The two small photo-eye sensors mounted near the bottom of your door's track are a federally mandated safety feature — they stop the door from closing on a person, pet, or object by detecting a broken beam between them. When they're misaligned, dirty, or wired incorrectly, the door will often refuse to close at all, or it'll close partway and reverse.
This is one of the most common 'opener is broken' calls we get that actually turns out to be a quick sensor fix — worth checking before assuming you need a new opener.
Signs You Need This Service
- The door won't close, reversing back open every time
- One or both sensor LED lights are off, flashing, or dim
- The door closes fine in the evening but not in bright morning sun (sunlight interference)
- The door closes only when you hold down the wall button (bypassing the sensors)
- A sensor bracket is visibly bent, knocked loose, or pointed at an angle
Why This Happens in Jacksonville
Sensors get knocked out of alignment more often than people expect — a stored bike, a trash can, or even a determined weed growing along the track can nudge a bracket just enough to break the beam's true alignment. Direct morning sun hitting a sensor lens is also a real, common issue on east-facing garages in Jacksonville.
Our Process
Check both sensor lights
A steady light on both units (rather than flashing) is the first diagnostic step.
Clean lenses and re-aim
Dust, cobwebs, and pollen are wiped away and brackets are re-aimed until both lights read steady.
Inspect wiring
Sensor wiring run along the floor is a common spot for nicks, pinches, or rodent damage.
Shield from direct sun if needed
For east- or west-facing garages, we add a simple shade fix if direct sunlight is the recurring cause.
Full close-cycle test
We test with an object placed in the beam path to confirm the safety reversal still works correctly.
What Affects Pricing
Most sensor issues are resolved as a quick on-site repair; full sensor replacement is needed less often and is priced as a small parts-and-labor job.
- Realignment vs. full sensor replacement
- Wiring repair if damaged
- Bracket replacement if bent or broken
Frequently Asked Questions
Why does my door work fine at night but not in the morning?
Direct sunlight hitting a sensor lens can wash out the receiver's ability to read the beam — it's a very common, very fixable cause.
Can I just unplug the sensors so the door closes?
It's possible mechanically, but we strongly advise against it — it removes the safety feature that stops the door from closing on a person or pet.
Related Services
Opener Repair
Learn moreRemote & Keypad Programming
Learn more