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

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Sears Craftsman 1/2 HP Chain Door Opener

I have a technical question. I own a Sears Craftsman 1/2 HP opener. I purchased it in 12/07.
Recently my remotes would not operate the door. I have erased all codes and reprogrammed each.
Whenever I try to open/close the door using the remotes, the door opener "bumps" and the motor
lights begin to blink. One remote (master) will operate only
if you hold the button constantly until door opens/closes.
Can you please tell me what might be causing this problem?
Thanks,

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I had a problem with my craftsman 1/2 horse g.d.o.not being able to go down .it wouldnt reverse and close the door.after the second day of messing with it checking all the normal problems like the lite sensors and door binding and checking and setting the limit switches i was about to give up when i noticed that when i pressed the transmitter button to activate it to go down, there was a clicking in a selonoid that was attached to the printed circuit board.i looked it over again and again but i didnt see the problem when i deceided to use the ol "hit it with something trick" lol.well that didnt work either but what did work was to just use a insulated screwdriver and working from the circuit board side i gently pried the selenoid ever so slightely and it sparked and viola,the door went down.i guess what had happened was the selonoid had grounded itself out and it is what controls the "reversing" of the motor.this g.d.o.is 13 years old and it now works great again.so, set your limit switches ,check for any door binding and look over the printed circuit board very closely.listen for any clicking and investigate.

Posted on Oct 10, 2008

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Door sensors may not be aligned or may be blocked. otherwise, the motor power setting may be too low.

Posted on Aug 18, 2008

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