When your garage door refuses to close, the most common causes are misaligned safety sensors, broken springs, track obstructions, remote or wall button malfunctions, limit switch misadjustment, weather seal sticking, or a power supply issue. I’m Patrick Alvaro, owner of Alvaro’s Garage Doors in Monroe, CT, and these seven problems account for over 95 percent of the service calls I take for doors that won’t close across Fairfield County. Here’s how to diagnose each one.
1. Are Your Safety Sensors Misaligned?
Safety sensor misalignment is the number-one reason garage doors refuse to close, and it’s also the easiest to fix yourself. Every garage door manufactured after 1993 has two photo-eye sensors mounted near the floor on each side of the door opening, about six inches off the ground. These sensors project an invisible infrared beam across the opening. If the beam is broken or the sensors are knocked out of alignment, the door will reverse immediately after starting to close, or it won’t move at all. First, check that nothing is blocking the beam path, including cobwebs, dirt on the lens, or objects near the floor. Clean both sensor lenses with a soft cloth. If the indicator light on one sensor is blinking instead of steady, that sensor is out of alignment. Gently adjust its bracket until the light goes solid. Homeowners in Monroe and Trumbull call me for this issue frequently, especially after bumping a sensor with a trash can or bicycle.
How do I know if my garage door sensors are bad?
Check the LED indicator lights on each sensor. A steady green light means the sensor is receiving the beam correctly. A blinking or no light means there’s a problem. One sensor sends the beam (usually has an amber LED) and the other receives it (usually has a green LED). If cleaning and realigning doesn’t restore a solid light, the sensor itself may be faulty and need replacement. Sensor replacement typically costs $85 to $150 and takes about 30 minutes.
2. Could a Broken Spring Be Preventing Your Door from Closing?
A broken garage door spring can prevent your door from closing properly, though more commonly it prevents the door from opening. If one spring has broken while the door was open, the door may close unevenly, get stuck partway, or slam shut dangerously fast because it no longer has the counterbalance the spring provides. You can check for a broken spring by looking at the torsion spring mounted above the door. If you see a visible gap in the coil, the spring is broken. Do not attempt to manually close a door with a broken spring. Call a professional immediately. Homeowners in Shelton and Stratford can reach us at (203) 895-3017 for same-day spring replacement.
3. Is Something Wrong with Your Garage Door Tracks?
Track issues are a common but often overlooked cause of a garage door that won’t close. Over time, tracks can become misaligned, bent, or obstructed with debris. Look along both vertical and horizontal tracks for visible bends, dents, or gaps between the track and the rollers. You can safely clean your tracks with a damp cloth and remove any visible debris. However, if you notice bent or misaligned tracks, do not try to bend them back into place yourself. Professional track realignment costs $125 to $250.
4. Is Your Remote or Wall Button Malfunctioning?
Sometimes the door itself is fine and the problem is with the device you’re using to control it. If your remote control doesn’t work but the wall-mounted button does, start by replacing the remote’s battery, which is a CR2032 in most models. If neither the remote nor the wall button works, check your opener’s power source. If only the wall button fails, the issue is likely a broken wire running from the button to the opener unit.
5. Does Your Garage Door Opener’s Limit Switch Need Adjustment?
The limit switch tells your garage door opener how far the door should travel before it’s fully open or fully closed. If the close-limit switch is set incorrectly, the opener may think the door has reached the floor before it actually has, causing it to stop short or reverse. On most openers, the limit adjustment is controlled by a small screw or dial on the side or back of the motor unit. Make tiny adjustments, test the door, and repeat until the door closes fully against the floor.
6. Is Your Weather Seal Sticking or Frozen?
Connecticut homeowners deal with this issue every winter. The rubber weather seal at the bottom of your garage door can freeze to the garage floor or driveway surface during cold snaps. To prevent freezing, apply a thin layer of silicone-based lubricant or cooking spray to the bottom seal before temperatures drop below freezing. A damaged, cracked, or hardened weather seal should be replaced entirely, which costs $30 to $80.
7. Is There a Power Issue with Your Garage Door Opener?
Before diving into complex troubleshooting, check the basics. Is your garage door opener plugged in? Check that the outlet has power by plugging in another device. Next, check your home’s circuit breaker or fuse panel. If you’ve had a recent power outage, your opener may need to be manually reset by unplugging it for 30 seconds and plugging it back in.
When Should You Call a Professional for a Garage Door That Won’t Close?
Some of the causes above are safe for homeowners to diagnose and fix: cleaning sensors, replacing remote batteries, clearing track debris, and adjusting limit switches. However, you should call a professional for any issue involving springs, cables, track realignment, or internal opener repairs. If you’ve tried the basic troubleshooting steps above and your door still won’t close, call Alvaro’s Garage Doors at (203) 895-3017. I provide same-day service throughout Fairfield County and always give you a straight answer and an honest quote before starting work. Fast. Fair. Family.
