It isn’t always evident that the garage door sensor is in bad shape or not functioning. However, there are a couple of common signs which should indicate that the sensor is not working. The most obvious sign perhaps is that the garage door does not open and close properly. If you experience this issue, check the sensor path to see what is stopping the door from closing. Most garage doors have this sensor as a safety mechanism to prevent personal damage or damage to belongings.

A couple of other signs that your sensor isn’t functioning as it should is missing sensor light, issues with a flashing Garage Door Opener light, or the sensor may be flashing. Now that you know that there is an issue with your garage door’s sensor, what is the next step? We will look at what you can do below.

Check if the Sensor is Receiving Power

One of the most common reasons for the sensor not working is that it isn’t getting power. You will want to check the small LED lights around the sensor. If they are on, then there is no issue with the power supply. However, if you discover that the lights are off in either one or maybe both the sensors, then you have an issue with the power supply. You could try unplugging and then re-plugging the power to see if it turns on.

Dirty Sensor Lenses

It isn’t uncommon for the sensor lenses to become dirty. However, when this happens, you need to clean the lenses. Often water, dirt, pollution can cloud the lenses. A simple cleaning rag and some alcohol should be able to clean the sensor.

Moisture Around the Sensor

At times there may be moisture around the sensors, which can cause it to malfunction. It could happen if the sensor was exposed to water from a recent wet spell or the sprinkler system. The simple solution is to dry the sensor and retry.

Misalignment of the Sensors

When both of the sensors aren’t aligned, then the garage door may not work properly. You will want to check the LED lights on both the sensors to verify if they are working. Both sensors should display a green light if there are OK. When you see either flashing or red lights, then you have a problem. Check their alignment, realign, and see if that fixes the issue.

Wear and Tear

At times your sensor may be the victim of regular wear and tear. It can especially be the case if the garage door or the sensor has been in use for many years. The best thing to do in this case is to get the sensors replaced. Fortunately, it is a relatively easy job for most Garage Door Professionals.


In addition to the above, there are many other reasons why your garage door sensors may not be working. If above aren’t the issue, then call a professional to help you troubleshoot.