Garage Door Won't Open? 6 Common Causes

It is the most inconvenient way to start a day: you press the button, the opener hums or clicks or does nothing at all, and the door stays exactly where it is. Before you assume the worst — and before you pay for an emergency call — it is worth knowing that a garage door that will not open is usually one of six problems, and several of them are fixed in minutes with no tools at all. Work through them in order, from the simplest to the most serious, and pay attention to the one cause that means you should stop immediately.

Cause 1: The remote or the keypad

Start with the most boring explanation, because it is the most common. Remote batteries die quietly, and a remote that worked yesterday can stop today. Replace the battery first, and test the wall button inside the garage as well: if the wall button opens the door but the remote does not, the problem is the remote or its signal, not the door. Reprogramming a remote is usually a short process described in the opener manual — typically a learn button on the opener unit and a button press on the remote — and it is worth trying before anything else. Also check whether the opener is locked: many wall panels have a lock or vacation mode that disables remotes deliberately, and it is easily switched on by accident.

Cause 2: No power to the opener

If nothing happens at all — no light, no sound, no movement — the opener may simply have no power. Check that it is plugged in, since vibration can work a plug loose over time, and check the circuit breaker for the garage circuit. A tripped breaker or a tripped GFCI outlet on the same circuit is a quick fix. If the opener has power but the light comes on and the motor does not run, the problem is further down this list. One caution: if the breaker trips again the moment you reset it, stop resetting it and call a professional, because something on that circuit is faulting.

Cause 3: The safety sensors are blocked or misaligned

Near the floor on either side of the door are two small sensors that watch an invisible beam across the opening. If that beam is broken or the sensors are misaligned, the opener will refuse to close the door — and on many models it will also refuse to open it, or will start and immediately reverse. This is a safety system, not a fault, and it is easily disturbed: a box nudged against a sensor, dust or cobwebs over a lens, a sensor knocked out of line by a bicycle or a trash can. Wipe both lenses, clear the area, and check that both sensors sit level and facing each other — most have a small indicator light that turns steady when they are aligned. If the door still refuses to move after that, the sensors themselves or their wiring may need a technician.

Cause 4: The door is disconnected from the opener

Every opener has an emergency release cord, usually red, hanging from the trolley on the rail. Pulling it disconnects the door from the opener so it can be moved by hand — useful in a power cut, and easily pulled by accident, by a child, or while moving something tall through the garage. If the opener motor runs but the door does not move, look up: if the trolley is separated from the door arm, that is your answer. Re-engaging it is usually a matter of running the opener until the trolley reconnects, or pulling the cord toward the door and then operating the opener, following your manual. If the door feels extremely heavy when you try to lift it by hand, stop — that heaviness points to the next cause.

Cause 5: A broken spring

This is the serious one, and it is the reason for the warning above. Garage door springs do the real lifting: they counterbalance the full weight of the door, and the opener only guides it. When a torsion spring breaks — often with a loud bang that sounds like something fell in the garage — the door becomes enormously heavy, sometimes hundreds of pounds of dead weight, and the opener cannot lift it. You may see a visible gap in the spring above the door, or the door may lift a few inches and stop. Do not try to force it, do not try to lift it alone, and never attempt to replace a spring yourself: a wound torsion spring stores enough energy to cause severe injury, and spring replacement is strictly professional work. A broken spring is also the most common reason a door that worked fine yesterday will not move today, because springs fail suddenly at the end of their life.

Cause 6: Track, rollers or a bent door

The last common cause is mechanical: a roller that has popped out of its track, a track bent by an impact, debris jammed in the track, or a door panel that has warped or been hit. Signs include grinding or scraping noises, a door that moves unevenly or tilts to one side, or a visible bend in the track. Clear obvious debris and look for a roller sitting outside its track, but do not try to bend a track back into shape or force a jammed door — forcing it can pop more rollers out or damage the panels, turning a repair into a replacement. A door that moves crookedly is also a safety issue: it can come off its tracks entirely.

What to check, in order

• Replace the remote battery and try the wall button.
• Confirm the opener has power — plug, breaker and GFCI.
• Wipe the safety sensors, clear the area around them, and check their alignment lights.
• Look for the disconnected trolley and the red release cord.
• Look at the springs above the door for a visible break or gap.
• Inspect the tracks and rollers for debris, bends or a popped roller.
• Never force a heavy or jammed door, and never touch a broken spring.

The bottom line

Half of all stuck garage doors are a battery, a plug, a sensor or a disconnected trolley — five minutes and no bill. The other half are springs, tracks and motors, and those are professional repairs, with a broken spring at the top of the do-not-touch list. Work the simple checks first, respect the stop signs, and if the door is heavy, crooked or spring-broken, get a garage door pro out — see Garage Door Safety: 7 Checks to Do Before Something Breaks.