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

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Garage door will not open!

Cold weather. I have a Overhead Garage door opener. It very old. Model 100. Going to replace the garage so I don't what to replace open yet. I get and humming noise. with the remoto or the switch. I've removed the cover. I can get it to go up and down. By moving a little white plastic piece that has a pointer in the center of it. that is connect to wires.But moving the plastic thing forward and back the door open fine. The humming noise is coming from at round black thing. Looks like a transformer. With six or seven wires running to it. What is it and is this my problem. Any Help would be help full.
Quack

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Sounds like the contactor is bad. They don't make the part for that operator any more though you could make a differant contactor work. The easiest thing to do is install a new operator. The door and the operator are seperate things. You can replace your operator now and your door later. 

Posted on Jan 31, 2009

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