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Atlanta, GA · photo eye service

Garage door sensor not working? Start with pollen and the last storm

Free estimate, nothing owedMatched pairs on boardWindows planned around traffic
  • Free estimate, nothing owed
  • Matched pairs on board
  • Windows planned around traffic
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Home › Garage Door Sensor Not Working

Real jobs. Real photos.

Every photo here is from our own work, with our logo on it.

Broken spring, then fixed: before and after photo from one of our jobs
Broken spring, then fixed
New remotes, set up on site, photo from one of our jobs
New remotes, set up on site
New door and opener, photo from one of our jobs
New door and opener

In April the whole metro wears a coat of yellow pine dust, and by July the air in a closed garage is thick enough to fog glass. Both land on the two small eyes at the bottom of your door, and both can stop it from closing. So can a thunderstorm surge or a recycling bin rolled a little too far in. Estimates are free.

A beam across the threshold

Two small sensors face each other across the bottom of the opening. One projects a narrow infrared line; its partner on the far track expects to receive it without a break. Whenever the door is on its way down and that line is interrupted, the opener throws it into reverse. Residential openers sold in the U.S. have worked this way for three decades, and it's why garage doors rarely hurt anyone anymore.

It also means a door that keeps bouncing back up is usually telling the truth as it understands it. Something, real or imagined, sits in that infrared line. Our job is working out what the sensors think they see, which is almost never a reason to replace the opener.

In a metro where two cars, a stroller and the lawn crew's gear often share one garage, that line gets crossed far more than people realize.

A house with an attached garage in Atlanta, GA

Reading the indicator lamps

  • Each sensor carries a tiny lamp. The sender and receiver usually use different colors, commonly green on one and amber or red on the other, though brands vary.
  • Both glowing without a flicker: the pair can see across the opening, and the fault lives in the opener's limits, its force setting, or springs too tired for the door.
  • Receiver dim, blinking or dark: the infrared line isn't landing. Think crooked bracket, dusty or fogged lens, or clutter in the way.
  • Both dark: the sensors have no power. That usually means the thin low-voltage wire, a loose connection at the opener's terminals, or a staple that pierced the insulation years ago.

Leave the settings alone. Describing the lamps when you call is plenty, and it tells the technician which parts to load.

A garage door roller in its track in Atlanta, GA
Tools OnPoint Pro Doors Atlanta carries for garage door repair in Atlanta, GA
Bottom bracket, lift cable and roller on a garage door in Atlanta, GA

What trips the beam in metro garages

From the most frequent find to the least:

  1. Everyday clutterA stroller parked by the track, a stack of pine straw bags, the dog's water bowl, a toddler's trike. Townhome garages with a tandem bay leave very little room, and anything nudged against the wall can end up in the line.
  2. Pollen and foggingSpring pollen settles on the lenses along with everything else, and in muggy weather a cool lens can mist over the way a bathroom mirror does. Either can dim the line enough that the receiver gives up.
  3. A shoved bracketSensor brackets are thin steel. A bumper squeezing into a tight bay, a rolling cart or a weed trimmer catches one and twists it off target. After a couple of those the bracket won't stay put, so it gets swapped rather than bent again.
  4. Evening glareWest-facing doors catch a low sun late in the day, and a sunbeam aimed straight into the receiver blinds it. If trouble starts around the same time every afternoon, that's the tell.
  5. Lightning and wiringStorm surges travel along the house wiring and can kill a sensor or the opener's sensor circuit. In damp garages the wire's splices corrode, and anything stapled too tightly eventually breaks through the insulation. Lightning season also cooks the little circuit boards inside the sensors themselves.
The wall control on a garage door opener in Atlanta, GA

Door stuck open after dark

An open garage at night is an open side door to the house, especially in a two-story where the bedrooms are upstairs and nobody hears a thing. Tell us it won't shut and it goes ahead of routine work; the technician leaves with a matched pair aboard, and the arrival window allows for the connector and the perimeter.

It's tempting to unscrew the sensors and aim them at each other on a shelf so the door will finally close. Please don't. The door then closes with nothing guarding the opening, which is how pets and kids get hurt.

When the lamps look perfect

Steady lamps, nothing in the way, and the door still turns around? Then the opener is reacting to something other than the beam. If it reverses the moment it touches the slab, the close limit is set too deep. If it reverses halfway and the door feels heavy by hand, the springs have weakened and the opener is hitting its force limit.

Georgia humidity adds to that. Wood jambs swell, rollers rust, and after a wet week the rubber seal can cling to the concrete, so the door takes more effort to move than the force setting allows. That's why the door gets checked alongside the sensors.

Replacing sensors

Moisture, surges and the occasional bumper eventually finish a sensor. We carry matched pairs for LiftMaster, Chamberlain, Genie and the other common brands, and because the two halves are made to work together, both are replaced at once.

Damaged wire comes out and a fresh run goes up in insulated clips, clear of the tracks and anywhere bikes or tools get leaned.

Both sensors are set at the same low height, square to each other across the opening. A bracket that has been straightened before gets replaced, since it will wander again.

Tandem bays and extra-deep garages mean longer wire runs, so the technician checks the whole length rather than just the ends.

Our sensor visit, step by step

The technician works from the simple to the less simple: clutter in the line, the lens faces, the aim, then the wiring to the opener. A sensor that has failed is replaced together with its partner. Before wrapping up, the opener is disengaged and the door raised by hand, because a reversing door often has a spring or roller issue hiding underneath.

Most visits are brief. If the door needs more than sensors, you hear exactly what and why first.

Myths we hear on sensor calls

"The motor must be going." Rarely. A door that reverses for an obstruction is behaving exactly as designed.

"Just take the sensors off." They're the reason closing doors don't injure people. We repair them and leave them working.

"New eyes mean a new opener." A replacement pair connects to the unit already hanging from your ceiling.

Sensor questions from metro homeowners

Can pollen really stop a garage door?

Yes. A heavy coat on a lens dims the infrared line, and the receiver treats a weak line the same as a blocked one. It's one of the most common spring calls we get, and the lenses are cleaned and the pair lined up again on the visit.

The door stopped closing right after a thunderstorm.

Surges can damage a sensor, the wire, or the opener's sensor circuit. The technician tests each in turn with a meter, and a surge protector at the opener's outlet is worth adding afterward.

One lamp is out. Which sensor is broken?

Probably neither. The receiver's lamp goes out whenever the line isn't reaching it, so aim, lenses and clutter are ruled out before any part is replaced.

Why does it only fail in the late afternoon?

The setting sun is reaching the receiving eye. Moving the receiver to the shaded side or adding a shade ends it.

Will the estimate be free?

Yes, everywhere we work in the metro, and you hear whether new sensors are needed before anything is done.

How fast can someone get here?

Often the same day. A garage that won't shut outranks routine work on the schedule.

One call to book

Whether you're in Decatur, Dunwoody, Marietta or Snellville, a single call sets up an arrival window that already allows for traffic, and the technician phones while heading over. Nobody guesses at a door they haven't seen.

Free estimate across the metro, including Decatur, Sandy Springs, Dunwoody, Roswell, Marietta, Kennesaw, Johns Creek, Douglasville and Gwinnett.

Sensors holding the door open? Let us take a look

Describe the lamps and the door, and we'll tell you straight whether it needs a visit today. Estimates are free anywhere in the metro.

Rather say it out loud? Call (770) 629-9647.

Describe the sensors for us

Which lamps glow and what the door does. We don't bill for estimates.

Or just call (770) 629-9647 and talk it through.

Other garage door work we take on