If your garage door won't close, the safety sensors are the cause about nine times out of ten — but a blocked track, a wrong limit setting, or the wall lock button can do it too. Here's how to find out why your garage door won't close and fix it.
Work down this list; the first few fix the vast majority of won't-close problems.
If the opener light blinks when you try to close, the sensors are misaligned, dirty, or blocked. Clean the lenses, clear the path, and tilt them until both LEDs glow solid — this is the #1 cause.
A bin, a bike, or debris in the door's path (or in the tracks) will stop it. Make sure nothing is blocking the door or the beam between the two sensors near the floor.
Many wall consoles have a 'lock' or vacation button that disables the remotes and can stop the door. Press it to toggle it off and try again.
If the door starts down then reverses before reaching the floor, the opener thinks it hit something. The down-travel limit needs adjusting on the motor unit so it knows where the floor is.
If the door closes crooked or jerks, a lift cable or spring may be failing. Don't force it — that can worsen the damage or drop the door.
If the sensors won't hold a solid light, the limits won't set, or a cable/spring is involved, we'll fix it fast and safely — call (940) 644-4376.
A garage door torsion spring has a measurable life rating. The industry minimum is 10,000 cycles — one cycle is a single open plus close — and high-cycle springs are sold at roughly 27,000 and 54,000 cycles for doors that get heavy daily use.
| Spring rating (cycles) | Wire / stress | ~Years at 3/day | ~Years at 4/day |
|---|---|---|---|
| 10,000 (industry minimum) | Standard wire | ~9 | ~7 |
| 27,000 (high-cycle) | Thicker, longer wire | ~25 | ~18 |
| 54,000 (high-cycle) | Heaviest wire | ~49 | ~37 |
“Regular greasing or lubrication of springs, as required in the manufacturer’s instructions, will help to maximize spring cycle life.”
DASMA specifically names extreme climate as a factor that shortens spring life. In DFW, springs live through 100°F-plus summers and the occasional hard freeze, and that repeated expansion and contraction is exactly the kind of metal fatigue the standard describes. A little spray lubricant twice a year is the cheapest defense.
Sources: DDM Garage Doors · DDM Garage Doors · DASMA TDS-190
The opener reverses when the safety sensors are misaligned/dirty or the down-limit is set wrong (so it thinks it hit an obstacle). Align and clean the sensors and reset the close limit.
A blinking opener light during a close attempt is the safety-sensor signal: they're misaligned, dirty, or blocked. Clean the lenses, clear the path, and realign until both LEDs are solid.
Most openers let you hold the wall button to override the sensors in an emergency, but you should never leave sensors bypassed — they prevent the door closing on a person or pet. Fix the real cause instead.
Direct sun on a sensor lens can wash out the beam, and cold can stiffen parts so the door binds and reverses. Shade/clean the sensors and check the door's balance and lubrication.
If sensors, limits, or a cable are the problem, we'll fix it fast so your home is secure again. Free quote.