Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Motor humms but door doesn't go up or down!

My Craftsman 1/2 hp garage door opener model #13953920D isn't working. It's giving me 5 flashes from the green diagnostic light & makes a humming sound but doesn't move. It worked fine before I crosswired the opener/clicker button between red & white. Did this do something to the motor unit or logic board that is irreversible? Please advise.

Thanks,

Tyler

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5 flashes is the code for "RPM sensor board or motor overload." If your door is stuck in the open position the trolley may be jammed against a bolt just in front of the motor unit. Remove the bolt and run the opener until the door is closed. Now locate the 'up limit' control on the side of the motor unit and turn it a couple turns in the opposite direction of the arrow printed on the cover. Be sure to replace the bolt.

Posted on Sep 28, 2009

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