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

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Chamberlian 2280 Whisperdrive

The power went out at my house several days agon and now my when I go to open my garage door it only raises up about 1' then goes back and forth for about 6-8 times before opening all the way. Did the power surge blow a part? Can I easily replace this?

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  • drummerboy21 Jul 28, 2008

    I have a similar problem with Craftsman model# 139.53985 garage door opener. The power went out, power came back on, opened GD with keypad, now it won't close. When you push the button on remote or wall mount console you hear one click and nothing happens. Tried resetting PIN, no luck. What can I do?

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Check the light beam safety at the door's bottom, to see if something is getting in the line of sight.

Posted on Jul 26, 2008

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I have a Craftsman 1/2 HP Garage Door Opener, Model 139.18076 or thereabouts. One day the door went up and it didn't come back down without me detaching and closing it manually. The motor hums/clicks...


Check to see if the trolley is jammed against the bolt just in front of the motor housing. If it is, loosen the chain enough to take the stress off and then run the opener until the door closes. While the door is closed locate the 'down limit' on the side of the motor unit and turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

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There isn't a reset button. Check the house circuit breaker. You may have had a power surge and that can damage the logic board printed circuit. Check the logic board for missing or burnt traces especially around the small transformer.

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Remove the cover from the motor unit and check the drive gear.

Jan 16, 2010 | Sears Craftsman LiftMaster Chamberlain...

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If the main light flashes 10 times when the door goes back up it is a door sensor problem. You chain should sag just a little. If you tighten it too much it will click as it goes over the sprocket. You can increase the down force which is an adjustment near where all those white wires go. A 1/4 turn should be enough. Release the door from the opener and operate it by hand. It should move freely and when you have the door approximately waist high it should stay put. Neither raising nor closing.

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If you can press and hold the wall button and the door will go down, you have a photo eye issue. Check the photo eyes at the bottom of the door.

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