Misalignment
A bumped bracket points the sensors away from each other.
Sensors
Garage Door Sensor Lights Blinking
Most photo-eye sensors have small indicator lights. A blinking or off light usually means the beam is blocked, the sensors are misaligned or there is a wiring problem. The door may refuse to close until it is fixed.
Short answer
Clean both lenses, remove anything in the beam and gently realign the sensors until both lights are steady. If a light stays off or keeps blinking, check the wiring for damage. If that does not help, a sensor may have failed.
Likely causes
Dirty lenses
Dust and cobwebs block the beam.
Wiring damage
Loose terminals or damaged wires interrupt the signal.
Failed sensor
A sensor can fail with age or a surge. See sensor repair.
On many openers, one sensor sends the beam and the other receives it, and each has its own indicator. A steady light on the sending side with a blinking light on the receiving side usually means alignment. Both lights off often means a wiring or power issue between the sensors and the opener, which is harder to fix by eye. If the lights went out after work in the garage, check for a stapled or pinched wire along the wall first.
Safe checks you can make
- Wipe both lenses
- Remove objects near the sensors
- Realign the brackets
- Inspect visible wiring
Stop and call a technician if
- Lights stay off after realigning
- Wires look damaged
- The door reverses even with steady lights
What a technician may inspect
- Sensor alignment
- Wiring and terminals
- Sensor condition
- Opener input
Describe what the door is doing when you call. A provider may ask follow-up questions, but a reliable price normally needs an on-site look rather than a phone-only quote.
Services that address this problem
Garage Door Sensor Repair
Photo-eye sensors sit a few inches above the floor on each side of the door.
Garage Door Safety Check
Garage doors are often the largest moving object in a home.
Garage Door Opener Repair
An opener only moves the door; it should never be doing the heavy lifting.
Frequently Asked Questions
It usually means the sensors cannot see each other because of misalignment, dirt or an obstruction. Wiring faults can also cause it.
Loosen the bracket slightly, aim the sensors at each other until both lights are steady and retighten the bracket. If one light stays off, the wiring or sensor may be at fault rather than alignment.
An off light can mean no power to that sensor, a broken wire or a failed sensor. Check the wiring first.
Yes, strong direct sun into the receiver can interfere with the beam on some sensors.
Usually not with a remote. Some openers allow closing by holding the wall button, but this is only a temporary measure.
If cleaning, aligning and checking the wiring does not restore steady lights, the sensor may need replacing.
Get your garage door working safely again
Call to schedule a technician visit with an independent provider who serves your area.