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How to Test Garage Door Sensors

If you have problems closing your garage door and there doesn’t seem to be anything tripping the sensor, you need to know how to tell if there’s something wrong with your garage door sensor. Learning how to test garage door sensors can help you to identify the problem and determine whether you can fix it on your own or hire a garage door expert to help you out.

How to Test Garage Door Sensors

In this post, we’ll identify some of the most common issues that can cause your garage door sensor to malfunction. Watch out for these signs and you can get an idea of how to handle the problem when it comes to this sort of garage door technology.


How to Tell If Your Garage Door Sensor Is Bad

Telling if your garage door sensor is bad can be a bit tricky. However, there are common signs that indicate you have a malfunction. For instance, the most obvious sign is when your garage door doesn’t close properly. Once you discover the problem, the first thing you need to check is the sensor path, as the door will not close if any objects are blocking the path. This is a common safety feature designed to prevent injuries or damage to property. Other signs to watch out for include flashing garage door opener lights, flashing sensor lights, or a missing sensor light.


Here Are Five Things to Check:

Sensor Path

Generally, your garage door sensor will prevent the door from closing if there’s an object nearby so you want to make sure nothing is obstructing the sensor beam.

Sensor Power

A lack of power supply is one of the most common causes of a malfunctioning garage door sensor. Look for small LED lights on the sensors. If the lights are turned on for both sensors, then you can rule out a problem with the power supply. If the lights are off in one or both sensors, however, it points to an issue with the power supply.

Sensor Lenses

Sensor lenses will often be covered in dirt. This occurs if there’s a lot of pollution or wind near your home, you live close to an intersection or you rarely clean your lenses. All these can cause dust to pile up on your lenses, blocking the sensor from functioning properly. Give the sensors lenses a good cleaning to restore optimal functionality.

Sensor Moisture

Sometimes, if the area in and around the sensors is wet, the sensors can malfunction. This may occur if the sensors are exposed to rain or water from your sprinklers. If that’s the case, just dry them with a clean piece of cloth.

Sensor Alignment

Make sure that both sensors are aligned with each other because if they’re not, they won’t work properly. You can check this by simply looking at the LED lights on both sensors.

Sensors Wear and Tear

Sometimes the problem may be that the sensors have succumbed to normal wear and tear. This is especially the case if you’ve been using the same sensors for over a decade.

Bottom Line

Now that you know how to test garage door sensors, you can take appropriate action based on the issue. While some problems can be sorted out with a quick fix, others require the expertise of a seasoned garage door professional like our experts here at Metro Garage Door. If you’re unable to fix the problem, be sure to seek the services of a professional garage door expert.

Request Service Today

We’ll fix your garage door problem fast! Call us before 1:00 PM and we’ll send an expert technician to fix your door on the same day. Call during our regular or extended service hours to talk to a customer service representative.

South Metro: (952) 960-9411 | East Metro: (651) 967-7373
North Metro: (763) 219-4326 | West Metro: (612) 276-3891

Top Rated Garage Door Company in the Twin Cities Metro Area

Super Service Award Winner

No other Garage Door company in the area has been awarded the Super Service Award every single year running. Hundreds of satisfied homeowners and commercial property owners just like you continue to recognize Metro’s exemplary services, via positive reviews, earning Metro the Angie’s List Super Service Award for 16 years.

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Metro is also proud to be a longstanding accredited business with the Minnesota Better Business Bureau, earning their highest possible rating.

Over 280 Verified Customer Reviews

We’ve been providing affordable, same-day service to residents of Minneapolis – St. Paul and surrounding Twin Cities metro for over 35 years. Read what our satisfied customers have to say and why Metro Garage Door ranks as the top-rated garage door repair company in Minnesota.

What People Are Saying About Metro Garage Doors

Top Rated Garage Door Company in Minneapolis – St. Paul, but don’t take our word for it…
Very happy experiences with Metro Door. We've used them before, to install a new opener and for repairs from backing into the door. Always prompt, professional, friendly, and reasonably priced. This time, we needed to replace a 30-year-old opener on our seldom-used small door. After analyzing our situation, the technician, Randy, provided a much better strategy -- moving the 5-year-old opener to the small door and installing the new opener on the big door (the one we use all the time). This also allowed us to install a really quiet belt-driven opener on the big door. Thanks Randy! Great experience all around.
Kathy Johnson

Google Review

I had a new garage door installed. My initial garage door had a weird problem -- it opened by itself! Our technician came out and was just fantastic. He replaced the opener (the maker of the opener, for instance, tried to send me a part that I could replace on a week-old opener). They fully replaced the opener and the wire and it works great. And Randy was exceedingly professional and helped me understand everything. Great service.

Jonathan Maze

Google Review

Outstanding service and great pricing! My garage door flipped out and luckily someone referred me to this firm. From the minute they answered my call until the door was fixed, they were simply great. Very prompt, courteous and very trustworthy. The tech was Dana and he was just wonderful answering all my questions and making excellent suggestions. The door has never operated so well and so quiet!. Thanks again for a great job.
Joan Brandes

Google Review