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

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I have Craftsman ½ HP Garage Door Opener Model 139.18458D. It reopens immediately after closing. Sometimes it works normally, and sometimes gives this problem. I have tried adjusting the close force, but nothing happened.

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It sounds like the door is traveling too far in the down direction. When it hits the floor the safety causes it to reverse to the open position. You need to adjust the 'down limit' not the force.

Posted on Sep 07, 2010

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Posted on Jan 02, 2017

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My sears Craftsman 1/2 HP garage opener starts and quickly stops with a ****. sometimes only moving the door a inch or so. Lights on opener flash once, somethings power completely seems to go off... power...


Make sure all the connections are tight on the rear of the motor housing. The terminals where all those white wires go must be tight. Also make sure the plug into the wall is snug and not sloppy.

Jul 19, 2012 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Have a Craftsman 1/2 HP Garage Door Opener, been working fine. Now when you start it you hear the motor running as normal but the chain doesnt move?


You must ensure the drive chain is engaged to the door puller.
Sometimes the emergency release if pulled (red cord) the drive and the coupling come separated.
Make sure the pin is back in place (pull release cord and make sure pin springs back in).
The run an open close cycle, it should pick up the drive again.


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Many thanks

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Feb 22, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftman garage door opener closes via the key pad and immediately reverses and reopens. have adjusted travel limit as well as force. Any suggestions


If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a little. If you cannot get both lights to come on you have bad sensors or the wiring to them.

Oct 12, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener is malfunctioning


It sounds like the gear and sprocket assembly has gone bad. This would cause the symptoms you have.

Sep 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener


You need to do is shade the eyes some how for th door to work. What I did was remove them and put them up by the opener so the sun does not get to them.

Mar 09, 2009 | Sears Craftsman LiftMaster Chamberlain...

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Garage door opening/closing problem


Could be a bad wall button or a smashed wire.
Anytime a door opens and/or closes by itself, or remotes work intermitantly I look for a smashed wire between the motor unit and the wall button or a bad wall button.

If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door or interfere with the remote.

Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.

The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone’s purse that gets the button pushed by other stuff in the purse.

The test is to disconnect the push button wires at the power unit. If the self operation / interference stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button.

HOPE THIS HELPS

Jan 27, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door wont close all the way


NOT SURE WHAT UNIT YOU HAVE .
ALL OPENERS HAVE AN ADJUSTMENT TO TELL IT HOW FAR TO GO UP AND HOW FAR TO GO DOWN. LOOK ON THE SIDE OR UNDER A LIGHT COVER.IT HAS TO BE THERE SOMEWHERE

Nov 22, 2008 | Sears Craftsman LiftMaster Chamberlain...

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