If your garage door won't close and the opener light blinks, the safety sensors are almost always the cause — they're misaligned, dirty, or have a loose wire. Here's how to fix garage door sensors yourself in a few minutes, and when it's time to call a pro.
The two sensors near the floor must 'see' each other. When they can't, the door won't close as a safety feature. Work through these in order.
Each sensor has a small LED. One stays steady (the sending eye); the other should glow steady too (the receiving eye). If one is off or blinking, they're misaligned or blocked — that's your problem.
Wipe both lenses with a soft, dry cloth. Dust, cobwebs, or even direct sun glare on a lens can break the beam. Move anything (bins, a parked bike) blocking the path between them.
Loosen the wing nut or bracket and gently tilt one sensor until both LEDs glow solid and steady. Tighten it back down carefully so you don't knock it out of line. They must point straight at each other.
Follow the thin wires from each sensor up to the opener. Look for staples driven through the wire, chewed spots, or loose connections at the opener terminals — a very common cause of a dead sensor.
Press the wall button and watch the door close. Then wave a box through the beam while it closes — it should stop and reverse. If it closes fully and reverses on cue, you're fixed.
If the LEDs still won't go solid, a sensor is sun-blinded all day, or the wiring is damaged, the sensor or a wire likely needs replacing. That's a quick, inexpensive fix for us — call (940) 644-4376.
A blinking sensor LED means the two sensors aren't aligned or the beam is blocked — by dust on the lens, an object in the path, or a bumped bracket. Realign and clean them and the blinking stops.
No — the sensors stop the door from closing on a person, pet, or car. Bypassing them is unsafe and against code. Fix or replace them instead; it's a small job.
The sending sensor usually has a steady LED and the receiving one blinks or goes dark when there's a fault. If cleaning and realigning don't restore a steady light on both, the dark/blinking one is likely the failed sensor.
They can — sun exposure, moisture, and age degrade the photo-eyes and wiring over years. When realigning and cleaning no longer hold, replacing the sensor pair is a fast, low-cost repair.
If realigning and cleaning didn't do it, the sensor or wiring may need replacing. Same-day, free estimate.