Garage Door Won’t Stay Closed
A garage door that won’t stay closed almost always points to one of three things: the safety sensors are misaligned or blocked, the limit settings on the opener are off, or a mechanical issue with the springs or tracks is preventing the door from seating properly. In most cases, a trained technician can find the cause and fix it in a single visit. If your door is reversing before it hits the floor, stopping partway down, or bouncing back up as soon as it closes, read through the causes below – one of them is almost certainly what you’re dealing with.
The door itself isn’t being stubborn. Something has gone out of adjustment, worn down, or failed, and the door is doing exactly what it’s designed to do when it senses a problem. The frustrating part is that “senses a problem” can mean anything from a leaf sitting in front of a sensor to a broken spring that’s putting the whole system under the wrong load. Working through the most likely causes in order is the fastest way to understand what’s actually happening.
Why It Happens
Misaligned or Obstructed Safety Sensors
Every modern garage door opener has two small sensors mounted near the floor on either side of the door opening – one sends an invisible beam, the other receives it. If anything breaks that beam, or if the sensors have been bumped out of alignment, the opener interprets it as an obstruction and refuses to close. You can usually spot this immediately: the opener light will blink several times (the count varies by brand – LiftMaster and Chamberlain units typically flash ten times), and the sensor LED on one side will be dim, off, or flickering orange instead of a steady green.
Incorrect Limit or Force Settings on the Opener
The opener has internal settings that tell it how far the door should travel and how much resistance is normal. When those limits drift out of calibration – which happens gradually over time, or after a power surge – the opener can think the door has hit the floor before it actually has, and reverses. The tell-tale sign here is a door that comes down most of the way and then reverses without touching anything, with no sensor light blinking. The opener itself is fine; it just needs to be recalibrated.
Worn or Broken Springs
The springs are what Mainspring Garage Door Co. takes its name from – they carry the full weight of the door so the opener doesn’t have to. When a torsion or extension spring wears out or breaks, the door can become too heavy for the opener to control properly, causing it to reverse, stall, or refuse to seat. You might hear a loud bang when a spring breaks, and afterward the door will feel extremely heavy if you try to lift it by hand. Springs are under high tension and should never be adjusted or replaced without proper training and tools – if you suspect a spring is the issue, stop using the door and call.
Bent Track or Debris in the Track
The door rides on a pair of metal tracks, and if either one is bent, misaligned, or clogged with dirt and debris, the door can bind before it fully closes. Look along both tracks while the door is partway down – you’re looking for visible gaps between the rollers and the track, a section of track that’s visibly bowed inward, or grit packed into the track channel. A door that grinds or shudders on the way down, then stops short, is often telling you something is physically in the way.
What to Do Right Now
- Check the sensors first. Look at both sensor units mounted a few inches off the floor on each side of the door. Both indicator lights should be solid and steady. If one is blinking or dark, gently wipe the lens with a dry cloth and look for anything blocking the beam – a broom handle, a bag, even a cobweb. Don’t force anything.
- Stop using the door if it reverses with a bang or feels unusually heavy. That’s a broken spring until proven otherwise. A door with a failed spring can drop without warning. Leave it in the closed or open position, don’t run it again, and call your local Mainspring Garage Door Co. team. This is not a wait-and-see situation.
- Look at the tracks. With the door closed, scan both tracks for obvious dents, separations from the wall bracket, or packed-in debris. Take a photo if you see something. Don’t try to bend a track back by hand – you’ll likely make it worse and you risk the door coming off the track.
- Check whether the issue is consistent or intermittent. Does the door fail every single time, or only in cold weather, or only at a certain time of day? Intermittent failures point toward sensor issues (especially if direct sunlight hits the sensor at certain hours). Consistent failures point toward mechanical or calibration problems. This detail will save the technician time.
- Take a short video if you can. A ten-second clip of the door reversing tells a technician more than a description. You’ll have it ready when you call.
How We Fix It
When your local Mainspring Garage Door Co. technician arrives, the first thing they do is run the door through a full diagnostic cycle – watching the sensors, listening to the opener, testing the spring balance by hand, and checking the track alignment. Our trucks are stocked with springs, cables, sensors, and opener components, so in most cases the repair is finished in a single visit with no waiting on parts.
If the sensors are the issue, they’re realigned and secured. If the opener limits need adjustment, that’s done on-site. A broken spring is replaced as a matched pair – replacing only the failed one leaves the other ready to go soon after, and we don’t set our customers up for a second call in six months.
Before anything is touched, you get a flat price in writing. That’s what you pay – no line items that appear after the fact. The work is covered by our 90-Day Done Right Promise: if it’s not right, we come back. No paperwork, no arguing – it’s in writing on every job. This falls under our Garage Door Repair service, and if the opener itself needs work, that’s handled under Garage Door Opener service. Most visits run one to two hours from arrival to a properly working door.
Frequently Asked Questions
It can be, yes – and the risk level depends on the cause. A misaligned sensor is an annoyance. A broken spring is a genuine safety hazard: the door is no longer counterbalanced properly and can fall with force. If your door feels heavy, made a loud noise before the problem started, or drops unevenly, stop using it until a technician has looked at it. Call (844) 755-5838 and let us know what you’re seeing – we’ll tell you straight whether it needs same-day attention.
If the door closes at all – even imperfectly – and you’ve confirmed the sensors and tracks look normal, a day or two is usually fine. If the door won’t close at all, or you suspect a spring failure, don’t wait: a door stuck open is a security and weather problem, and a door with a bad spring is a safety problem. Our phones are answered by a live person around the clock, including nights and weekends – call (844) 755-5838 and we’ll get someone out.
In most cases, yes. Calls to (844) 755-5838 are answered by a live person 24 hours a day, seven days a week – not a voicemail, not a phone tree. Your local Mainspring Garage Door Co. team will give you a straight answer on availability and get you on the schedule. Because our technicians arrive with parts on the truck, we don’t need a second trip to source what the job requires.
Sensor problems almost always announce themselves with a blinking opener light and a steady-red or flickering indicator on one of the sensor units near the floor. If the lights look fine on both sensors and the door is still reversing, or if the door feels heavy or made a loud sound, you’re likely looking at a spring, cable, or limit issue rather than a sensor. A quick call to (844) 755-5838 – describing what you see and hear – will usually help narrow it down before a technician even arrives.
Get It Fixed
Call (844) 755-5838 – a live person answers any hour of the day – or book online. Your local Mainspring Garage Door Co. team will diagnose the problem, give you a flat price in writing before any work starts, and get your door working right.
Written by Carl Dutton, Owner at Mainspring Garage Door Co., serving local communities since 1984.