--- title: "Garage Door Slams Shut or Closes Too Fast" page_title: "Garage Door Closes Too Fast or Slams Shut? What Broke" description: "A door that drops or slams has lost the counterbalance holding it back. What causes it, what the bang at the end of travel means, and why it can't wait." url: "https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-closes-too-fast/" type: "door-symptom" published: "2026-09-01T19:27:24Z" modified: "2026-09-01T19:35:21Z" publisher: "Farnsworth Garage Door Service, Mesa, AZ" phone: "(602) 935-9766" --- # Garage Door Slams Shut or Closes Too Fast Descent speed on a garage door isn't controlled by the opener. It's controlled by the springs. The counterbalance stores nearly the door's whole weight, and on the way down it's working against gravity the entire time — resisting, not assisting. That's why a healthy door comes down at a measured, almost lazy pace regardless of what the motor is doing. Remove some of that resistance and the door starts winning the argument with the springs, and it comes down faster. Remove all of it and the door isn't closing, it's falling. This is the one symptom in this section where we'd genuinely rather you stopped reading partway and made the call. A door that drops is the failure mode that hurts people, and it's the one that gives the least notice between the first fast close and the one that matters. ⚠ **High risk — leave this to a technician** Involves high-tension components or the door’s full weight. This is where people get badly hurt. This is general guidance based on what we see on service calls — it isn’t a substitute for someone looking at your actual door. Every door is a little different, and if anything here feels beyond what you want to take on, stop and [give us a call](tel:+16029359766). ## Stop using the door and keep the opening clear If the door is coming down noticeably faster than it used to, dropping the last stretch, or landing hard enough to shake the panel, stop operating it now. That applies whether it's happening every time or only occasionally — an intermittent fast close is a fault that hasn't finished developing, not a fault that's going away. A residential sectional door weighs 130 to 350 pounds. A door coming down under partial counterbalance has real energy behind it by the time it reaches the floor, and contact reversal is a system for stopping a door that meets something, not one for stopping a door that's falling. Leave the door closed if it's closed. Unplug the opener at the ceiling so nobody can operate it, including by remote or app. Keep children, pets and vehicles out of the opening entirely, and don't leave the door parked partway open for ventilation or for anything else. A door that drops rather than closes is worth [24-7 emergency garage door repair](https://farnsworthgarage.com/garage-door-repair-service-installation/24-7-emergency-garage-door-repair/) instead of a wait until Monday. [Call (602) 935-9766](tel:+16029359766) Start Here ## What to check in the next 10 minutes Four things to establish, and none of them require touching the door. 1. 1 **Separate a fast descent from a hard landing** These get described the same way and mean completely different things. A door that travels the whole way down at speed has lost counterbalance. A door that travels normally and then bangs at the very bottom is usually an opener setting driving it into the concrete. Watch one close from a safe distance and decide which you have. You’ll know it worked when: You can say whether the speed is wrong throughout or only the last few inches are loud. 2. 2 **Check the spring above the door** A clean gap in the coil, an inch or two wide, means there's no counterbalance at all and the answer is already found. That check takes ten seconds with a flashlight and it's the most consequential thing on this list. You’ll know it worked when: You've looked at the coil and can say whether it's continuous. 3. 3 **Look at whether the trolley is engaged** If the emergency release has been pulled and never reconnected, the door isn't attached to the opener and nothing is metering its descent except the springs. Very common after a storm evening. Worth ruling out before assuming the worst. You’ll know it worked when: You can say whether the trolley is latched to the opener's carriage. 4. 4 **Watch whether it comes down level** Stand well back and look at the bottom edge. A door dropping level has a counterbalance problem. A door where one corner runs ahead has lost support on that side — a cable or a drum — and that's a different and equally urgent fault. You’ll know it worked when: You know whether the drop is even across the door. ## Fast all the way, or loud at the end? The single most useful distinction on this page, and most people can answer it from watching one close. Does the door travel **too fast for its whole descent**, or does it come down normally and then **land hard**? Fast for the whole descent **What that means:** The counterbalance isn't holding it back. This is the serious version — springs have failed or lost significant lift, and the door is being carried down by its own weight with less and less resisting it. **Where to go next:** Stop using the door and read causes 1, 2 and 4. Normal speed, then a bang at the bottom **What that means:** Usually the opener's down travel limit set past where the floor actually is, so the door seats and the opener keeps driving. Annoying and hard on the bottom section, but a different category of problem — and it's covered properly on the opener travel limits page. **Where to go next:** Read cause 7. It only does it sometimes **What that means:** Treat it as the first answer. Intermittent means a fault that's still developing rather than one that's resolving itself, and the intermittent phase is the warning rather than the reprieve. **Where to go next:** Stop using the door and call. If you're not sure which you have, don't stand there running the door to find out. Watch one cycle from well back, or leave it and describe what you saw when you call. ## Which version are you seeing? Six presentations, and they carry different levels of urgency. Comes down fast for the whole travel and lands hard Substantial loss of counterbalance. The door is largely falling rather than closing. [Jump to that fix ↓](#cause-2) Dropped suddenly, with a bang from above beforehand A spring broke. There is no counterbalance at all and the door is in free descent. [Jump to that fix ↓](#cause-1) Only fast when the door is on manual The trolley is disengaged, so nothing is metering the descent. Reveals a counterbalance the opener had been covering for. [Jump to that fix ↓](#cause-3) Travels normally then bangs the last inch Opener travel setting rather than counterbalance. Different problem, much smaller. [Jump to that fix ↓](#cause-7) One corner drops ahead of the other A cable or drum has let go on that side. Not a spring fault, and it's heading straight for an off-track door. [Jump to that fix ↓](#cause-5) Catches, holds for a moment, then breaks free and drops Something binding is holding the door temporarily, and releasing it all at once. Deceptive and dangerous. [Jump to that fix ↓](#cause-6) Springs alongside the tracks, one side lets go Extension springs act per side, so one failing produces a fast, uneven descent. [Jump to that fix ↓](#cause-4) ## What normally slows the door down People assume the opener lowers the door. It doesn't, in any meaningful sense — it's a positioning device attached to a load that's already nearly weightless, and it's along for the ride in both directions. What actually controls descent speed is the counterbalance working in reverse. On the way up, the springs assist. On the way down, they resist — they're being wound back up by the door's own weight, and that resistance is what stops the door from simply falling. A healthy door comes down at a steady, moderate pace because the springs are absorbing nearly all of gravity's contribution the entire way. Take away part of that resistance and the arithmetic shifts. If the springs are producing, say, most of the lift they used to, the leftover weight is what accelerates the door, and it accelerates for the full height of the opening. That's why the last few feet are always the fastest — the door has been picking up speed the whole way. Take away all of it — a broken spring — and there's nothing resisting at all. At that point the only things between the door and the floor are the opener's drive train and whatever friction the rollers happen to provide, and neither is a braking system. The one bit of good news is that this symptom is loud, visible and impossible to ignore, which is more than can be said for most of the ways a counterbalance fails. **Counterbalance resistance** The springs being wound back up by the door's weight on the way down. What sets descent speed. **Free descent** A door coming down with no counterbalance resisting it. What a broken spring produces. **Down travel limit** The opener setting for where the floor is. Set past it and the opener drives the door into the concrete. **Contact reversal** The door reversing when it physically meets something. Designed for a door moving normally, not one that's falling. The short version: descent speed is a direct readout of how much counterbalance you have left. It's the most honest gauge on the door, and it only reads one direction. ## How urgent is yours Match the behavior. Most of this table says the same thing, and that's not padding. | What you’re seeing | Most likely cause | How urgent | Who should fix it | | --- | --- | --- | --- | | **Fast the whole way, gap visible in the spring coil** | Broken spring — no counterbalance at all | Call now | Call a pro | | **Noticeably faster than it used to be, coil intact** | Springs have lost significant lift | Stop using it | Call a pro | | **Drops the last few feet after starting normally** | Partial counterbalance — the door accelerates as it descends | Stop using it | Call a pro | | **Only fast when disconnected from the opener** | The opener had been masking a counterbalance shortfall | Stop using it | Call a pro | | **One corner leads the drop** | Cable or drum has released on that side | Stop using it | Call a pro | | **Catches, then breaks free and drops** | Something binding is holding the door and letting go all at once | Stop using it | Call a pro | | **Extension springs, one side broken** | Per-side counterbalance loss — fast and uneven | Stop using it | Call a pro | | **Normal travel, hard bang at the very bottom** | Down travel limit set past the floor | Fix this week | Either — call us if unsure | | **Bottom section is now bent or cracked** | Repeated hard landings have damaged the panel | Fix this week | Call a pro | | **Only happens occasionally** | A fault that hasn't finished developing | Stop using it | Call a pro | | **Door came down on its own with nobody operating it** | Counterbalance has failed to the point the door can't stay up | Call now | Call a pro | ## What’s actually causing it These are ordered the way we work through them on a real service call — cheapest and most common first, so you don’t start by replacing a part that was never the problem. 1 ### A spring has broken and the door is in free descent High risk — call a technician The most serious version and the easiest to confirm. A broken torsion spring shows a clean gap in the coil above the opening, roughly an inch or two, as though a section had been removed. With that gone there's no counterbalance resisting anything. The door doesn't close — it falls, and the only things slowing it are the opener's drive train and whatever friction the rollers contribute. Neither is a braking system, and the drive train in particular is a nylon gear that was chosen precisely because it's cheap to replace. What makes this the urgent one is that the descent is the dangerous part. A door with a broken spring that's currently closed is stable and harmless. A door with a broken spring that's raised, or that gets raised, is a few hundred pounds with a clear route to the floor. The full picture on broken springs is covered on its own page. What matters here is the instruction: don't open it again. How you can tell: A visible gap in the coil, usually with a bang somebody in the house remembers. The door came down markedly faster than normal, or came down entirely on its own. **Where to stop:** Leave the door closed, unplug the opener, and keep everyone out from under the opening. Don't pull the emergency release — on a raised door that removes the last thing holding it, and on a closed one it accomplishes nothing. Keep it that way until the [garage door spring repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-spring-repair/) is booked. 2 ### The springs have lost enough lift that gravity is winning High risk — call a technician The gradual version, and the one that reaches this page after passing through several milder symptoms first. Springs lose lift as they fatigue. Long before one breaks, the counterbalance is producing measurably less resistance than it used to, and on the way down that shows up directly as speed. The door still opens fine — the opener has authority to spare — so nobody connects the fast close to anything until it gets alarming. The characteristic pattern is acceleration. The door starts down at something like its usual pace and picks up speed all the way, because the leftover weight is pulling on it for the full height of the opening. By the last few feet it's moving considerably faster than it ever did, and it lands hard. Repeated hard landings do their own damage. The bottom section takes the impact every time, and a section that has been slammed into concrete a few hundred times develops bends and cracks that eventually become their own repair. One variant worth separating out, because the fix is different: sometimes the springs never had the lift in the first place. Winding a torsion spring means applying a specified number of turns, and DASMA names coming up short as a real failure mode — “insufficient torque can present problems, as well, resulting in a door drifting down from its open position over time.” A door that has drifted down from fully open since the day the springs went in, and that closes fast on top of it, is describing turns rather than fatigue. The tell is history: fatigue gets worse from a known baseline, an under-wound door was like this from the start. How you can tell: Descent has been getting faster over months. The door lands harder than it used to. It probably stopped holding position when raised by hand some time before this started. If instead it has drifted down from fully open since the springs were last replaced, suspect the winding turns rather than fatigue. **Where to stop:** Don't wait for it to break. This symptom means the springs are producing significantly less than they should, and the gap between a fast-closing door and a door with no counterbalance at all is measured in cycles. 3 ### The door isn't connected to the opener Hands-on — moderate risk Worth ruling out early, because it can produce a startlingly fast descent on a door whose springs are only moderately tired. When the emergency release is pulled and never re-engaged, the door is on the springs alone. The opener's drive train had been contributing a small amount of drag and a lot of positional control, and without it the door does whatever the counterbalance tells it to. On a door with healthy springs that means a controlled descent. On a door with springs that have quietly fallen behind, it means the shortfall is suddenly visible. This is genuinely common after a storm evening, when people pull the release to work the door by hand and never reconnect it. Reconnecting is straightforward, and the method plus the safe sequence are covered on the won't-stay-up page rather than repeated here. The important part is what happens after you reconnect. If the door then closes normally, the trolley was the whole issue. If it still comes down fast, you've just confirmed a counterbalance problem the opener had been covering for. How you can tell: The release cord hangs slack and the carriage on the rail looks separated. The opener may run without moving the door at all. **Where to stop:** Reconnect with the door closed, never raised — on marginal springs the door can drop the instant the carriage catches. And if it still closes fast afterward, that's a result, not a failed repair. 4 ### One extension spring has failed High risk — call a technician Doors with extension springs — the long ones running back alongside the horizontal tracks — behave differently here, and worse in one specific respect. Extension springs act independently on each side. If one parts, that side loses its counterbalance entirely while the other keeps working, so the door comes down fast *and* unevenly. It drops on the failed side, racks in the opening, and the loading on the rollers and track goes somewhere they weren't designed to take it. There's a second concern specific to this setup. A stretched spring under load that parts can travel along its own length, which is what safety containment cables are for — a steel cable threaded through the middle of each spring and anchored at both ends, whose only job is to catch the pieces. Plenty of older Valley doors don't have them, either because they predate the practice or because somebody replaced springs and left them out. How you can tell: Springs alongside the upper tracks rather than a shaft above the door. One visibly broken or slack. The door drops on that side and twists as it goes. **Where to stop:** Stop using the door and keep out of the garage rather than just out of the opening. If there's no containment cable, there's loose spring hardware at head height, and that's separate from the door itself. 5 ### A cable or drum has released on one side High risk — call a technician If the door drops with one corner running ahead of the other, this isn't a spring fault and it's arguably the most urgent thing on the page. What that describes is a lift cable that has come off its drum, snapped, or a drum that has slipped on the shaft. That corner has lost its support, so it falls faster than the supported side, and the door twists in the opening as it goes. Every occurrence drives the rollers into the track sideways, and the door is now one or two cycles from leaving its rails entirely. It's worth being explicit, because the mistake gets made constantly: a broken torsion spring does not cause a one-sided drop. Both springs on a two-spring door sit on the same shaft and act as one counterbalance, so a spring failure makes the door uniformly fast, not lopsided. One-sided means cables and drums. How you can tell: One corner clearly leading. The door looks twisted mid-travel. Often a slack cable visible, or one sitting outside its drum groove. **Where to stop:** Unplug the opener and don't run the door again, even to see if it repeats. This is the state immediately before an off-track door, and re-railing one is a considerably longer repair than putting a cable right. 6 ### The door catches, then breaks free and drops High risk — call a technician The deceptive one, because it presents as an intermittent fault on a door that's otherwise behaving. Something is binding — a roller with a seized bearing, a bent track section, a hinge that has worked loose, debris packed at one point in the vertical track. On the way down the door meets that resistance and hesitates. For a moment the friction is holding weight the springs no longer are. Then the door overcomes it, all at once, and drops from that point with everything it has been accumulating. What makes this genuinely worse than a steady fast close is the surprise. A door that's consistently fast at least tells you what it's going to do. A door that hesitates and then lets go does the dangerous part without warning, and it does it at a different height each time. It also almost always means two faults rather than one, since a healthy counterbalance would have held the door regardless of what the friction did. How you can tell: The descent stutters, pauses, or catches at a point in the travel, then the door drops. Often a scraping or clunking noise at the moment it catches. **Where to stop:** Don't try to find the bind by cycling the door repeatedly. Every attempt is another uncontrolled drop, and the mechanism you'd be looking for is the same mechanism that makes the drop dangerous. 7 ### It isn't the descent — it's the landing Hands-on — moderate risk Worth separating out, because it brings a lot of people to this page and it's a much smaller problem. If the door travels at a normal speed and then bangs hard at the very bottom, what you're usually hearing isn't a falling door. It's the opener's down travel limit set past where the floor actually is. The door seats on the concrete, the opener hasn't reached the position it was given, so it keeps driving — and the noise is the motor loading the door into the slab. Two things follow from that. First, it's an opener setting rather than a counterbalance failure, and it's covered on the opener travel limits page. Second, it's still worth correcting: the bottom section takes that load every cycle, and repeated hard seating is how a section ends up bent or cracked. The tell that separates it cleanly is the speed of everything before the bang. Normal travel plus a loud finish is this. Fast travel plus a loud finish is the rest of this page. How you can tell: The descent looks like it always has. The noise is confined to the last inch, and often the door bounces slightly or reverses after touching down. The fix 1. Watch one full close from outside the opening and time it against how it used to sound, focusing on the travel rather than the landing. 2. Check the bottom seal — a hardened or missing seal removes the cushion and makes a normal landing sound much worse. 3. Look at the bottom section for bends, cracks or a bowed profile, since repeated hard seating shows up there first. 4. If the door bounces or reverses after touching down, that's the classic signature of a down limit set past the floor. 5. Follow the adjustment method on our opener travel limits page rather than guessing at the screws. 6. Whatever gets adjusted, finish with the safety reversal test — a 2x4 laid flat on the concrete under the center of the door. You’ll know it’s right when: The door seats without the opener straining afterward, the bang is gone, and contact reversal still works. **Where to stop:** If the travel itself is fast rather than just the landing being loud, none of this applies and the adjustment would be papering over a counterbalance problem. Check the speed before you touch a setting. ## What you’ll need if you’re doing this yourself - **A flashlight** — checking the coil, the cables and the trolley all depend on it, and all three are in shadow - **Somewhere to stand well back** — watching one cycle from outside the opening is the entire diagnostic, and it's the safest version of it - **Your phone** — a video of one close tells us more in five seconds than a paragraph of description, and you can film it from a distance ## Things not to do — and why × Don't keep running the door to see if it does it again Every cycle is another uncontrolled descent with a few hundred pounds behind it. Confirming an intermittent fault isn't worth the repetitions, and you already have enough to make the call. × Don't try to slow the door by hand or hang on it Your weight isn't a braking system. A door coming down under partial counterbalance has real momentum by the lower half of the travel, and being in its path is the specific thing to avoid. × Don't park the door partway open Mid-travel is where the counterbalance has the least margin and where the door has the furthest to accelerate. On a door already closing fast, that's the worst position to leave it in. × Don't rely on the safety sensors to catch it Photo eyes stop a door that's operating normally when something enters the beam. They aren't a restraint, and they were never designed to arrest a door that's descending under its own weight. × Don't rely on contact reversal either It's a system for a door meeting an obstruction during controlled travel. A falling door is a different problem, and treating reversal as a backstop for it is the wrong mental model. × Don't adjust the opener's down force or travel to fix a fast close Neither setting controls descent speed — the springs do. All you'd change is how hard the opener pushes at the end, which affects the landing and nothing else, while removing safety margin. × Don't let anyone use the garage until it's sorted This is the one symptom on the site where the hazard is immediate rather than eventual. Keep children and pets out of the garage, not just out of the doorway. × Don't ignore a bottom section that's started to bend It's the record of how many hard landings have already happened. A cracked or bowed bottom section is a separate repair, and it's evidence the underlying fault has been running for a while. ## Why this bites harder in a Valley garage The mechanics are climate-independent. The circumstances around them aren't, and a few things about how garages get used here raise the stakes. Across Mesa, Gilbert and Queen Creek the garage is attached to the house and functions as the household's main door. That means the space under a falling door is also the space where kids come in from the car, where the dog waits, and where somebody is usually carrying something with both hands. - **Attached garages put the opening on the household's main route** — the area under the door isn't an outbuilding, it's the hallway, and it's busy at exactly the times the door gets used. - **A hardened bottom seal removes the last bit of cushion** — seals here go stiff from UV and heat rather than tearing, and a stiff seal turns a firm landing into a hard one and passes the shock into the bottom section. - **Doors left open are what DASMA actually flags** — its spring cycle-life sheet points at the exposure a door gets from standing open for long stretches, and advises keeping doors closed where possible in extreme-heat climates. Not the same as claiming Phoenix heat cooks a spring, and we won't say that. A fast close is one of the later symptoms of lift that has been declining for a while. - **Monsoon outages put doors on manual** — pulling the release to work the door by hand during a storm evening removes the opener from the equation, and on tired springs that's when the descent gets frightening. - **Hot slabs and repeated impact** — a bottom section landing hard on 140-degree concrete a few hundred times is how bends and cracks develop in a panel that isn't otherwise damaged. ## Making sure a door never gets to this point This symptom is late in the sequence, and everything that prevents it happens well upstream. - **Test whether the door holds position twice a year** — losing hold comes before closing fast, and it's the earlier and much cheaper warning. The method is on our balance-test page. - **Pay attention to descent speed as a habit** — watch one close occasionally. A door that seems quicker than it used to be is reporting something real. - **Replace the bottom seal when it stops being pliable** — it's the cushion at the end of the travel, and here it hardens years before it looks damaged. - **Keep rollers and hinges lubricated and free** so nothing can catch mid-travel and then let go all at once. - **Reconnect the trolley after every outage** — with the door closed. A door left on manual is a door with nothing metering its descent. - **Act on a slow decline rather than waiting for a fast one** — a door getting heavier or losing hold is the same fault at a stage where it's still a scheduled repair. - **Keep the opening clear as a household rule** — not because anyone expects a door to drop, but because the cost of that assumption being wrong is not recoverable. ## How a door gets to closing this fast This is late in a sequence rather than the start of one, and each step here genuinely causes the next. [The springs lose lift and the door stops holding position](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-wont-stay-up/) → With less resistance on the way down, the door starts closing fast *(you are here)* → [Repeated hard landings bend and crack the bottom section](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-section-cracked/) → [Impact loading works cables loose and one leaves its drum](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-cable-came-off/) → [With one corner unsupported, the door jumps the track](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-off-track/) The first step is the one that gives you months of warning. By the time the door is closing fast, the warning period is over and the useful action is to stop using it. ## How we handle a door that's coming down fast This call gets sequenced around making the door safe first and diagnosing second, which is the opposite of most visits. What we do on a visit for this - Assess the counterbalance before the door is operated at all - Get the door into a controlled, secured position rather than testing it under power - Check the spring for breakage and measure what lift the intact springs are actually producing - Check both cables and both drums, since one-sided descent is a different fault with different parts - On extension setups, check for safety containment cables and fit them if they're missing - Look for binding points that could hold the door and release it mid-travel - Inspect the bottom section, bottom brackets and rollers for damage from repeated hard landings - Check the bottom seal, since a hardened seal both worsens the impact and hides the wear - Restore the counterbalance to match the door and confirm descent speed by hand - Set the down travel limit properly and run the safety reversal test the way UL 325 requires You'll get a written quote before any work starts. The service that fixes this When you want it handled rather than diagnosed, this is the page for it: [garage door spring repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-spring-repair/). Depending on what you find, [24-7 emergency garage door repair](https://farnsworthgarage.com/garage-door-repair-service-installation/24-7-emergency-garage-door-repair/) may be the closer fit. ## What this one turns on The range here is set almost entirely by how long the door has been doing it, which is unusual — most symptoms are priced by the part. - **Whether the counterbalance has failed or just faded** A broken spring and a set of tired springs are different parts and different urgency, though both end in a spring replacement. Both end in a [garage door spring repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-spring-repair/); what differs is how long it can reasonably wait. - **Whether cables or drums are involved** A one-sided drop is cable and drum work rather than spring work, and it usually brings track and roller inspection with it. - **Bottom section condition** Every hard landing loads the lowest panel. A bent or cracked section is a separate repair and one of the more expensive consequences of leaving this. - **Bottom bracket and roller damage** Impact travels into the corners of the door. Brackets and rollers at the bottom take the worst of it and are cheap parts caught early. - **Containment cables on extension setups** If they're missing, fitting them is inexpensive while the springs are being replaced anyway, and effectively a separate job later. - **How many hard closes it has done** This is the real variable. A door caught after a few is a spring job. A door caught after months is a spring job plus a panel, plus brackets, plus track. You'll get a written quote before any work starts. If you're due anyway, our full tune-up is $39.99 — same price in every city we serve. ## Still stuck? We’ll come take a look. Same-day service is our standard across Mesa, Gilbert, Chandler, Queen Creek, Scottsdale, Phoenix, and the rest of the Valley. [Call (602) 935-9766](tel:+16029359766) [Book an appointment](https://farnsworthgarage.com/book-appointment-now/) Due for a check-up while we’re out? Our full tune-up is **$39.99** — same price in every city we serve. ## Related problems we see with this one [Garage Door Won’t Stay Up Read the fix →](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-wont-stay-up/) [Garage Door Spring Broke Read the fix →](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-spring-broke/) [How to Test Garage Door Balance Read the fix →](https://farnsworthgarage.com/garage-door-troubleshooting/how-to-test-garage-door-balance/) [Garage Door Cable Came Off the Drum Read the fix →](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-cable-came-off/) ## Questions we get asked about this ### Why does my garage door close so fast? Because the springs aren't resisting it the way they should. Descent speed is set by the counterbalance, not the opener — on the way down the springs are being wound back up by the door's weight, and that resistance is what keeps the door moving at a moderate pace. Less lift means less resistance, and the door accelerates for the full height of the opening. ### Is a garage door that slams shut dangerous? It's the failure mode we'd treat most seriously on a residential door. A sectional door weighs 130 to 350 pounds and has real momentum by the lower half of its travel. Photo eyes and contact reversal are designed for a door operating normally, not for arresting one that's coming down under its own weight. ### Can I slow my garage door down with the opener settings? No, and it's worth knowing why the answer is so definite. Force and travel settings control how hard the opener pushes and where it stops, not how fast the door falls. Descent speed lives with the springs. Adjusting the opener would change the landing and spend safety margin without touching the actual cause. ### My garage door drops the last few feet. What's wrong? That's the classic signature of partial counterbalance. The door starts at something like normal speed and picks up momentum all the way down, so the last stretch is the fastest — the leftover weight has been pulling on it for the whole descent. It means the springs have lost significant lift, and the door shouldn't keep being used. ### The door comes down normally but bangs at the bottom. Is that the same thing? No, and it's a much smaller problem. A normal descent with a hard landing is usually the opener's down travel limit set past where the floor actually is, so the door seats and the opener keeps driving into the concrete. Check whether the travel itself is fast before assuming the worst — that's the distinction that matters. ### Why did my garage door fall down on its own? Because there was nothing holding it up. That means a broken spring in most cases, or a lift cable that has parted or come off its drum. Either way the counterbalance stopped carrying the door's weight, and gravity did the rest. Leave the door where it landed, unplug the opener, and keep everyone out of the garage. ### Will the safety sensors stop a falling garage door? They aren't designed to. Photo eyes tell the opener to reverse when something breaks the beam during normal operation, and contact reversal stops a door that meets an obstruction while traveling under control. Neither is a restraint, and neither will arrest a door that's descending under its own weight. ### Why does one side of my door drop faster? One side has lost its support — a cable off its drum, a snapped cable, or a drum that has slipped on the shaft. It's not caused by a broken torsion spring, since both springs share a single shaft and a break makes the door uniformly fast rather than lopsided. A one-sided drop is heading directly for an off-track door. ### My door catches partway then drops. What is that? Something is binding — a seized roller, a bent track, a loose hinge, debris in the track — and holding weight the springs no longer are. Then the door overcomes it all at once and drops from that height. It's almost always two faults at once, and it's more dangerous than a steady fast close because it doesn't happen at the same point twice. ### Can a fast-closing door damage itself? Yes, and the bottom section takes the worst of it. Each hard landing puts the impact through the lowest panel and into the bottom brackets and rollers. A door that has been slamming for months often needs panel or bracket work on top of the springs, which is a good argument for acting on the first fast close rather than the twentieth. ### Is it safe to use the door until someone can come out? We'd say leave it closed. A closed door resting on the concrete is stable, and nothing about the fault gets worse from sitting still. What makes it worse is cycling it, since each descent is another uncontrolled one and each hard landing adds damage. Unplug the opener so nobody uses it out of habit. ### Why does it only happen sometimes? Intermittent means a fault that hasn't finished developing rather than one that's resolving. A spring on the edge of failure, a cable that's slipping occasionally, or something binding that catches at slightly different points all produce a door that behaves most of the time. The occasional version is the warning, not the reprieve. Intermittent is still a reason to book the [garage door spring repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-spring-repair/) while the door is behaving. ### Where this information comes from - UL 325 — safety standard for residential garage door operators — what contact reversal is actually designed to do, and why it isn't a restraint for a falling door - [DASMA Technical Data Sheet #190 — Factors Affecting Spring Cycle Life](https://www.dasma.com/wp-content/uploads/2021/12/TDS190.pdf) — source of the insufficient-torque passage quoted here — DASMA names too few winding turns as a cause of a door drifting down from its open position — and of the doors-left-open climate guidance. It carries no cycle-count rating - [DASMA Technical Data Sheets (full index)](https://www.dasma.com/technical-data-sheets/) — wider reference covering counterbalance systems and extension spring containment Serving the Valley ## Where we come out We’re a family-run shop based in **Mesa**, and we cover the whole Phoenix metro. Same-day service is our standard — pick your city, or just call [(602) 935-9766](tel:+16029359766) and we’ll find the soonest slot that works. 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Give us a call — if we can’t get to you, we’ll point you to someone who can. Mesa-based · Serving the whole Phoenix Valley ## Want us to just take care of it? If you’ve worked through this and you’d rather have someone who does this every day handle it — that’s us. Tell us what your garage door is doing and we’ll come diagnose it properly. [☎ (602) 935-9766 Call or text — we pick up](tel:+16029359766) [Book online Pick your own time slot](https://farnsworthgarage.com/book-appointment-now/) - **Same-day service** is our standard - **Family-owned** right here in Mesa - **Straight answers** — we’ll tell you if it’s not worth fixing - **Written quote** before any work starts Due for a check-up anyway? Our full tune-up is **$39.99** — same price in every city we serve, and we’ll go through the whole system while we’re there. Mesa · Gilbert · Chandler · Queen Creek · Scottsdale · Tempe · Phoenix · San Tan Valley · Apache Junction · Gold Canyon · Fountain Hills · Maricopa · Guadalupe --- Source: https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-closes-too-fast/ · HTML version with images, galleries and booking form. Farnsworth Garage Door Service, Mesa, AZ · (602) 935-9766