Garage door symptoms
My garage door slams down when it closes
A garage door that slams shut is heavier than its springs can hold, usually because a spring broke or wore out, sometimes because a cable slipped. Keep everyone out of the doorway and have the springs checked before the next close.
Updated
Keep the doorway clear and park the door closed
Do not walk, drive or let children and pets pass under the door while it moves or hangs open. A slamming door has lost the spring force meant to carry its weight, and the next drop can be faster. If it is open, close it once from the wall button while you watch, then unplug the opener until we check the springs; we work across the Portland area.
Likely causes, most common first
A hard landing points to missing lift, so the springs come first, then the parts that connect them to the door.
- Most common
A torsion spring is broken or worn out
The sign: The door gathers speed over its last couple of feet and lands with a thud, and one spring on the torsion tube over the opening may show a two-inch break in its coil.
The fix: Replace the broken or tired spring, both of them on a two-spring door, picked for the weight of this door so it settles to the floor under control. Garage Door Spring Replacement, from $249
- Common
An extension spring snapped or stretched out
The sign: On a door with long springs beside the ceiling tracks, one spring no longer closes up tight when the door is open, or it hangs in pieces from its safety cable.
The fix: Fit a matched pair of new extension springs, with a safety cable running through each one. Garage Door Spring Replacement, from $249
- Common
A lift cable frayed, snapped or jumped its drum
The sign: One side comes down first or faster, the bottom of the door lands crooked, and the cable at that corner looks slack or unraveled.
The fix: Fit two new lift cables, look over the drums and bottom brackets, and level the door before it is rebalanced. Garage Door Cable and Drum Repair, from $189
- Common
The opener trolley came unlatched
The sign: The door fell right after someone pulled the red release cord, or the cord snagged on a ladder or a roof box, and the trolley now rides the rail without the door.
The fix: Relatch the trolley and reset the travel limits, then test the springs, because a door that falls once it is released is out of balance too. Garage Door Opener Repair, from $149
- Less common
The opener's down limit or force is set too far
The sign: The door travels at its usual pace and only bangs in the final inch, while the rail bows or the motor strains for a second after the door touches down.
The fix: Adjust the down travel and the closing force until the door settles gently on the seal, then confirm it reverses on an obstruction. Garage Door Opener Repair, from $149
What you can safely check in two minutes
Do these by eye from beside the opening, with the door closed and your hands off springs, cables and brackets.
- Think back to the last close and note whether the door sped up near the floor, landed crooked, or only banged in the final inch.
- Look at the torsion tube over the opening for a spring with a visible break, or along the ceiling tracks for a side spring hanging loose.
- Check whether the trolley on the opener rail is still latched to the arm that runs down to the top of the door.
- Study each bottom corner from a few feet back for a cable that sags, frays or has unwound, and leave it alone.
- See where the red release cord hangs and whether a ladder, a bike rack or a tall vehicle could catch it.
What the speed of the drop tells you
A healthy door comes down at one steady pace from top to bottom, so the point where yours speeds up tells you which part is failing.
As a sectional door closes, more of it hangs straight down past the curve in the track, so the springs do their hardest work in the last few feet. Weak springs come up short there first, which is why a worn pair shows up as a door that accelerates near the floor.
| How the door comes down | Likely cause |
|---|---|
| Speeds up over the last few feet | Weak or broken springs |
| Tilts, with one corner reaching the slab first | The cable or drum on that side |
| Glides down evenly, then thumps in the final inch | An opener setting, the simplest fix of the three |
Why the red release cord can drop a door
The release cord unhooks the door from the opener, and on a door with weak springs that can let it fall the moment the cord is pulled.
Picture an outage like the January 2024 ice storm. The power fails with the door up, someone pulls the cord to get it closed, and the door comes down on its own. Nothing broke that day; the opener had simply been hiding springs that could no longer hold the door.
Pull the cord only with the door fully closed, and once the power is back, let the opener relatch the trolley. If your door fell when it was released, have the balance checked before anyone counts on the opener to hold it again.
When to stop and call
Stop using the door and call if any of these match what you saw or heard.
- The door hit the slab hard enough to crack the bottom section, bend a hinge or bounce back up.
- One corner landed first and the door now rests out of level.
- A cable at a bottom corner is slack, frayed or wrapped loosely around its drum.
- The opener rail bowed, the trolley jumped, or the arm to the door bent on impact.
- The garage is your only way in or out, so the door has to run every day.
What the repair involves
Most slamming doors are fixed with new springs matched to the door, followed by a balance check and an opener reset.
We measure the old springs, wind the new ones to the real weight of your door, and inspect the cables and drums before anything is rewound, since repeated hard landings fray them. Released from the opener, the door should then hold its place at waist height, and under power it must reverse when it meets a two-by-four laid flat across its path.
Door slamming shut: common questions
Is a garage door that slams shut dangerous to keep using?
Yes, because the springs are no longer controlling its weight on the way down. A door dropping hard can strike a person, a dog or the hood of a car with real force, and every rough landing loosens hinges and wears the cables. Keep it closed and unplugged until the springs and cables have been checked.
Why does my garage door close fine on the opener but slam down when I pull the release?
Because the opener has been holding back weight the springs can no longer carry. Under power, the trolley lowers the door at a fixed pace, so weak springs stay hidden. Once the door is released, gravity takes over and the shortfall shows. That is a balance problem, and adjusting the opener will not solve it.
Can I change the opener settings to stop my garage door from slamming down?
Only when the bang comes in the last inch of travel at normal speed. Then the down limit or the close force is set too far, and a small adjustment fixes it. If the door gains speed over its last few feet, the springs are short of lift, and an opener setting will only mask that.
Why does only one side of my garage door slam down first?
One side dropping first almost always means a lift cable or drum problem on that side. The cable may be frayed, stretched or partly off its drum, so that corner is no longer held up evenly. Stay away from the door and its bottom brackets, because the cable on the other side is still under tension.
What does a garage door that keeps slamming shut do to the bottom section and the opener?
It wears both out faster. Each hard landing jars the bottom section and its seal, works hinge screws loose, and sends a shock up the arm into the trolley and rail. Over a few weeks that can crack the bottom section or bend the arm, which turns a spring repair into a spring and panel repair.
Related pages
Areas we cover for this
Calls about a door slamming shut come in from Sellwood-Moreland, Wilsonville, Brooklyn and every other part of the metro we serve.
Ready to get the door moving again?
Call with the symptom, or text a photo of the door and the opener, and we will name the part and the posted price before anyone drives out.