Genie Garage Door Sensor Blinking Red | Reason Why It Blinks Red

Garage doors keep life on track when you open and close the driveway. With the push of a button or a quick key combination on the keypad, the door raises or lowers to help protect property. When a garage door breaks or doesn’t open or close properly, it affects daily life. A common issue with garage doors is when the sensor is shifted, flashing red. In this guide, I will discuss why the genie garage door sensor blinking red and its solution.

Genie Garage Door Sensor Blinking Red

Is your garage door sensor flashing red? First of all, it is important to understand how garage doors work before trying to fix the issue on your own.

A garage door requires a safety sensor that prevents a person or object from closing the door. Each garage door must be equipped with sensors capable of detecting if something is in the way before the door is closed.

Sensors are a key part of automatic garage door security. The sensors can change the direction in which the door is closed if they detect an object in the door’s path. Then the door returns to the open position. If the sensors stop working, this is annoying and also poses a serious safety risk. If the Genie safety sensors are not aligned, the red reversing sensor light bulb will flash.

Four Red Blinks: This is the most common reason open lights blink due to misalignment of the sensor eyes. If an object has lost its sensory eyes, it interrupts the electron beam, preventing the garage door closing properly. The door will stop and start going up again.

Five red flashes: It indicates that your engine may be overheated or have a faulty engine speed (RPM) sensor. Unplug your device to restart it. If it continues to flash, the RPM sensor needs to be replaced. If the engine block still does not work, it has overheated, and the motherboard needs to be replaced.

Six red flashes indicate an engine circuit malfunction. The motor unit does not work completely, so the motherboard of the receiver must be replaced. 

How to Check the Garage Door Sensor?

You can test the effectiveness of your garage door sensor now that you understand how it works. Determining if the garage door sensor is faulty is fairly straightforward. Once you determine that the sensors’ issue, the solution is often fairly easy to do yourself.

To test a garage door sensor, you need an everyday object like a cardboard box. Place the box in the line of the sensor and try to close the garage door. If the door turns over after detecting an obstacle, your door is functioning properly. If the door closes behind a drawer, you need to troubleshoot and look for signs to determine what is wrong with the sensors.

Signs to Look For:

If your garage door sensors are malfunctioning, you can troubleshoot to determine the root cause. Several signs can help you identify the underlying issue with your garage door sensor. After checking them, you can decide to fix the issue yourself or contact a professional. Look for these three signs:

Indicator Lights

An easy way to tell if your garage door sensors are not aligned is to check if the external LED is flashing when you try to close the door. Green LEDs indicate that the sensors are working, and red LEDs indicate that the sensors are not aligned. If you notice a red light, check the bracket or tighten the blink sensor’s screw. You’ll know you’ve fixed the sensor if the light stops flashing and your garage door closes properly.

Learn More: How To Repair A Garage Door That Closes Then Opens Again

Dirty glasses

Sometimes only a clean rag is needed to repair garage door sensors. Touch lenses may not work when dirt or cobwebs are blocking their view of the garage door opening. By wiping the lenses, the door can work normally. You should clean your sensors regularly if your garage is extremely dirty or if your area is known for its dust.

Damaged Wires

The wires used to connect the garage door sensor system can wear out due to regular use, weather conditions, and even noise. Rain and wind, pest infestations, and the use of tools can affect the wires. Check the wires for water damage, chew marks, or other signs of tampering. You may need to replace if this is the case.

After completing these steps, check the garage door again with another cardboard box. This test provides an easy way to determine if you have fixed the issue or need to call a garage door specialist.

What are the Steps for Replacing Garage Door Sensors?

The replacement is not that difficult and will only take 15-20 minutes. To replace garage door sensors, you need the following tools:

  • Stairs
  • Pliers
  • Work gloves
  • Tweezers
  • Protective glasses
  • Blue wire nuts


  • Using a ladder, locate the garage door remote control power cord and unplug it. Then unscrew the wing nuts from the sensors and remove the sensors from the brackets.
  • Cut the wire attached to the sensor to about 1 inch long. This line will be used to attach the new sensor, so leave enough slack. You also connect the black and white control wire from the new sensor to the old black and white wire using the blue nut. Repeat with the other sensor.
  • Once they connect, go to the white control wire. Connect the new sensor to the old white wire using the other nut on the blue wire. Repeat on both side
  • They are good when the red and green lights are on continuously.
  • Test the sensors by placing an object between them to block the beam. Try to close the garage door with the remote control. The door should not close, and the motor lights should flash.

Frequently Asked Questions

Can I bypass the garage door sensors?

Yes, keep the wall button pressed (do not press or release). You must hold the wall switch until the garage door hits the ground, then release it. If you release the button before the door hits the floor, the sensors will work again, and the door will open.

Does the Genie garage door remote include a reset button?

Most garage door openers are easy to reprogram, and most garage door openers can reset using a simple procedure. DIP (two-line dial) switches and radio frequencies used to operate older garage door openers. Newer models, on the other hand, often use wireless technology.

Why doesn’t Genie’s garage door close?

A clogged channel between the sensors, dusty eyeballs, loose wires in the sensors or the motorhead, or damaged sensors is all possible causes. To close the garage door, the transmitters (remote controls) do not operate. You can also try unplugging and replug the garage door opener’s remote.

Why is the Genie garage door sensor flashing red?

The sensors are not aligned, as indicated by the red lights. If you notice a red light, check the bracket or tighten the blink sensor’s screw. 

You will know you have fixed the sensor if the light stops flashing and the garage door closes properly.

Why is the garage door keypad flashing red?

The PIN was entered incorrectly if the LED blinks fast. Re-enter your PIN and try again after the LED stops blinking. After the door starts moving, any keypad button will control it for 30 seconds. The red LED blinks fast to indicate an error.

Is it compulsory for my Genie garage door sensors to be green?

An infrared beam of light is used to operate garage door keypad sensors. A light is usually present on each sensor. One will show a green light to indicate that the devices turn on, while the other will be red to signal that there are no constraints between the sensors.

Is there a reset button on the Genie garage door control?

For at least 3 seconds, press and hold the square “Install Program” button. Keep the button pressed until the round LED lights up. The oblong LED next to the circular LED will flash purple. This will put your opener into programming mode, which will allow you to reset the device.


Garage door sensors are an important component of the garage that can malfunction and endanger your safety. If you cannot handle the problem on your own, you may need to get assistance from a professional garage door service.

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