Signs Your Sensors Need Attention
Door won’t close
Opener light blinks 10 times — the sensors aren’t seeing each other.
Reverses right before closing
Sensor eyes are slightly misaligned — the beam breaks at the last inch.
Solid red LED
One sensor is receiving power but not seeing its partner’s beam.
No LED at all
Wiring failure, chewed wire, or dead sensor — needs testing.
Works sometimes
Sun glare, spider webs, or vibration-loosened mounts — intermittent issues.
Sensor was knocked
Bumped by a snowblower, kids, or a foot — realignment usually fixes it.
Wet after storm
Moisture in the sensor housing — needs drying or replacement.
Chewed sensor wire
Rodents love the low-voltage wiring — splice or full re-run needed.
How We Diagnose and Fix Safety Sensors
First step is always testing: are both sensors powered? Are the LEDs on? Is one solid and one blinking? A blinking sending-side LED almost always means alignment; a dead LED points to wiring. We carry replacement sensor pairs for every major opener brand — LiftMaster, Chamberlain, Genie, Craftsman, Sommer — on the truck.
Alignment fixes are typically 10–15 minutes: loosen the wing nuts, aim the eyes until both LEDs go solid, tighten. Wiring repairs run longer if we need to trace a chewed wire back to the opener. Most sensor calls are done in under 30 minutes.
- Every major opener brand supported
- Sensor pairs stocked on the truck
- Wiring splice & re-run when needed
- Full safety-reverse test before we leave
“Sun coming through the west-facing window was blinding the sensor every afternoon. Fifteen-minute fix I never would have figured out.”
— Homeowner, Kaukauna, WI
Frequently Asked Questions
Why does my garage door reverse right before it closes?
Safety sensors at the base of the tracks are slightly misaligned. The beam is breaking at the last inch of travel, which signals the opener to reverse. Alignment fixes it in about 10 minutes.
Can I bypass the sensors?
No — it’s illegal for a technician to disable them, and unsafe. Federal law has required photo-eye sensors on garage door openers since 1993. If yours won’t work correctly, they need repair, not bypass.
How is sensor repair quoted?
Realignment is the quickest job. A new sensor pair costs a bit more. Wiring repairs depend on how much wire needs re-running. We diagnose in the first ten minutes, then quote before we start any work.
Do all opener brands use the same sensors?
No — LiftMaster/Chamberlain/Craftsman share a family. Genie, Sommer, Marantec, and Linear each use their own. We stock replacements for all major brands.
Why is the sensor LED blinking?
Blinking usually means misalignment. Solid LEDs (both sides) mean the beam is intact. No LED means power or wiring failure.
Cities We Cover in Brown County
Need Garage Door Safety Sensor Repair?
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