Garage door won't open? Here's how to diagnose it fast

By Daniel Brooks, Home maintenance writer and appliance troubleshooting specialist based in Charlotte, NC. Reviewed [date — human adds].

Quick answer

A garage door that won't open usually comes down to one of six things: dead remote or opener power, disconnected safety sensors, a broken spring, the door manually locked, a jammed track, or the opener's travel limits being off. Work through them in the order below, starting with the fastest to check.

Garage door safety sensor near the floor track, a common cause of a door that won't open.

Safety first

If the door won't open and you can see a spring above it that's visibly broken or stretched, meaning there's a gap in the coil, stop. Don't try to force the door open manually or run the opener repeatedly. Go straight to the section below on spring damage rather than working through the rest of this list.

Work through it in this order

Each step below takes a minute or two. Check them in sequence rather than jumping around, since the earlier ones are far more common than the later ones.

Does the opener have power?

Check that the opener is plugged into a working outlet.
Check the breaker for that outlet hasn't tripped.
Look at the wall control panel inside the garage. If its light is off, the unit likely has no power at all.

Remote batteries and pairing

Test the wall-mounted control panel directly, not the remote. If the wall button opens the door, the problem is isolated to the remote.
Swap in fresh batteries if the remote's indicator light is dim or not lighting at all.
If the wall button also does nothing, move to Step 3, the problem is upstream of the remote.

Safety sensors

The safety sensors, sometimes called photo-eye sensors, are the two small units mounted near the floor on each side of the door track. They send an invisible beam across the doorway, and if that beam is broken, the opener refuses to close or open the door as a safety measure.

Look at both sensors for a blinking light. A steady light usually means they're aligned; a blinking light means they aren't, or something is blocking the beam.
Check for anything in the beam path: a leaf, a stray tool, even direct sunlight hitting one sensor can cause a false reading.
Wipe both lenses clean and make sure the two sensors are pointed directly at each other, not at a slight angle.

Manual lock engaged

Some garage doors have a manual lock bar built into the door itself, separate from the opener. It's easy to accidentally engage after a power outage, when people sometimes lock up manually out of habit.

Check the inside of the door near the handle for a horizontal bar or lock lever.
If it's engaged, disengage it before testing the opener again.

Visible spring damage

If you've made it this far without finding the cause, look at the spring above the door.

What a spring problem looks like: a visible gap in the coil, or the door feeling far heavier than normal if you try to lift it manually.
If that's what you see, stop here. This isn't a step to work through, it's a sign to call a professional. See the guide to a spring that's visibly broken or stretched for what happens next and why it's not a DIY repair.

Opener travel limits or a motor issue

If the opener runs (you hear the motor) but the door doesn't move at all, and none of the steps above turned up a cause, the issue is likely the opener's travel limit settings or the motor itself. This is usually beyond a quick DIY fix and worth a call to a garage door technician.

If the opener works but the door won't budge

It helps to separate two different symptoms. If the opener hums or clicks but the door stays shut, the problem is mechanical: the track, a spring, or something physically jamming the door. If the opener does nothing at all, no sound, no light, the problem is electrical, and Steps 1 through 4 above are where to look first. Knowing which of these two you're dealing with saves time, since it tells you whether to keep troubleshooting the opener or start checking the door itself, including whether the door has come off its track.

When to call a professional

A spring that's visibly broken or stretched, as covered in Step 5.
The opener runs but the door doesn't move mechanically, pointing to a track, cable, or motor issue beyond a quick fix.
Sensor faults that keep happening with no visible cause you can find.
Any burning smell coming from the opener motor. Stop using it immediately if you notice this.

FAQ

Why won't my garage door open with the remote but the wall button works?

This usually points to the remote itself, dead batteries, a lost pairing, or interference, rather than the opener or door. Testing the wall-mounted control panel first is the fastest way to confirm whether the problem is the remote or the opener unit.

Why is the light on my garage door opener blinking and the door won't move?

A blinking light almost always means the safety sensors near the floor are misaligned, blocked, or dirty. Wipe both sensor lenses, make sure nothing is in the beam path between them, and check that both are pointed directly at each other.

Can a power outage cause a garage door to not open?

Yes, in two ways: the opener itself has no power, or the door was manually disconnected from the opener using the release cord during the outage and needs to be reconnected. Check both before assuming a mechanical failure.

How do I tell if a garage door won't open because of a broken spring?

Look at the spring above the door (or springs, on a two-spring system) for a visible gap in the coil, or listen for a loud bang earlier in the day, which is often the sound of a spring breaking. A door that feels unusually heavy when lifted manually is another sign.

Is it safe to manually open a garage door that won't open automatically?

Only if there's no sign of a broken spring or loose cable. Pull the red release cord to disconnect the opener, then lift slowly and evenly using both hands. If the door feels heavy, uneven, or won't stay up on its own, stop and treat it as a spring issue.