How to replace a garage door opener safety sensor

Use a step ladder to access the garage door opener’s power cord and motor unit. Unplug the garage door opener.

Remove the wing nut from the safety sensor.

Pull the sensor from the bracket.

Cut the wires about an inch from the safety sensor, leaving enough slack in the control wire to connect the new sensor.

Repeat the process for the other safety sensor.

Separate the control wires on the new sensor.

Connect the black-striped control wire to the black-striped safety sensor wire using the crimp wire nut.

Connect the solid white wires the same way.

Repeat the process for the other safety sensor.

Slide the safety sensor into its bracket and secure it with the wire nut.

Repeat the process for the other safety sensor.

Plug in the garage door opener.

Align the safety sensors so the green indicator light on the receiving sensor glows steadily.

Open the garage door.

Place a box or similar object between the safety sensors to block the sensing beam.

Attempt to close the garage door using a remote.

The door should stay open and the motor unit lights should blink.

If the garage door opener closes the door with the safety sensors blocked, replace the logic board.