How To Adjust Garage Door Sensors: A Step-By-Step Guide

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As a garage owner, you know that safety is of utmost importance. This is why it’s essential to learn how to adjust your garage door sensors when they are not working correctly. As a result, you can ensure that your garage doors are always in safe working condition.

Fortunately, adjusting your garage door sensor is a relatively straightforward process that can be done in just a few minutes in most cases. In this article, I’ll show you how to adjust your garage door sensors and hopefully help you save some money by doing this job yourself.

What Are Garage Door Sensors, And What Do They Do?

A garage door sensor is a device that helps open and close garage doors automatically. Often located at the top of the door, these sensors work by detecting the presence of an object in the path of the garage door and sending a signal to the opener to either open or close the door.

Some garage door sensors also have an LED light that indicates whether the door is open or closed. If the LED light is solid green, the door is open. If the light is red, it means the door is closed.

Garage door sensors are a great convenience because they save you from leaving your car to manually open or close the garage door.

They also improve security by ensuring that the door is properly closed when not in use.

How To Adjust Garage Door Sensors: Step-By-Step

If your garage door isn’t opening or closing correctly, it could be because the sensors are out of alignment. To fix this, you’ll need to calibrate the sensors.

Follow these eight steps to align your garage door sensors properly:

1. Turn off power to the garage by tripping the fuse to your garage in the breaker box. While you are unlikely to be in direct contact with any live wires, it’s always best to err on the side of safety when dealing with electricity.

2. Locate the two sensors on either side of the door. These are typically located on the sides of the door near the bottom. Once you have found them, you will need to clean off any dirt or debris that may be blocking their view.

3Loosen each sensor bracket. You need to be able to slide the sensors up and down without the sensor coming out when you do so. They also need to stay put once you reposition them.

4. Slide both mounting brackets down without the sensors coming out of their position.

5. Tie each end of a string to both mounting brackets. Be sure to make the line tight between the two brackets.

6. Ensure the string is level between the two brackets. To accomplish this, hold the level under the string. Adjust the mounting brackets up or down until the string is level.

7. Tighten the sensor bracket screws. The sensors should be lined up to point directly at each other, and the LED lights should both be green. Adjust the sensitivity of the sensors using the adjustment screws on each unit. Turn them clockwise to make the sensors more sensitive and counterclockwise to make them less sensitive. Slide each garage door sensor downward until the LED lights on both sensors are green.

8. Turn the power back on to the garage and open and close the door. Your garage door should now work correctly.

If the door does not operate correctly, you may need to adjust the sensitivity again. With a bit of trial and error, you should be able to get the garage door sensors properly calibrated and your door back in working order reasonably quickly.

If your garage door isn’t working correctly after completing these steps a second time, you may need to replace one or more sensors.

Luckily, garage door sensors are not exorbitantly expensive. You can purchase replacement sensors at most hardware stores, which usually run about $75 to $100 for most garage doors.

How Do I Reset My Garage Door Sensors?

If your garage door sensors malfunction, it can be frustrating trying to figure out how to reset them. However, you can follow a few easy steps to get your sensors working again.

Reset your garage door sensors by following these steps:

1. Locate the two sensor eyes at the bottom of the garage door track on either side of the door.

2. Use a ladder or step stool to reach the sensors.

3. Wipe any dirt or debris off the sensors with a clean cloth.

4. Press and hold the reset button on one of the sensors for about 30 seconds.

5. Release the reset button and press it again for about 30 seconds.

6. Repeat Step 5 for the other sensor.

7. Test the sensors by opening and closing the garage door a few times to see if they are working correctly.

It can be frustrating trying to figure out how to reset your garage door sensors. But in most cases, these simple tips will do the trick. So don’t give up hope – resetting your garage door sensors is usually a pretty easy fix.

How To Test If a Garage Door Sensor Is Out of Alignment

If your garage door isn’t opening or closing correctly, the sensors may be out of alignment.

It’s easy to test whether your garage door sensor is out of alignment:

To test whether your garage door sensors are working correctly, place an object in line with the sensors and close the garage door. If the door reverses after detecting the object, your garage door functions precisely as the manufacturer intended. 

If the sensor beams are not interrupted when the door is closed, they are likely out of alignment. You can also try manually opening and closing the door while watching the sensors; if they do not activate when they should, then they are probably out of alignment.

If your garage door sensors are out of alignment, it’s essential to get them fixed as soon as possible.

If left unaddressed, an out-of-alignment sensor can cause severe damage to your garage door opener and your garage door itself.

In some cases, an out-of-alignment sensor can even prevent your garage door from opening or closing. Call a professional garage door repair technician for assistance if you suspect that your garage door sensors are out of alignment.

How Do You Test Garage Door Sensors With a Multimeter?

Electrical construction blueprint, drawings or diagrams, multimeter for measurement in electrical installation, and accessories for use in engineer jobs

To test garage door sensors with a multimeter, you’ll need to:

1. Locate the two sensor terminals. These are typically marked “+” and “-” or “s” and “g.”

2. Set your multimeter to the desired resistance range.

3. Touch one probe to each sensor terminal.

4. The sensors function correctly if the readings are within normal limits. If not, they may need to be replaced.

Garage door sensors are an essential safety feature on your garage door opener. By testing them regularly, you can ensure they’re working correctly and help prevent accidents.

How To Troubleshoot Common Garage Door Sensor Problems

If your garage door opener is having trouble with the sensors, you can do a few things to troubleshoot the problem.

Here are some common garage door sensor problems and how to fix them:

1. Misaligned sensors – One of the most common problems garage owners encounter is misaligned garage door sensors. This issue can be quickly resolved by adjusting the sensors to point at each other.

2. The batteries are dead.- The first thing you should check is the batteries. If they are low, replace them and see if that fixes the problem.

3. Dirty Sensors – Next, check if the sensors are clean. If they are dirty, wipe them down with a soft, damp cloth.

4. Object(s) obscuring the sensor’s beam – If the garage door still doesn’t open, it could be because something is blocking the sensor’s view. Check to see if anything is blocking the path between the sensors, and remove it if there is.

5. Loose wire connections – Inspect the wires leading to the sensor for any signs of damage. If you see any frayed or broken cables, gently twist them back together and tape them with electrical tape. Once you have repaired any damaged wires, test the sensor again to see if it is now working correctly.

6. The garage door opener’s receiver may be too far from the sensor. A garage door receiver needs to be within range for the sensor to work correctly. If you have recently moved the opener or installed a new one, make sure that the receiver is still within range of the sensor. You can test this by holding down the “open” button on your remote control while standing next to the opener. If the door opens, then the receiver is still within range.

7. Defective sensors – Finally, if none of these solutions work, it’s possible that the sensors themselves are defective. In this case, you’ll need to replace them. Fortunately, garage door sensors are relatively inexpensive and easy to find.

In most cases, you should be able to fix any problem you encounter with your garage door sensors. However, If you have tried these troubleshooting tips and your garage door sensors are still not working, It’s best to contact a professional for further assistance.

Troubleshooting can be a pain, but keeping your garage door opener working correctly is worth it.


Garage door sensors are an essential part of your garage door opener system. They help to ensure that your garage door opens and closes properly. If your sensors are not aligned correctly, it can cause the garage door to open or close unevenly, potentially causing damage to the door or the opener.

By following these simple steps, you can ensure that your garage door sensor is aligned and functioning correctly for years to come.

Hi, I am Brent Hartman. I am a DIY enthusiast and love to improve and organize the garage in the most innovative way. I created this website out of my passion for helping people organize their garages.

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