Place a box or similar object between the safety sensors to block the sensing beam.
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.
The door should stay open and the motor unit lights should blink.
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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.
Inspect each sensor to make sure the green or red power indicator lights are.
Chamberlain liftmaster craftsman garage door opener replacement safety sensors g801cb p includes 2 sensors mounting brackets and hardware.
Open the garage door.
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Liftmaster garage door opener pair of safety sensors 041a5034.