Garage Door Won't Close? Sensor, Track, Opener & Spring Triage

A garage door that won’t close is both a security problem and a safety warning. Sometimes it is a simple sensor alignment issue. Other times the opener is reversing because the door is binding, a cable has tension trouble, or the spring system is no longer balanced.

Do not keep pressing the remote over and over. Each failed cycle can bend the top panel, burn out the opener, or pull a cable farther out of position. Use the checks below to separate safe homeowner fixes from problems that need garage door repair.

Fast triage: what the door does matters

What happens	Likely cause	First move
Door starts down, then reverses and opener light flashes	Safety sensor beam blocked, dirty, or misaligned	Check both sensor lights and clear the beam.
Door closes only while holding the wall button	Sensor fault or wiring issue	Clean/align sensors; do not bypass them.
Door hits the floor, then reverses	Close-limit setting too far or floor resistance	Check limit settings and bottom seal obstruction.
Door stops at the same height every time	Travel/force setting, rail issue, or binding track	Stop repeated testing and inspect tracks/rollers.
One side drops or the door looks crooked	Cable, roller, track, or spring balance problem	Do not force it; call for service.
Opener hums, clicks, or bends the top panel	Opener strain caused by door resistance	Stop using the opener until the door is checked.

Step 1: Check the safety sensors first

Most won’t-close calls start with the safety photo-eyes near the floor. They are designed to stop the door if anything breaks the beam.

Check:

• Both sensors should be pointed at each other.
• Both indicator lights should be solid, not blinking or off.
• Nothing should sit in the beam path: boxes, tools, toys, leaves, snow, or a broom handle.
• The lenses should be clean and dry.
• The brackets should not be bent from a mower, bike, trash can, or pet bump.

Wipe the lenses with a dry cloth, move anything out of the opening, and gently adjust the sensors until the lights are solid. Then test the door once.

If the lights will not stay solid, the sensor may have a wiring issue, failed photo-eye, or bracket alignment problem. GarageGuard handles this through garage door opener repair because the sensors are part of the opener safety system.

Step 2: Look for track, roller, and cable danger signs

If sensors look normal, step back and inspect the door itself. Do not put your hands near springs, cables, bottom brackets, rollers, or hinges while the door is under tension.

Stop and call for help if you see:

• one side of the door lower than the other,
• a cable hanging loose, frayed, rusty, or off the drum,
• a roller popped out of the track,
• bent track near the stop point,
• the top panel bending as the opener pushes,
• grinding, scraping, popping, or loud rattling,
• the door starting down at an angle.

Those signs point to cable and roller repair, off-track garage door repair, or spring balance trouble. Forcing the opener through that resistance can make a repair larger and less safe.

Step 3: Check close-limit and force settings carefully

Your opener has travel settings that tell it where the fully closed position is. If the close limit is set too far, the opener pushes the door into the floor, feels resistance, and reverses as if it hit an object.

This is more likely if:

• the door reaches the floor before reversing,
• the bottom seal compresses hard, then the door goes back up,
• the problem started after opener service, a power reset, or someone adjusted settings,
• there is no sensor blink and no visible track obstruction.

Many LiftMaster, Chamberlain, Genie, and Craftsman openers have adjustment buttons or screws on the motor head. Make tiny adjustments only if the door is straight, the sensors are solid, and the track is clear. If the opener keeps reversing, stop before increasing force. A force adjustment can hide a binding door until something breaks.

Step 4: Check the trolley and manual lock

Sometimes the opener runs but the door does not close correctly because the trolley is disengaged or the door is physically locked.

Look for:

• the red emergency release hanging in a disconnected position,
• a manual slide lock engaged on the inside of the door,
• a T-handle lock or latch that did not fully retract,
• a loose opener arm connection,
• an object or ice buildup at the threshold.

Reconnect the trolley only with the door fully closed and balanced. If the door is partway open, crooked, or heavy, do not pull the release cord casually; the door can move unexpectedly.

Step 5: Consider spring balance even if the spring is not snapped

A weakened spring can make the opener reverse during closing because the door is no longer moving smoothly through its full travel. The spring may not be fully broken yet, but the balance can still be wrong.

Warning signs include:

• the door feels heavy by hand,
• the door will not stay halfway open when disconnected safely,
• one side lags during travel,
• the opener strains more than it used to,
• the door reverses after sensors and limits check out,
• a torsion spring looks stretched, rusty, or separated.

Do not adjust springs yourself. If spring balance is the cause, route the call to garage door spring repair so the door can be rebalanced safely.

What to tell the technician before dispatch

A few details make the first visit faster:

• your town and whether the garage is stuck open,
• opener brand if visible: LiftMaster, Chamberlain, Genie, Craftsman, or another brand,
• whether the sensor lights are solid, blinking, or off,
• whether the door reverses immediately, near the floor, or at the same midpoint,
• whether one cable looks loose or one side of the door is lower,
• photos of both safety sensors, both vertical tracks, and the spring above the door.

Those details help separate sensor service, opener diagnosis, cable/roller repair, off-track repair, spring repair, and emergency repair before the truck rolls.

When to call now

Call for same-day garage door service if the door is stuck open, the garage cannot be secured, bad weather is entering, one side is crooked, a cable is loose, the door is off track, the opener is grinding, or the top panel is bending.

GarageGuard handles garage doors that will not close across New York, New Jersey, and Fairfield County CT. Use the call button or quote form on this page, and include what the opener light and sensor lights are doing.

Related services

• If the sensor lights blink or the opener reverses, see garage door opener repair.
• If the door is crooked or a cable is loose, see cable and roller repair.
• If a roller is out or the track is bent, see off-track garage door repair.
• If the door feels heavy or unbalanced, see garage door spring repair.
• If the door is stuck open and cannot be secured, see emergency garage door repair.