Safe-T-Beam misaligned or obstructed (at the eye)

This one is read at the sensors themselves rather than the motor head: a blinking red LED on the Genie Safe-T-Beam receiving eye means it can't see the sending eye. The beam is blocked, or the brackets have been bumped out of line — a very common thing when bins, cords, or leaf piles collect near the door. A steady red on the source side is normal and just signals power, so it's the receiver's blink you're chasing.

It's usually a two-minute DIY fix. Remove whatever crosses the beam path, then loosen the wing nut and pivot the receiving eye until its LED stops blinking and goes solid. Both eyes showing steady lights means the beam is made and the door will close again. If you've cleared the path and aligned the eye and it still blinks, the wiring or a sensor unit may have failed — that's when a tech's look is worth it.