Repair Guides
Garage Door Sensors Blinking? 6-Step Troubleshooting Guide
A blinking safety sensor means the door is doing exactly what it's designed to do — refusing to close until it sees a clear path. Here's how to clear it in under 5 minutes.
Step 1: Look for an obstruction
Pool noodle, broom handle, leaf blower cord. The sensors fire an invisible beam 6 inches off the floor — anything crossing it will trigger the safety reverse. Sweep the track area first.
Step 2: Check sensor LEDs
One sensor is the sender (usually amber LED), one is the receiver (usually green LED). Both should be solid. If the receiver is blinking, the beam isn't reaching it — proceed to step 3.
Step 3: Realign the sensors
Loosen the wing-nut on the receiver bracket, point it directly at the sender, watch the LED. When it stops blinking, tighten the wing-nut. Most misalignments happen because someone bumped a sensor with a vacuum or a kid's bike.
Step 4: Clean the lenses
Florida pollen and dust collect on the plastic lens. Wipe both with a microfiber cloth. Spider webs are the #1 cause of intermittent sensor faults we see on service calls.
Step 5: Check for sun glare
Late-afternoon sun hitting the receiver lens at the wrong angle can wash out the beam. If your door fails to close only at 5–6 PM, this is why. A small sun shield (a strip of black electrical tape across the top of the lens) usually fixes it.
Step 6: Test the wiring
If everything above checks out, you likely have a bad sensor or a chewed wire. Lizards and rodents love sensor wiring in Florida. Visual inspection along the wire from sensor to opener will usually show the bite. Replacement is a $129–$179 service call.
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