How to Align Your Garage Door Sensors in Under 30 Minutes

Before you start fiddling with your garage door opener and its sensors, turn off the power. If they’re plugged into a wall outlet, just unplug them. If not, head to your breaker box and trip the fuse to the whole garage. Don’t worry—you’re not getting up close and personal with any live wires here, but it’s always wise to wear electricity-resistant gloves, just in case. A little precaution goes a long way, and it’s always better to play it safe with electricity.

Next, grab your screwdriver and loosen the screws on the mounting bracket for each sensor. Don’t go too far—you’re not removing them entirely. Loosen them enough so the sensors can move up and down. The goal is to give them enough room to shift when you want to move them without them being so loose that they move on their own.

Slide your garage door sensors down. Move them as low as possible without the screws popping out. You want them to be at their lowest point while still securely in the brackets. And you should opt for a "hands only" rule here. You may be tempted to use another tool to tap and shift it into place, but experts would suggest otherwise. Tools can scratch or damage the sensors, and you don’t want that. At this point, all you need is an alignment, not a replacement. Just give the sensors a gentle nudge into place.

Grab and cut a string that’s a few inches longer than your garage door opening. Tie one end to the first sensor and bracket. Make sure it’s tight. Then, stretch the string across to the second sensor so it runs right through the center. Tie it off so the string sits exactly across the middle of that sensor. This will be your guide to make sure both sensors are aligned.

Hold a level along the string to check if it’s straight. Read the level by making sure the bubble is centered between the lines. If it’s off, slide the sensor brackets up a bit to adjust them. This might take a couple of tries to get it right. And if you get tired of the back-and-forth, now’s a good time to bring in help so they can handle the leveling on one side as you handle the other. While you can definitely handle this project on your own, a helping hand can make the process go a lot smoother and faster.

Now that your sensors are lined up, tighten the screws. Secure them enough so that the sensors stay put when you try to move them. If they don’t budge, move on.

After tightening the screws, double-check that the string and sensors are still level. Tightening the screws can sometimes mess with the alignment, and you don’t want the sensors shifting. If they’re off, realign them. Remember—the infrared beam has to stay perfectly straight to work.

Remove the string and turn the power back on.

Once everything is back on, test your sensors. Grab something safe—like a broomstick—and carefully place the bottom between the sensors. If the door doesn’t close, your sensors are properly aligned. If it does, restart the process or bring in a professional.