Crush Prevention Systems: Protecting Your Family
2026-04-07 7 min read
If your garage door came with your home and you've never thought twice about how it stops when something's in the way. this post is for you. Garage doors are among the heaviest moving objects in a home, and out here in Harrells and the surrounding communities of Burgaw and Rose Hill, a lot of the housing stock includes older ranch-style homes and farmhouses where the original door hardware may be decades old. That means the safety systems protecting your family may be outdated or failing without you even knowing it.
What Is a Crush Prevention System?
A crush prevention system is the collection of safety features built into a modern garage door that stop or reverse the door's movement when it detects an obstacle. a child, a pet, a bicycle, a package. It's not one single component; it's a combination of technologies working together.
Here's what a properly equipped door should have:
Photo-Eye Sensors
These are the two small sensors you'll find mounted near the floor on either side of your garage door opening. They send an invisible infrared beam across the doorway. If anything breaks that beam while the door is closing, the door automatically reverses. Federal law has required photo-eye sensors on all new residential garage door openers since 1993. but if your opener is older than that, or if the sensors have been knocked out of alignment, you may not have reliable protection.
In Harrells, sensors get bumped more often than people realize. Lawn equipment, bikes, and general garage traffic regularly knock them out of position. And in our humid climate, the lenses can fog or corrode over time, reducing their effectiveness. A quick check: if the sensors' indicator lights are blinking rather than solid, they're misaligned or obstructed.
Auto-Reverse (Force Sensing)
Separate from the photo-eye beam, your opener also uses force sensing. it monitors how much resistance the door encounters while closing. If the door hits an object with enough force, it's supposed to stop and reverse. You can test this yourself: place a flat 2x4 board flat on the garage floor under the door and close it. The door should reverse the moment it contacts the wood. If it doesn't, your opener's force sensitivity needs adjustment.
This is the safety test most homeowners never perform. and one of the most important ones. Don't skip it.
Edge and Pressure Sensors
Higher-end modern doors include additional pressure-sensitive edges along the bottom of the door. These give an added layer of protection independent of the photo-eye sensors. They're especially valuable in situations where the beam might be obstructed or dirty. If you're upgrading your door and have young children or pets, it's worth asking about these.
Why Harrells Homeowners Should Pay Attention
The humidity in Sampson County is no joke. Moisture accelerates corrosion on sensor hardware, warps wooden garage trim that can block sensor alignment, and degrades the rubber bottom seal in ways that affect how the door contacts the floor. All of these factors can compromise crush prevention systems that would otherwise work fine in drier climates.
Additionally, many homes in this area. especially the midcentury ranch-style and older farmhouse properties. still have older openers installed long before modern safety standards were in place. If your opener predates the mid-1990s, it almost certainly lacks adequate auto-reverse capability by today's standards.
You can learn more about how the full opener system works. and what else to watch for. in our complete opener troubleshooting guide.
How to Test Your System Right Now
Here's a simple 3-step check you can do in about five minutes:
1. Test the photo-eye sensors. Close the door and wave your leg through the beam while it's moving. The door should immediately reverse. If it doesn't, your sensors need attention. 2. Test the force reversing. Use the 2x4 test described above. If the door doesn't reverse on contact, adjust the sensitivity setting on your opener (it's usually a dial or screw on the motor unit. check your owner's manual). 3. Inspect the sensors physically. Make sure both units are pointing directly at each other, the lenses are clean, and no wiring is frayed or corroded.
If anything fails these tests, don't ignore it. A door that won't reverse is a crush hazard. period.
When to Call a Professional
Some of this is DIY-friendly. Cleaning lenses, realigning sensors. a homeowner can handle that. But if your force sensing is way off, if the opener itself is aging out, or if you're not sure what generation of safety technology you have, it's worth getting a professional set of eyes on it. Garage Door Harrells can inspect your entire door system and let you know honestly whether what you have is still up to standard or needs updating.
You can also review our full services page to see what a complete safety inspection covers.
Don't Assume New Means Safe
One more thing worth saying: even newer openers can have sensors that drift out of alignment or get bumped and never get corrected. "New" doesn't mean "properly configured." The only way to know your crush prevention system is actually working is to test it. The tests above take five minutes. That's time well spent when the alternative is finding out the hard way.
If you have kids or pets using the garage regularly, make a habit of running these checks every few months. especially after storm season, when doors take a beating and things shift around. For more on protecting your home during storm season, our post on storm and wind prep for Harrells homeowners covers what our local weather can do to the full door system.
Frequently Asked Questions
Q: My garage door reverses randomly even when nothing is in the way. What's going on?
A: Random reversal usually means your photo-eye sensors are misaligned, dirty, or picking up interference from sunlight or a reflective surface. Check that both sensors face each other directly, clean the lenses with a dry cloth, and make sure nothing is casting a shadow or glare across the beam path. If the problem persists, the sensors may need replacement.
Q: How often should I test my garage door's safety reversal system?
A: A good rule of thumb is to test both the photo-eye beam and the force-reversing function at least twice a year. spring and fall work well. In Harrells, after any major storm is also a smart time to recheck, since high winds and debris can knock sensors out of alignment.
Q: My opener is from the late 1990s. Is it safe?
A: It depends. Openers manufactured after January 1993 were required to include auto-reverse, but the quality and sensitivity of those early systems varied significantly. If your opener is more than 20,25 years old, it's worth having it professionally evaluated. Safety technology has improved substantially, and contacting us for an inspection is the most reliable way to know where you stand.