- Sensor logic active: The opener refuses to close (and may flash the light) if it does not see a valid beam. Confirm the receiver LED is solid.
- Wiring reversed or shorted: Make sure the sensor wires are on the correct opener terminals and are not shorted together anywhere along the track.
- Obstructions or reflective floors: Shiny floors or standing water can reflect infrared. Adjust the sensor angle slightly.
- Wall console lock: Some wall stations have a lock or vacation mode. Unlock it and test again.
If everything checks out and the door still will not close, the sensors may be defective. See replacement photo eyes and brackets.