When Your Garage Door Refuses to Close
Few things are more frustrating than a garage door that opens fine but will not close. You press the button, the opener activates, and the door either reverses immediately, stops partway down, or does not move at all. This is one of the most common calls we get from Pacifica homeowners, and the good news is that several of these causes have straightforward fixes.
Here are the seven most common reasons your garage door will not close, what to look for with each one, and whether you can handle it yourself or need a professional.
1. Safety Sensor Misalignment
What It Looks Like
The opener motor runs for a second, the door starts to move down, then immediately reverses back up. Or the opener light blinks but the door does not move at all. Most modern openers have an LED on each sensor: one steady and one blinking usually indicates misalignment.
The Fix
Safety sensors (also called photo-eyes) are mounted about six inches off the ground on either side of the garage door opening. They project an invisible beam across the opening, and if that beam is broken or misaligned, the door will not close as a safety precaution.
Check that both sensors are pointed directly at each other and that nothing is blocking the beam path. Cobwebs, dirt on the lens, a broom leaning against the wall, or even direct sunlight hitting a sensor can cause false triggers. Clean the lenses with a soft cloth and gently adjust the brackets until both indicator lights show steady.
This is a DIY fix in most cases. If the sensors are properly aligned and clean but the problem persists, the wiring between the sensors and the opener may be corroded, which is common in coastal garages. That requires a professional to diagnose. Visit our garage door repair page if you need help.
2. Broken Torsion or Extension Springs
What It Looks Like
The door feels extremely heavy when you try to lift it manually. The opener strains and either stalls or reverses. You may have heard a loud bang from the garage earlier, which is the sound of a spring snapping under tension.
The Fix
A broken spring is not a DIY repair under any circumstances. Garage door springs are under extreme tension and can cause serious injury or death if handled incorrectly. If you suspect a broken spring, do not attempt to operate the door.
Call a professional for spring replacement. We can typically replace springs the same day in Pacifica and have your door operating again within an hour.
3. Track Obstruction or Damage
What It Looks Like
The door starts to close but gets stuck at a specific point, makes grinding or scraping noises, or moves unevenly with one side lower than the other. You may see visible dents, bends, or debris in the metal tracks.
The Fix
Inspect the tracks on both sides of the door from top to bottom. Look for small objects like rocks, leaves, or tools that may have fallen into the track channel. In Pacifica, we also see salt buildup and rust spots that create friction points.
You can carefully remove loose debris yourself. For dented or bent tracks, do not try to hammer them back into shape, as this often makes alignment worse. A professional can straighten tracks properly or replace damaged sections.
4. Opener Limit Switch Issues
What It Looks Like
The door closes most of the way down, then reverses before reaching the floor. Or it closes completely but the opener continues running as if the door has not reached the bottom.
The Fix
Your garage door opener has adjustable limit switches that tell it where the fully open and fully closed positions are. If the close limit is set incorrectly, the opener thinks the door has hit an obstruction when it is actually just reaching the floor.
On most openers, there are two adjustment screws, usually labeled "up" and "down" or "open" and "close." Small clockwise turns on the close limit increase the travel distance. Make quarter-turn adjustments and test after each one.
This is a manageable DIY fix if you are comfortable on a ladder and can identify the adjustment screws on your specific opener model. Check your opener manual for the exact location. If you are unsure, our opener repair team can adjust this in minutes.
5. Remote Control or Wall Button Problems
What It Looks Like
The door does not respond to the remote at all, but works fine from the wall-mounted button, or vice versa. Or neither control works, but the door operates manually without issue.
The Fix
Start with the simple fix: replace the batteries in your remote control. This solves the problem about 40 percent of the time, and it is the fix people most often overlook.
If fresh batteries do not help, try reprogramming the remote to the opener following the manufacturer instructions. The wall button connects directly to the opener with low-voltage wiring, so if the wall button does not work, check the wire connections at both the button and the opener unit. Corroded wire terminals are a common issue in damp coastal garages.
If neither the remote nor the wall button works, the problem is likely in the opener itself: a failed circuit board, blown capacitor, or damaged receiver. That needs professional diagnosis.
6. Weatherstripping or Bottom Seal Resistance
What It Looks Like
The door closes most of the way down, then reverses in the last few inches. This often happens seasonally or after a temperature change.
The Fix
The bottom seal (rubber gasket along the bottom edge of the door) can swell, warp, or shift position over time. When it gets thick or stiff, it creates enough resistance against the garage floor that the opener force sensor interprets it as an obstruction and reverses the door.
Inspect the bottom seal for swelling, tears, or misalignment. In Pacifica, UV exposure and temperature swings cause these seals to degrade faster than the manufacturer expects. Replacing a worn bottom seal is an inexpensive fix, typically under $50 for the part.
You may also need to adjust the opener force setting slightly. Most openers have a "close force" adjustment near the limit switch controls. A small increase can compensate for minor resistance without compromising safety.
7. Broken or Frayed Cables
What It Looks Like
The door hangs crooked when partially open, or one side drops lower than the other. You may see a loose cable hanging along one side of the door, or the cable has jumped off the drum at the top.
The Fix
Like springs, cables are under significant tension and should only be repaired by a professional. A frayed or broken cable can cause the door to drop suddenly, creating a serious safety hazard.
Do not try to rewind a cable onto the drum yourself. The drum, cable, and spring system work together under precise tension, and improper adjustment can lead to further damage or injury.
Contact us for a same-day cable repair appointment. Cable replacement is one of the faster repairs we perform, usually completed in under an hour.
When to Call a Professional
As a general rule, any repair involving springs, cables, or the torsion system should be handled by a trained technician. Sensor adjustments, limit switch tweaks, remote reprogramming, and seal replacements are reasonable DIY tasks for a handy homeowner.
If you have tried the basic troubleshooting steps and your door still will not close, or if you are not comfortable working around the opener and spring system, give us a call. We diagnose garage door problems in Pacifica every day and can usually identify the issue within a few minutes of arrival.