How to Troubleshoot Garage Door Sensors That Won’t Work

At Whizz Garage Doors, we understand the frustration that comes with malfunctioning garage door sensors. A properly functioning sensor is crucial for the safety and security of your home. If you’re experiencing issues with your garage door sensors, we’re here to help you troubleshoot the problem and get your sensors back in working order. In this comprehensive guide, we’ll walk you through the troubleshooting process step-by-step, providing detailed instructions and insights along the way.

Introduction to Garage Door Sensors

Garage door sensors are a critical component of an automated garage door system. They are designed to detect obstacles or objects in the path of the door, ensuring that it stops or reverses its movement to prevent accidents or damage. These sensors typically consist of two units: the sending unit and the receiving unit.

Step 1: Visual Inspection

The first step in troubleshooting your garage door sensors is to conduct a thorough visual inspection. Carefully examine both the sending and receiving units to ensure they are properly aligned and free from any obstructions. Over time, sensors can become misaligned due to accidental bumps or vibrations.

If you notice any physical obstructions such as dirt, debris, or spiderwebs obstructing the sensors’ lenses, gently clean them using a soft, lint-free cloth. It’s essential to maintain clean and clear lenses for optimal sensor functionality.

Step 2: Check for Power Supply

Garage door sensors require a stable power supply to function correctly. Check if the sensors are receiving power by inspecting the wiring and connections. Look for any loose or damaged wires that may be disrupting the power flow.

If you find any loose wires, carefully reconnect them to their respective terminals. In case of damaged wires, it is advisable to consult a professional technician to replace or repair them.

Step 3: Test the Sensor Alignment

Proper alignment of the garage door sensors is crucial for their optimal performance. To test the alignment, follow these steps:

  1. Locate the sending and receiving units on either side of your garage door.
  2. Measure the distance between the ground and the sensors. It should be the same on both sides.
  3. Use a level to ensure that each sensor is perfectly vertical.
  4. Adjust the sensor’s position if necessary until it is aligned correctly.

Step 4: Clean the Sensor Lenses

Over time, the lenses of garage door sensors can accumulate dirt, dust, or other particles, affecting their ability to function properly. Clean the lenses by following these instructions:

  1. Disconnect the power supply to the garage door opener.
  2. Gently remove the sensors from their brackets.
  3. Use a clean, lint-free cloth to wipe the lenses carefully.
  4. Avoid using harsh chemicals or abrasive materials, as they can damage the lenses.
  5. Once the lenses are clean, reattach the sensors to their brackets securely.

Step 5: Test the Sensor Operation

After completing the previous steps, it’s time to test the functionality of your garage door sensors. Follow these guidelines to ensure they are working correctly:

  1. Restore power to the garage door opener.
  2. Press the garage door opener button to close the door.
  3. Wave an object, such as a broomstick, in the path of the closing door, approximately 6 inches above the ground.
  4. The door should stop and reverse its movement as soon as the object breaks the infrared beam between the sensors.
  5. If the door doesn’t reverse or exhibits any other abnormal behavior, repeat the troubleshooting steps or consult a professional technician for further assistance.


By following the steps outlined in this guide, you can troubleshoot and resolve issues with your garage door sensors effectively. Remember to conduct regular maintenance and inspections to ensure the long-term

Share the Post:

Related Posts