The door should stay open and the motor unit lights should blink.
Garage door repair sensors.
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Raise the garage door using the control button on the garage wall or the remote control unit from a vehicle.
Place a box or similar object between the safety sensors to block the sensing beam.
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If the garage door opener closes the door with the safety sensors blocked replace the logic board.
Attempt to close the garage door using a remote.
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Inspect each sensor to make sure the green or red power indicator lights are.