The door should stay open and the motor unit lights should blink.
Garage door safety sensor replacement.
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Place a box or similar object between the safety sensors to block the sensing beam.
Garage door sensors are a very important safety feature on your garage door opener.
Chamberlain liftmaster craftsman garage door opener replacement safety sensors g801cb p includes 2 sensors mounting brackets and hardware.
This replacement garage door safety sensor kit uses an invisible infrared beam across the opening of the door the system detects any object passing through the led beam of light and automatically reverses the closing garage door.
Attempt to close the garage door using a remote.
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If your opener does not have garage door safety sensors or they are not working you should repair them replace them or get a new garage door opener.
41a5034 liftmaster sears craftsman sensor cells photo eyes garage door opener.