction in a 115°F summer, and that accelerates metal fatigue. See our spring replacement cost guide for what to expect once you call someone.

Check whether the door came off track

If the door is partway open and stuck, or looks crooked in its opening, it may have jumped the track. Rollers pop out of the track for a few common reasons: a bent track rail, a roller that's worn out, or an obstruction the door hit while closing. Don't force the opener to keep trying. Running the motor against a door that's off track puts stress on the opener and can bend the track further or snap a cable. Our garage door off track guide walks through why this happens and what a technician does to fix it.

When a garage door that won't open needs a technician

Call a garage door technician if:

Garage door licensing in Arizona isn't as uniform as some other trades — requirements vary by scope of work and dollar amount, so check a specific contractor's status at azroc.gov before booking rather than assuming a blanket rule. The IDA's homeowner safety and maintenance guide also walks through the monthly checks worth doing once your door is working again, including the door-balance test and the reversing-mechanism test.

Get quotes from a local pro in Chandler, Gilbert, or Phoenix using the form below — comparing two or three quotes before you commit is worth the extra ten minutes, especially on a spring or opener repair.

Common questions

Why would my garage door opener open the door but not close it?

This almost always points to the safety sensors. If either photo-eye is dirty, misaligned, or blocked, the opener reads it as an obstruction and refuses to close, even though opening isn't blocked by the same safety circuit. Wipe both lenses and check alignment before assuming the opener itself has failed.

Why is my garage door not responding to the button or remote?

Check the wall switch directly first. If that does nothing, the opener likely isn't getting power, check the breaker and the plug. If the wall switch works but the remote doesn't, try fresh batteries and a manual resync. A dead remote is common and cheap to rule out.

Why isn't my garage door opening even though the motor is running?

A motor that hums or runs without lifting the door usually points to a stripped drive gear or a slipped belt or chain inside the opener. It can also mean the door itself is mechanically stuck, a broken spring or an off-track roller, so the opener is straining against something it can't move.

What would stop a garage door from opening?

The four usual suspects are a power or remote problem, blocked or misaligned safety sensors, a broken spring, or a door that's jumped its track. Sensors and power issues take minutes to rule out. A visible broken spring or a crooked door means stop and call a technician instead of forcing it.

If your problem turned out to be a noisy, straining opener rather than a door that won't move at all, our opener repair guide above covers those symptoms specifically.

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