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

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Our garage door is not opening with the wall unit or remotes. When I push the wall unit I hear a click from the ceiling unit. The door operates fine manually. The green light on the ceiling unit (the SRT button I believe) keeps blinking periodically. The wall unit has a green light that is lit (not blinking). I've tried holding the SRT button since it appears it needs reset somehow but that hasn't worked. Any suggestions?

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  • Paul Bade Oct 13, 2010

    By "operates fine manually" do you mean you can pull the door open and closed using only muscle power? If so, can you see the opener mechanism moving normally? I assume this is a chain-drive system; I would expect a screw drive would not be movable manually unless the screw nut or its attachment to the door is broken.

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The green light on the motor unit is an LED and random flickering is normal. Your problem is most likely caused by an electrical storm or power surge. You will need to remove the logic board from the motor unit and check for burnt or missing traces on the printed circuit board especially around the small transformer. Your holding that button in will most likely have erased the memory of the unit and all your remotes will need to be programmed once you find your problem. I really suggest you call an technician at this point.

Posted on Oct 13, 2010

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SOURCE: sears craftsman 1/2 hp garage door troubleshooting

I've got a similar problem. The green light is flashing on the unit. I can here a click when I try either the remote or wall mount switch, but no movement.

FWIW our wall switch has a lock and a light switch and I can't get the light to go on either.

The door moves freely when disconnected from the opener.

My gut tells me the logic board is fried. What I'd really like to find is some sort of trouble shooting guide - Is anyone aware of any trouble shooting information on these lifts?

Posted on Aug 24, 2008

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