Two Small Eyes Guard the Doorway
Two small sensors are mounted low on the door frame, facing each other across the opening. They send an invisible beam between them, and if something interrupts it, the opener stops or reverses. They are also easy to upset: a bump, a spider web, a low sun angle or a loose wire is enough.
A garage open to the outdoors collects more of that nuisance, since insects nest in the lenses and dust films them over. Cleaning and re-aiming solve many cases. When wires are corroded or a sensor has failed, replacement restores the protection, and we confirm the door reverses with a real obstacle.
What Sensor Trouble Looks Like
Door goes down then back up
Closing partway and reversing, with no obstacle in sight, often means the beam is blocked or the sensors point slightly apart.
Blinking or dark indicator lights
Each sensor carries a small light. A dark or flashing one suggests a wiring fault, lost power or a sensor that is out of line.
Works at some hours, not others
Low sun angles, condensation or insects at the lens can interrupt the beam at certain times of day.
How We Fix Sensors
- 1
Clean and inspect
Lenses are wiped, spider webs removed and brackets checked for looseness, a bend or a shifted position.
- 2
Realign the pair
The sensors are aimed at one another until both indicator lights hold steady, and brackets are fastened so they stay put.
- 3
Trace the wiring
Wires are followed from each sensor to the opener, and corroded, pinched or chewed sections are repaired or replaced.
- 4
Test the reversing
We run the door down onto an obstacle and across the beam, confirming it turns around every time before we leave.
Sensor Questions
- Can I disable the sensors to get the door to close?
- Please do not. Sensors are a basic safety feature, and disabling them leaves children, pets and cars unprotected. Fixing the cause is usually straightforward, whether it is a dirty lens, a bumped bracket or a damaged wire, and it keeps the door doing its job properly.
- Why do my sensors fail after rain or at sunset?
- Moisture on a lens, or low sun shining into a receiver, can interrupt the beam. A small shade for the lens, a gentle re-aim or fresh wiring often solves it, and we can suggest which fits. Insects sheltering in the housing are another frequent cause worth clearing.
- How low should the sensors be mounted?
- Only a few inches above the floor, so a small child or pet crossing the doorway breaks the beam. If yours were mounted higher, we lower them and re-aim the pair, then confirm the door turns back when we place an obstacle in its path.
Closing, Then Reversing for No Reason?
Mention what the small indicator lights are doing and when the trouble appears, and you will hear the likely cause.
Talk through the sensor trouble — (239) 388-7750