How Do I Fix My Garage Door Sensor? 

A garage door sensor is a vital safety feature that prevents the door from closing if there’s something in its path. When it’s malfunctioning, not only is your garage’s security compromised, but it can also pose a significant safety risk. 

In this blog post, we are helping you troubleshoot and fix your garage door sensor.

So, without further ado, let’s take a look at what to do here.

Identify the Issue

Begin by observing the sensor’s behavior. If the lights on the sensor are off, flickering, or flashing, it indicates an issue. Also, check if the garage door refuses to close or reverses immediately after attempting to close.

Check the Power Supply

Ensure the sensors are adequately powered. Check if the wires connecting the sensor to the power supply are intact. If you see any loose wires, switch off the power, and secure them back in place.

Clean the Sensor Lens

Cleaning the sensor lens of a garage door sensor is an essential task to ensure the smooth functioning of your garage door. 

The sensor lens is a crucial part of the mechanism as it emits and receives the infrared beam that detects any obstacles in the path of the closing door. 

Over time, dirt, dust, cobwebs, and other debris can accumulate on the lens, affecting its efficiency. Now that we touched on its causes let’s take a closer look at how to clean the sensor lens properly.

Gather Necessary Supplies

Before starting, gather the necessary supplies.

You will need:

  • A soft, clean, lint-free cloth or microfiber cloth
  • Mild soap solution (optional)
  • A step ladder (if necessary)

Safety First

Ensure that the garage door is in the down position.

Switch off the power to the garage door opener to avoid any accidents.

Step-by-Step Guide to Cleaning the Garage Door Lens

  • Inspect the Sensor Lens

Begin by visually inspecting the sensor lens. Look for visible dirt, dust, cobwebs, or any other debris on the surface.

  • Dry Wipe

Using a soft, clean cloth or microfiber cloth, gently wipe away any loose dirt or dust from the lens. Be careful not to apply too much pressure as the lens can be sensitive, and you don’t want to risk damaging it.

  • Mild Soap Solution (If Needed)

If the lens is particularly dirty or has a greasy residue, dampen the cloth with a mild soap solution. Wipe the lens carefully, avoiding any excess moisture seeping into the sensor mechanism.

  • Dry the Lens

After cleaning with the mild soap solution, use a dry section of the cloth to remove any moisture from the lens surface. Ensure that the lens is completely dry before restoring power to the garage door opener.

  • Check Alignment

After cleaning, check the alignment of the sensors to ensure they are facing each other directly. Cleaning can sometimes cause slight misalignments, so adjust if necessary.

  • Restore Power and Test

Switch the power back on and test the garage door several times to ensure the sensor is working correctly. Place an object in the door’s path to see if the door reverses as it should.


Never use harsh chemicals, abrasive materials, or excessive water, as they can damage the sensor lens.

If you notice any damages, cracks, or abnormalities in the sensor lens during cleaning, consider contacting a professional for repair or replacement.

Realign the Sensors

The sensors located on either side of the garage door need to be properly aligned to communicate effectively. If one is knocked out of alignment, the infrared beam won’t connect, and the sensor will not function correctly. Loosen the screws securing the sensor brackets and adjust them until both sensors’ lights are solid and not flickering.

Check for Obstructions

Look for any objects or debris in the door’s path that may be blocking the sensor’s infrared beam. Clearing the path of any obstructions can solve the problem instantly.

Examine the Wiring

Examining the wiring of your garage door sensor is essential in diagnosing and fixing malfunctions. The wires ensure the sensors and the garage door opener are connected to power and communicate effectively.

Before starting, ensure that the garage door is in the down position and that the power to the garage door opener is switched off to avoid any accidents. If you are not comfortable working with electricity or the garage door mechanism, consider hiring a professional.

Here’s how to inspect the wiring:

What you will need:

You will need:

A screwdriver

A flashlight

A wire stripper (in case you need to fix any wires)

Electrical tape or wire connectors

A multimeter (optional, but useful for checking voltage)

What to do:

1. Visual Inspection

Start by visually inspecting all visible wiring connected to the sensors and the garage door opener. Look for any signs of wear, tear, fraying, or damage. Pay special attention to connections and ensure they are secure.

2. Check for Loose Connections

Ensure that all wire connections are tight and secure. A loose wire can result in intermittent power and sensor malfunction. If you find any loose connections, secure them tightly.

3. Look for Wire Breakage

Examine the length of the wires for any breakage. If you notice any broken or frayed wires, they will need to be repaired or replaced, as they can disrupt the power supply and the functioning of the sensors.

4. Inspect Wire Insulation

Check the insulation around the wires for any signs of damage, such as cracks, cuts, or peeling. Damaged insulation can lead to short circuits and should be addressed immediately.

5. Check for Corrosion

Inspect wire terminals and connections for any signs of corrosion or rust, which can impede electrical flow. Clean any corrosion you find and consider applying a protective coating to prevent future issues.

6. Test Voltage (Optional)

If you are comfortable using a multimeter, check the voltage at the sensor’s connections to ensure they are receiving adequate power. Refer to your garage door opener’s manual for the correct voltage.

7. Repair or Replace Damaged Wiring

If you find damaged wires, use a wire stripper to remove the damaged section.

Strip the ends of the good wire, twist them together, and secure them with a wire connector or electrical tape.

If a wire is severely damaged, it may need to be replaced entirely.

8. Reconnect Power and Test

After examining and addressing any issues with the wiring, reconnect the power and test the garage door sensor several times to ensure it is functioning correctly.

9. Regular Wiring Maintenance

Regularly inspecting the wiring of your garage door sensor should be part of your routine maintenance to prevent any issues and ensure the longevity of your garage door system.

Replace the Sensor

If the above steps don’t resolve the issue, you may have a faulty sensor. Purchase a replacement sensor compatible with your garage door system and install it according to the manufacturer’s instructions.

Test the Door

After making adjustments or replacements, test the garage door several times to ensure it is working correctly. Place an object in the door’s path to confirm the sensors are detecting obstacles and reversing the door as they should.

Seek Professional Help

If you’re unable to resolve the issue or feel uncomfortable performing any of these steps, don’t hesitate to call a professional garage door technician. They are trained to handle a variety of garage door problems and can ensure the repair is done safely and effectively.

Safety Precautions

  • Always turn off the power supply before attempting any repairs.
  • Do not attempt to repair the garage door if you’re unsure of any steps. Seeking professional help is always the safer option.
  • Regularly maintain and check your garage door sensors to avoid any malfunctions and ensure the safety of your garage.


A malfunctioning garage door sensor can be inconvenient and unsafe. By following our tips, you can troubleshoot and fix common sensor issues and ensure your garage door is operating safely and efficiently. When in doubt, always consult with a professional technician to address any concerns or repairs.

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