Last Tuesday at 7:14am a customer in Doral called us. Every time she pressed the button to close her garage, the door would start down, then reverse two feet back up. She’d already tried it eleven times before she gave up and called. By the time my dad rolled up forty minutes later, she was sitting on her front step with her work bag, late for a 9am meeting at MIA. The fix took ninety seconds. The cause? Two spider webs across the photo-eye lens — the kind that go up overnight in Miami summer.

If your garage door reverses when closing in Miami, you’re almost certainly looking at a photo-eye sensor problem. We get this call about three times a week from June through October, and the fix is usually free if you know what to look at. Here’s the full diagnosis flow we use.

How the photo-eye sensor actually works

Every garage door opener installed in the US since 1993 has two small sensors mounted four to six inches off the floor on each side of the door — one with a sending eye, one with a receiving eye. They shoot an infrared beam across the opening. When the beam is broken, the door knows something (your kid, your dog, your bumper) is in the way and refuses to close, or reverses if it’s already moving down.

Federal regulation UL 325 made these sensors mandatory after a string of fatal entrapment accidents in the late 1980s. So no, you can’t disable them — and any so-called “bypass” instructions you find online will void your warranty and your insurance the moment something goes wrong.

Why Miami breaks photo-eye sensors faster than anywhere else

Three things stack up in our climate:

1. Spider webs. Banana spiders love the sheltered corners next to garage door tracks. A single web across the lens looks like an obstacle to the sensor. We probably solve 60% of “my door won’t close” calls with a microfiber cloth.
2. Humidity and salt air. Miami coastal homes (Miami Beach, Key Biscayne, parts of Coconut Grove) corrode the sensor terminals about 30% faster than inland homes. The connection gets flaky long before the sensor itself fails.
3. Tropical storm jolts. A wind-loaded garage door panel slamming against the track can knock a sensor bracket out of alignment by half a degree — which is enough to break the beam.

A working pair of sensors will show one solid LED on the sender and one solid LED on the receiver. If either one is blinking, dark, or flickering, that’s your problem.

The 10-minute DIY diagnosis

Before you call anyone, run through this in order:

1. Look at both LED lights. One side has a green LED (sender), the other has a red or amber LED (receiver). Both should be solid. If either is blinking, you have a misalignment or obstruction issue. If either is completely dark, you have a wiring or power issue.
2. Wipe both lenses. Use a dry microfiber cloth first, then a slightly damp one with plain water. Skip the Windex — the ammonia clouds the plastic lens over time. If you’ve never cleaned them, you’ll be surprised how much dust and webbing comes off.
3. Check that they’re aimed at each other. The beam is invisible but the sensors should be pointed straight across, parallel to the floor. Eyeball it, or hang a string between them as a guide.
4. Tighten the mounting brackets. Two screws hold each sensor to the track. Snug them with a Phillips head — we see at least one Doral customer a month whose sensors are flopping around because the bracket vibrated loose.
5. Trace the wires. Two thin wires run from each sensor up to the opener motor. Look for chew marks (rodents in the attic happen more than people think), cracked insulation near where the wire bends around the track, or a wire pulled out of a terminal.

Eighty percent of customers who run that checklist find the problem in step 2. (I once spent twenty minutes diagnosing sensors in West Kendall before noticing a dust mop leaning against the wall, blocking one beam. Charged her nothing and we both laughed about it.)

What this costs in Miami in 2026

Here’s the honest pricing range we see across South Florida this year:

• DIY clean and re-aim: $0. Ten minutes, a microfiber cloth, and a Phillips screwdriver.
• Service call for diagnosis + alignment: $89–$129. We come out, fix it on the spot in 95% of cases, no parts needed.
• Single sensor replacement: $145–$190 parts and labor. Universal LiftMaster or Genie sensors are cheap; the labor is the bigger chunk.
• Both sensors replaced: $180–$220. We almost always replace as a pair when one fails — the other is the same age and usually a few months behind.
• Sensor wire replacement (rodent or sun damage): $180–$260, depending on how much of the run we have to pull through the conduit.

Why does the same job cost more in Miami than in, say, Atlanta? Two reasons. The salt-air humidity causes sensors to fail 30% sooner, so labor warranty has to be priced in. And we hit traffic on the Palmetto and 836 enough that drive time is a real input — anyone telling you their flat rate is $59 is either making it up or about to upsell you on a $400 opener you don’t need.

If you’re already due for a garage door tune-up, bundle it. We rebalance, lubricate, and check sensors as part of the same visit and it works out to less than calling us twice.

When to call us, when to DIY

Handle it yourself if:

• Both LEDs come on after cleaning the lenses
• The brackets just need tightening
• You can see and reseat a popped wire connector
• The door closes fine if you hold the wall button down (some openers let you override briefly — the photo-eye is just dirty)

Call us if:

• Both LEDs stay dark after you’ve checked power to the opener
• The lenses or terminals are visibly corroded (white powder, green oxidation)
• The door reverses with no obstacle, both LEDs solid, lenses spotless — that means the safety logic in the opener motor itself may be failing, which is a board-level repair
• You’ve already tried twice and it’s still happening — at that point you’re paying us to do what you would’ve, and the third try usually loses you another hour

Most of our emergency garage door repair calls in Doral, Kendall, and Pinecrest start as photo-eye problems and turn into something else once we’re on site. Catching it at the sensor stage is the cheap version.

Related reads

• 5 Signs Your Garage Door Spring Is About to Break (And What to Do)
• Garage Door Repair Miami Beach | CMC Door Service
• Garage Door Repair Miami Lakes | CMC Door Service
• Garage Door Repair Doral | CMC Door Service
• Garage Door Safety: 7 Critical Tests Every Miami Homeowner Should Know
• Blog
• Choosing the Right Garage Door for Your Miami Home: A Complete Buyer’s Guide
• Terms and Conditions
• How Much Does Garage Door Repair Cost in Miami? (2025-2026 Guide)
• Garage Door Financing Miami
• Garage Door Off Track Repair Miami
• Garage Door Panel Replacement Miami
• Areas We Serve
• Customer Feedback
• Contact Us
• Privacy Policy

FAQ

Why does my garage door close one foot then reverse?

The photo-eye beam is being broken partway through the close cycle — usually by something at floor level (a leaf, a piece of mulch, a kid’s toy that slid into the threshold), or by a misaligned sensor that’s drifting in and out of alignment as the door vibrates.

Can I bypass the photo-eye sensors?

No. UL 325 has required them on all residential garage door openers since 1993, and disabling them is a federal violation in addition to making your home insurance invalid in the event of an injury. There’s no good reason to do it — if the sensors are bad, replace them.

How long do photo-eye sensors last in Miami?

We see them last 6 to 10 years on Miami homes, vs 12 to 15 in drier climates. Coastal homes (Miami Beach, Key Biscayne) are at the lower end of that range because of salt-air corrosion on the terminals.

Can I clean the photo-eye lens with Windex?

Prefer a dry microfiber, then a damp one with plain water. The ammonia in glass cleaners gradually clouds the plastic lens, which makes the sensor more sensitive to dust and slight misalignment. We’ve replaced sensors that didn’t actually need replacing because the previous owner Windex’d them for ten years.

Both LEDs are off completely. Is my breaker tripped?

Check the opener motor first — if the motor light comes on when you press the wall button, the breaker is fine and the issue is on the sensor circuit. If the motor is also dead, you’ve probably got a tripped GFCI in the garage outlet (look for a “reset” button on the outlet itself before going to the panel).

If you’ve cleaned the lenses, tightened the brackets, and the door still reverses, you can text us at the shop and we’ll roll a truck — we usually answer within 10 minutes during business hours.