Symptom check
The garage door comes down hard and fast
A garage door that slams shut has usually lost spring tension, so gravity closes it instead of the springs easing it down. Stop using it until the springs are checked; a falling door can hurt a person or crush a car hood.
Updated
Stop using the door until the springs are checked
Do not let anyone walk, duck or drive under the door while it moves, and stop using it for now. A door that drops hard has lost part of its counterbalance, and each trip can bring it down faster or finish off a spring that is already cracked. If it is closed, unplug the opener and leave it that way until the springs are checked.
What usually causes it, in order
A door that falls fast has lost the force that slows it, and these are the ways that force goes missing.
- Most common
A spring that has broken
What you notice: One coil on the torsion shaft has a gap in it, or one side spring hangs loose, and the door now lands with a thud.
The repair: Fit new springs wound for the door's weight so it lowers under control again. Garage Door Spring Replacement, from $245
- Common
Springs worn out by age and cycles
What you notice: No gap shows in any coil, yet the door has landed a little harder every month and creeps down when left partway open.
The repair: Fit new springs sized to the door; adding turns to tired steel only shortens what life it has left. Garage Door Spring Replacement, from $245
- Common
A cable that slipped or snapped
What you notice: One side comes down faster than the other and the door lands crooked, with a cable slack near the bottom bracket.
The repair: Hang new lift cables and rewrap the drums so both sides lower at the same rate. Garage Door Cable Replacement, from $185
- Less common
The release cord pulled with the door open
What you notice: The door fell the moment someone pulled the red cord with it up, instead of staying roughly where it was.
The repair: Treat it as a spring problem, because a balanced door holds its place when released, and have the springs measured and replaced. Garage Door Spring Replacement, from $245
- Less common
A close limit set too low
What you notice: The door travels at a normal pace, then hits the slab hard in the last inches as the opener keeps driving it down.
The repair: Adjust the close limit and force so the opener stops as the seal touches down. Garage Door Opener Repair, from $155
Safe checks before you call
Watch from the side of the garage and keep everyone, the dog included, out of the path of the door.
- Check the torsion spring above the opening for a coil that has parted, or the side springs for one hanging loose.
- If the door has to close once more, watch both bottom corners as it lands: one corner hitting first points to a cable.
- See whether the red release cord has been pulled, which leaves the door running on its springs alone.
- Notice whether the slam happens all the way down or only in the last few inches.
- Look at the bottom section and the seal for fresh dents or a flattened spot from the impacts.
Why the door falls instead of lowering
A door falls fast when the springs no longer hold up most of its weight, because the springs, not the opener, decide how gently it comes down.
A balanced door feels light at every height and lowers at the opener's pace. As springs fatigue they give back less lift each year, so the door grows heavier on the way down and the opener has to hold it back through the trolley. When a spring breaks outright, the door can go from heavy to nearly free-falling in a single trip.
A weak spring or a broken one: what the difference looks like
A weak spring looks whole and the door simply lands harder over time; a broken spring shows a gap in the coil, and the change happens all at once.
Both end in the same repair, new springs sized to the door, but the warning differs. A weak spring gives weeks of notice: the door drifts down when left halfway, the opener sounds strained on the way up and the landing gets louder. A broken spring turns the door into dead weight overnight, often after a bang nobody connected to the garage.
Leave the halfway balance test to us on a door that already drops hard. Holding a door that may fall is the risk the test is meant to reveal, and the slam has already given the answer.
Why pulling the release with the door up drops it
Pulling the red release cord with the door open hands its weight to the springs alone, and if they are weak or broken, the door drops.
The federal opener standard calls for a release that lets go with 50 pounds of pull or less, so it disconnects easily, and an unbalanced door comes down the instant it does. Pull the cord with the door closed whenever you can. If the door is up and has to come down, close it with the opener while everyone stands clear.
What a falling door can do to people, pets and cars
A free-falling door carries the weight the springs used to hold, and the reversing system in the opener cannot stop a door it is no longer connected to.
The federal standard for openers built from 1993 on requires the door to reverse within two seconds of contact, but that protection works through the trolley. A door dropping after the release is pulled bypasses it entirely. Children ducking under a closing door, a dog waiting at the threshold and a car parked a foot short are the cases to worry about until the springs are fixed.
Door slams shut: questions and answers
Why does my garage door slam shut instead of lowering slowly?
The springs are no longer carrying most of the door's weight. A balanced door lowers at the opener's pace, but as springs weaken or break, gravity takes over and the door lands hard. A gap in a coil means a broken spring, while a slam with whole springs means tired ones. Either way it needs new springs sized to the door.
Is a garage door that slams shut dangerous for kids and cars?
Yes. A door with failing springs can come down with much of its weight unchecked, and a door dropping after a release pull is outside the reach of the opener reversing system. Keep children and pets clear, park fully inside or fully out, and stop using the door until the springs are replaced.
Why did my garage door slam shut when I pulled the red release cord?
The springs could not hold the door on their own. A balanced door stays near where you release it, so one that drops has weak or broken springs. That fall can bend the bottom section and hurt anyone underneath. Leave the door closed now and have the springs checked before it is opened again.
Can a weak spring make a garage door slam the last few inches?
Yes, because the last stretch is where nearly the whole door hangs from the cables and a tired spring falls furthest behind. The opener then lets it drop onto the slab. A close limit set too low can also drive the door into the floor, so both the springs and the limit get checked.
How can I tell a weak garage door spring from a broken one when the door slams?
Look at the coil: a broken spring has a visible gap, while a weak one looks whole. A weak spring also warns over weeks, the door landing a little harder each time, while a broken spring changes everything in one trip. Both mean replacement, because extra turns on tired steel only shorten its remaining life.
Can I adjust the springs myself to stop my garage door from slamming?
No. Torsion springs store enough energy to break bones, and adjusting them takes winding bars that fit the winding cone and a sure sense of how many turns the door needs. Screwdrivers and makeshift bars slip. Side springs look simpler but hold the same danger, so spring work is the part of the door to hand off.
Where to go next
Nearby service areas
This call comes in from Minnehaha, Salmon Creek, Amboy and the rest of our Washington service area.
Want a price before anyone drives over?
Call and describe what the door is doing, or text a photo of the door and the spring above it. You hear the likely repair and where its price starts, then decide.