Why Won't My Garage Door Open and How Do I Fix It?

Root cause

Remote controls run on small batteries that die with normal use, and some openers can lose their programmed remote codes after a power outage or reset.

30-second check

Try the wall-mounted control button. If the door opens from the wall but not the remote, this is your cause.

Tools & materials

Fresh remote batteries.

Step-by-step

1. 1 Replace the batteries in the remote and/or keypad.
2. 2 Test the door again.
3. 3 If it still doesn't respond, follow your opener's manual to reprogram the remote (usually a button sequence on the opener unit itself).
4. 4 Confirm reliable operation from a normal distance.

Root cause

Many openers have a 'vacation lock' feature on the wall button that disables remote operation, and most doors also have a red manual release cord that disconnects the door from the motor entirely — sometimes pulled accidentally, or during a power outage.

30-second check

Look at the wall control for a lock icon or indicator light, and look up at the track near the motor unit for the red release cord hanging down.

Tools & materials

None required.

Step-by-step

1. 1 Check the wall control panel for a lock feature and disable it if active.
2. 2 If the red release cord has been pulled, guide the door back down manually.
3. 3 Re-engage the carriage by pulling the release cord toward the door (or per your model's instructions) until it clicks back into the trolley.
4. 4 Test operation with the remote and wall button.

Root cause

Two small sensors near the bottom of the tracks on each side of the door must face each other with a clear, unbroken beam between them. If they're knocked out of alignment or something is blocking the beam, the door's safety system will refuse to close (and on some models, refuses to open as a precaution too).

30-second check

Look at both sensors — a solid light usually means aligned, a blinking or off light usually means a problem. Check for anything (a bike, storage box, leaves) sitting between them.

Tools & materials

A soft cloth.

Step-by-step

1. 1 Clean both sensor lenses with a soft, dry cloth.
2. 2 Remove anything sitting in the beam path between the two sensors.
3. 3 Gently adjust each sensor's bracket so they face each other directly, checking for a steady (non-blinking) indicator light.
4. 4 Test the door's operation.

Root cause

Torsion or extension springs counterbalance the door's full weight using very high mechanical tension. A broken spring is one of the most common reasons a door won't open at all, and it often makes a loud bang — sometimes described as sounding like a gunshot — at the moment it breaks. A frayed or snapped lift cable carries the same risk.

30-second check

The door feels unusually heavy, won't budge, doesn't move evenly, or you heard a loud bang recently — any of these points here.

What a professional actually does

Uses proper winding bars and safety equipment to release remaining spring tension safely; replaces the broken spring (often both springs at once if the door uses a pair, since the second is usually close behind in wear); inspects and replaces cables, pulleys, and tracks as needed; and tests the door's balance before finishing.