Garage Door Won't Close

A garage door won't close for one of four reasons, and they are worth separating before you start adjusting anything: the safety photo eyes think something is in the way, the opener's travel limits are set wrong, the opener's force settings are too sensitive, or the door is physically binding somewhere in the track. Only the last one is genuinely a repair. The other three are settings, and the fix is usually a screwdriver and a clean cloth.

One clue narrows it enormously: what the door does. A door that never moves at all is a different problem from a door that travels partway and reverses, which is different again from a door that lands and immediately rolls back up. Note which of those you have before reading further.

Step 1: Photo Eyes — the Reason a Garage Door Won't Close Most Often

Federal safety requirements have put a pair of photo eyes on every residential opener sold since the early 1990s. They sit low on each side of the opening, roughly four to six inches off the slab, and they project an infrared beam across the doorway. Break that beam while the door is closing and the opener reverses immediately. Break it before the door starts and the opener refuses to close at all — most units signal this by flashing the overhead light or clicking without moving.

Check them in this order. Look for physical obstructions first: a recycling bin, a coiled hose, a surfboard leaned against the jamb. Then look at the LEDs. Nearly every brand lights one steadily on the sending unit and one on the receiving unit; a receiver LED that is dark, dim, or flickering means the beam is not landing. Wipe both lenses with a dry cloth — in Oceanside garages within a mile or so of the water, salt haze and fine grit build a film on those lenses faster than most homeowners expect, and a hazed lens behaves exactly like a misaligned one.

If the lenses are clean and the LED is still out, loosen the bracket wing nut and pivot the sensor in small movements until the light goes solid, then tighten. Finally, check the wire. The thin bell wire running from the sensors to the motor head is easy to nick with a shovel or a bike handlebar, and a partly severed conductor produces an intermittent fault that comes and goes with temperature — which is why some doors misbehave only in the cool morning marine layer and work fine by afternoon.

Step 2: Travel Limits and Force Settings

If the photo eyes check out, the next suspect is the opener's own idea of where the floor is. The down-limit setting defines the stopping point. Set too high, the door halts a few inches short and sits there. Set too low, the opener continues driving after the bottom seal has hit concrete; the cables go slack on the drums, the opener senses the sudden change in load, and the safety logic reverses the door back to full open. That second failure mode is frequently mistaken for a sensor problem.

Older chain drives use two adjustment screws on the side of the motor head, marked up and down, and roughly one full turn equals two inches of travel — so adjustments are made a quarter turn at a time. Newer units use programming buttons and a learn sequence, and the procedure differs by manufacturer; the label on the motor head or the inside of the light lens usually gives it. Force settings are separate controls and should be adjusted only after travel is correct, because raising force to mask a binding door defeats the entire reversing safety system.

Step 3: When a Garage Door Won't Close for Mechanical Reasons

Now disconnect the opener with the red release cord and move the door by hand with the opener idle. A healthy door glides through its full travel with moderate effort and stays put when you stop it around waist height. If it grinds, catches at a specific point, or slams down when released, the problem was never electronic.

Common mechanical causes: a roller with a seized bearing that skids instead of rolling — extremely common on coastal homes where uncoated steel rollers corrode; a track section dented by a bumper or a ladder, pinching the roller at one spot; a bent bottom bracket; or debris packed into the lower track. If the door binds badly or one side hangs lower than the other, stop and treat it as an off-track condition rather than something to force. And if the door slams down when you release it at waist height, the counterbalance is gone — see our guide on what to do when a garage door spring breaks. Spring work is not a DIY task at any experience level; the stored energy in a wound torsion spring is genuinely dangerous.

Frequently Asked Questions

Worked the list and the door still refuses? At that point you are into logic-board, wiring, or hardware territory, and a technician will diagnose it faster than another afternoon of guessing. Sensor and limit adjustments are also among the least expensive visits a garage door technician makes — far below what a panel or opener swap involves.