Question about Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener

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Liftmaster 4210- motor runs just for a couple of seconds-

Green light then flashes on back of unit. Have just replaced plastic gears, and put it all back together- must have done something wrong!

Can you help?



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  • marty metzger May 11, 2010

    electric eyes. Light on unit flashing. what is door doing. I ignore led lights on board.



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  • 118 Answers

You need to sync the door with the limits.

Posted on Feb 09, 2009


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