Why Your Garage Door Won't Close: 7 Causes (and What Fixes Each)

Why won’t my garage door close?

A garage door that opens but will not close is almost always the safety sensors. The two photo-eyes near the floor are blocked or knocked out of alignment, so the opener reverses and flashes its light to warn you of an obstruction. Clear the beam and square the sensors first.

Federal safety rules require every opener built since 1993 to have these photo-eyes, so a door that refuses to shut is usually the opener doing its job, not a fault. Before you blame the motor or the springs, walk to the sensors at the base of each track and look for anything breaking the invisible beam between them. This single check fixes most no-close calls we run in Ottawa and Gatineau.

If a clean realignment does not fix it, our garage door won’t close repair in Ottawa and sensor repair and alignment get the door secured the same day.

The 7 reasons a garage door won’t close

There are seven common reasons a garage door will not close: blocked sensors, a dirty or sun-glared lens, a close-limit set wrong, a close-force set too low, debris in the track, a bent track or worn roller, and ice under the bottom seal. Six of the seven are quick to spot.

Work through them in order, because the list runs from the most common (sensors) to the seasonal (ice). For a wider symptom map, our full garage door troubleshooting guide covers doors that will not open, reverse, or run noisy too.

1. Blocked or misaligned safety sensors (the #1 cause)

The two photo-eyes sit about six inches off the floor, one at each side of the door. If a bin, a bike tire, a coiled hose, or even a cobweb breaks the beam between them, the opener refuses to close and reverses. A bumped sensor that no longer points at its partner does the same.

Look at the indicator LED on each sensor. Both should glow steady, usually one green and one amber or red depending on the brand. If one is dark or blinking, loosen its wing nut, tilt the sensor until both lights are solid, then retighten. On a LiftMaster or Chamberlain the sending eye is amber and the receiving eye is green; on a Genie both should be a steady glow. Aligned, unobstructed eyes are the fix for most no-close doors.

2. A dirty or sun-glared photo-eye lens

A film of dust, frost, or spider silk on the lens scatters the beam enough that the sensor reads it as a blocked path. Late-day sun shining straight into the receiving eye does the same, which is why some doors will not close at night only, or will not close only at sunset.

Wipe each lens with a soft, dry cloth. If the door fails to close at one time of day, a low sun is washing out the receiver, and a small hood or a slight downward tilt of the sensor cures it. Clean glass and steady LEDs mean the beam is clear.

3. The close-limit setting is off

The close-limit tells the opener exactly where the floor is. If it is set too high, the door stops short and may reverse, thinking it has hit something. If it is set too low, the opener drives the door into the concrete, senses the resistance, and bounces back up.

This is a dial or a programming sequence on the opener head, and it differs by brand and model. Getting it wrong stresses the door and the motor, so it is worth having a technician set it precisely. A correct close-limit lets the door seat gently on the threshold every time.

4. The close force is set too low

The close-force setting controls how hard the opener pushes the door down before it decides something is blocking the path. Set too low, a stiff hinge, a cold spring, or a little track friction reads as an obstruction, and the door reverses partway or just before the floor.

A door that needs more and more force to close is often telling you the hardware is binding, so do not simply crank the force up to mask it. We balance and lubricate the door, then set the force correctly. If the door is heavy by hand or jerks as it moves, that points to a door that reverses before it hits the floor for a mechanical reason.

5. An obstruction or debris in the track

A stone, a chunk of ice, a fallen tool, or a snapped zip tie wedged in the vertical track stops the door at the same spot every time. The opener feels the door stall, assumes an obstruction, and reverses to protect whatever it thinks is underneath.

Run your eye and a flashlight down both tracks from top to floor. Clear anything caught in the channel. If the door consistently stops or jumps at one point and you can see no debris, the track itself may be bent or pinched, which leads to the next cause.

6. A bent track or worn roller catching

A dented track or a cracked, flat-spotted roller drags as the door descends and trips the safety reversal. You will often hear a grind or a thud at the trouble spot, and the rubber or nylon roller may look chipped or wobble on its stem.

Light track dents can sometimes be eased, but a kinked rail or a door that has jumped its channel needs a pro. If the door looks crooked, the rollers have popped out, or a cable has come loose, stop using it and read about off-track garage door repair. Forcing an off-track door makes the damage worse and can be dangerous.

7. Frozen ground seal or ice under the door (Ottawa winters)

In an Ottawa or Gatineau winter, meltwater refreezes on the threshold and a ridge of ice props the door a few inches open. The opener drives down, hits the ice, feels the resistance, and reverses, so the door will not close in cold weather even though nothing is broken.

Chip and sweep the ice off the threshold, then test the close before touching any opener setting. A worn or hardened bottom seal lets water pool and refreeze, so replacing it helps. The same freeze can stick a door shut on the way up, which we cover in our guide to a garage door frozen to the ground.

Why does my garage door close then reopen?

A garage door closes then reopens because the opener’s safety system trips before the door reaches the floor. A misaligned or dirty sensor, a roller catching in the track, a close-force set too low, or ice under the seal all read as an obstruction and trigger the reversal.

Watch where it reverses. If it reverses right at the floor, suspect the sensors or the close-limit. If it reverses partway, suspect a roller, debris, or the close-force. A door that reverses for a mechanical reason rather than a sensor reason is worth understanding before you adjust anything, so see why a garage door reverses before it hits the floor.

Why is the opener light blinking when it won’t close?

A blinking opener light is the machine telling you the safety sensors are blocked or misaligned. The light flashes a set number of times to flag the fault. On most LiftMaster and Chamberlain units, ten blinks or a steady flash means the photo-eyes are not seeing each other.

Different brands and faults use different flash counts, from one to ten blinks, and decoding them points you straight at the problem. Start at the sensors, then check the wiring back to the opener head. For the full table, read what the blinking opener light is telling you. If the codes point to a logic board or motor fault, that is a job for garage door opener and sensor repair.

Can I close a garage door that won’t close, manually?

Yes. Pull the red emergency release cord to disconnect the door from the opener, then lower the door by hand to the floor and engage the manual lock. Only do this if the springs are intact and the door feels balanced, so it does not slam down.

If the door is heavy, drops fast, or feels like it wants to crash when you start to lower it, stop. That points to a broken spring or cable, not a sensor, and a door under those conditions is dangerous to handle by hand. In that case lower nothing and call us. We carry parts on the truck for same-day emergency garage door repair in Ottawa.

How much does it cost to fix a garage door that won’t close in Ottawa?

Our service call is $35 to $85, and it is free with any repair over $250. A sensor re-alignment or limit adjustment falls at the low end. A sensor replacement or opener repair starts at $150 with the common parts already on the truck, so most no-close visits are one trip.

There are no overtime fees, evenings or weekends, and we quote the price before any work starts. If the diagnosis turns out to be a worn opener rather than a quick adjustment, you can read our free service call with any repair over $250 offer and decide on the spot. Most won’t-close jobs are an inexpensive fix once a factory-trained technician confirms the cause.

When this is a job for a factory-trained technician

Call a factory-trained technician when the sensors are clean and aligned but the door still will not close, when the opener flashes a logic-board or motor code, or when the door is off track, crooked, or heavy by hand. Those are not safe DIY adjustments.

Sensor wiring faults, close-limit and force settings, and any spring, cable, or track problem are precise, load-bearing work. HUSH’s lead technician, Omar, is factory-trained, and the company is licensed and insured (WSIB clearance #7421809). Every repair is backed by our 90-day Done-Right Promise. If your door reversed or jammed and will not move at all, do not force it. Call (613) 255-1968 for same-day emergency garage door repair in Ottawa, seven days a week.