How To Align Garage Door Sensors: 2024 Beginner’s Guide

how to align garage door sensors

Garage door sensors are essential components designed to enhance the safety of your garage door system. Comprising a sending unit and a receiving unit, these sensors operate by emitting and detecting an infrared beam of light. This beam spans the width of the garage door opening, creating an invisible barrier.

Their primary function is to detect any obstruction, such as a vehicle, person, or object, that may be in the path of the closing door. When the beam is interrupted, typically by something crossing its path, the sensors immediately communicate with the garage door opener. This prompts the opener to halt the closing process and either hold the door open or reverse its direction, preventing potential accidents or damage.

How Do Garage Door Sensors Work?

Garage door sensors operate on a straightforward yet highly effective principle using infrared technology. The sending unit of the sensor emits a focused beam of infrared light across the width of the garage door opening. This beam is directed towards the receiving unit positioned on the opposite side.

When the garage door is in operation and begins to close, this beam of light serves as an invisible barrier. If anything interrupts or blocks the beam as it travels between the sending and receiving units—such as a person, pet, or object—the sensors immediately detect the obstruction.

Upon detecting the interruption in the beam, the sensors send a signal to the garage door opener. In response to this signal, the opener promptly stops the door from continuing its downward motion. Depending on the garage door opener’s settings and safety features, it may either hold the door open or reverse its direction, ensuring that no harm or damage occurs to anything caught in the door’s path.

Align Garage Door Sensors — A Step-by-Step Guide

how to align garage door sensors

Aligning garage door sensors is a crucial maintenance task to ensure your garage door operates safely and efficiently. Over time, sensors can become misaligned due to vibrations or accidental bumps, which may prevent them from detecting obstacles properly. Fortunately, realigning them is a straightforward process that you can do yourself with the right tools and steps.

Tools Required for Aligning Your Garage Door Sensors:

  • Screwdriver

A screwdriver is indispensable for loosening and tightening the screws that secure the sensor brackets to the mounting surface. This tool allows you to make fine adjustments to the position of the sensors, ensuring they are properly aligned with each other.

  • String

Utilizing a piece of string is a practical method to visually align the garage door sensors. By tying the string between the sensors, you create a straight line that helps you verify if the sensors are parallel and at the correct height relative to each other. This visual guide ensures accuracy during the alignment process.

  • Level

A level is crucial for checking the horizontal alignment of the string between the sensors. It helps you confirm that the string is perfectly level, which in turn ensures that the sensors are aligned correctly. A level ensures that the sensors are not tilted or skewed, which could affect their ability to detect obstacles accurately.

Steps to Align Garage Door Sensors:

how to align garage door sensors
  1. Cut the Power Supply to the Garage

Before beginning any work, prioritize safety by disconnecting the power to the garage door opener. This prevents any accidental movement of the garage door during the alignment process.

  1. Loosen the Screws Holding the Sensors

Using a screwdriver, gently loosen the screws on the sensor brackets. This step allows you to adjust the position of the sensors for alignment without damaging the mounting surface or the sensors themselves.

  1. Slide the Garage Door Sensors Downward

With the screws loosened, adjust the sensor units downward to align them with each other. Ensure they are positioned evenly and parallel to the garage floor to maintain proper functionality.

  1. Attach String and Tie the Knots

Take a piece of string and securely tie it to one sensor unit. Stretch the string across to the other sensor, ensuring it is taut. This visual aid helps in aligning the sensors accurately.

  1. Ensure that the String is Level

Use a level to verify that the string is perfectly horizontal. Adjust the sensor units as needed until the string is level, confirming that the sensors are aligned correctly along their horizontal plane.

  1. Tighten the Screws

Once satisfied with the alignment, tighten the screws on the sensor brackets securely. This secures the sensors in their aligned position and prevents any accidental movement or misalignment.

  1. Turn the Power On

Restore power to the garage door opener. Test the sensors by initiating the garage door closing process. Observe if the door stops or reverses immediately upon detecting the string or any other obstruction placed in its path.

Test if Your Garage Door Sensor is Working

how to align garage door sensors

Testing and identifying issues with your garage door sensors is crucial for ensuring the safety and proper functioning of your garage door system. Here’s how you can test if your garage door sensor is working correctly and signs that indicate your sensors may not be functioning properly:

How Do You Test That Your Garage Door Sensor Is Working?

  • Place an Object in the Path: Place a large object, such as a broomstick or a box, in the path of the closing garage door. Ensure the object interrupts the path of the infrared beam emitted by the sensors.

  • Observe the Door’s Response: Initiate the garage door closing process using the opener. As the door begins to close, the sensors will emit an invisible beam of light across the door opening. If the object placed in the path interrupts this beam, the sensors should detect it.

  • Door Movement: If the garage door sensor is working correctly, it will immediately halt the door’s downward movement and reverse its direction. This action prevents the door from closing on the obstruction, ensuring safety.

Signs That Your Sensors Are Not Working

  • Door Reverses Immediately: When attempting to close the garage door, it starts to close briefly but then immediately reverses without reaching the floor.

  • Door Closes Completely: The new garage door closes fully without interruption, even if there is an object or obstruction in its path. This indicates that the sensors are failing to detect obstacles.

  • Erratic Sensor Lights: Check the indicator lights on the sensor units. If one or both lights are not illuminated at all or are blinking inconsistently, it suggests there may be a problem with the power supply, sensor alignment, or the sensors themselves.

  • Inconsistent Operation: Notice any irregularities in the garage door’s operation, such as intermittent opening or closing issues, which could be attributed to faulty sensors.


How do I realign my garage door sensors?

To realign your garage door sensors, start by disconnecting the power to the garage door opener for safety. Then, use a screwdriver to loosen the screws on the sensor brackets and adjust the sensors until they are parallel to each other and at the correct height. Use a string and level for precise alignment, ensuring the beam of light between the sensors is uninterrupted.

Should both sensors on the garage door be green?

Yes, ideally, both sensors on your garage door should display a solid green light. This indicates that they are receiving power and the infrared beam between them is clear and unobstructed. A solid green light ensures that the sensors are properly aligned and your garage door can operate safely without any interruptions.

Do garage door sensors need to be aligned?

Yes, garage door sensors do need to be aligned for proper functionality. Proper alignment ensures that the sensors can detect obstructions in the door’s path and prevent accidents or damage. Regular alignment checks and adjustments are recommended to maintain the safety and efficiency of your garage door system.

What does it mean when one garage door sensor is green and one is yellow?

When one garage door sensor displays a solid green light and the other sensor shows a yellow light or no light at all, it indicates that there is an issue with sensor alignment or communication. This disparity suggests that the sensors are not aligned properly or there may be an obstruction blocking the infrared beam. Check for obstacles and ensure both sensors are aligned correctly to restore proper operation.

How to fix garage door alignment?

To fix garage door alignment, start by ensuring the power to the garage door opener is turned off. Loosen the screws on the sensor brackets and adjust the sensors until they are parallel to each other and aligned properly. Use a string and level to verify alignment, then tighten the screws securely once aligned. Restore power to the opener and test the garage door to ensure it closes properly without any issues.

How do I reset my garage door position?

To reset your garage door position, first, disconnect the power to the garage door opener. Manually move the garage door to the desired closed position. Once in position, reconnect the power to the opener. The opener will recognize the new position of the door, and you can test its operation to ensure it opens and closes correctly based on the reset position.


Allgood Garage Doors Services Services LLC understands the importance of properly aligned garage door sensors in safeguarding your home and loved ones. By ensuring that your sensors are accurately positioned and calibrated, you enhance the overall safety and efficiency of your garage door system.

Our expert tips for garage door sensor alignment empower you to take proactive steps toward maintaining a secure environment. From cutting-edge techniques to using reliable tools like screwdrivers, strings, and levels, we equip you with the knowledge to ensure your sensors function flawlessly.

Don’t overlook the signs that your sensors may need attention—their seamless operation is pivotal in preventing accidents and protecting your valuable assets. Trust in our professional garage door repair service to address any sensor alignment issues promptly and effectively.

At Allgood Garage Doors Services Services LLC, safety is our priority. Let us help you keep your garage door system operating smoothly and reliably. Contact us today to learn more about our comprehensive garage door services and how we can assist you in maintaining the utmost safety for your home. Your peace of mind is our commitment.

End Note

At Allgood Garage Doors Services Services LLC, we are dedicated to providing top-notch garage door solutions tailored to your needs. Whether you need precise sensor alignment, expert installation, reliable maintenance, or prompt repairs, our team is committed to ensuring your garage door functions safely and efficiently. Visit our About Us page to learn more about our mission and values, and how we prioritize your satisfaction.

Explore our Services page to discover the comprehensive range of garage door services we offer, from routine maintenance to emergency repairs. Our expert technicians are ready to handle any garage door challenge you face, ensuring quality and reliability every step of the way.

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