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

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I installed a Liftmaster 3800 garage door opener, when setting the closure door will not close and the drum unspools the cable. Do I need more spring tension? Or does the door not weigh enough?

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Your best bet is to contact the manufacturer help line at 800-528-5880.

Posted on Aug 30, 2010

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This problem is best dealt with by a pro. Just because the tension on the springs is enormous and can be deadly if not done correctly or not understood. It sounds like there was too much down force and the opener tried to turn the torsion tube and it un coiled, or the opener brought the door too high past where there was tension on the spring and it uncoiled. These really are the only two things that could of happened. Please call a pro on this one. Thanks BB

Posted on Sep 04, 2010

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My liftmaster will open with the remote but to close the door, we have to hold down the wall unit. It starts to close, jerks to a stop, then we have to press and hole the button and it closes.


Hi, it is probably the safety photo beams out of alignment or not working, when this happens the garage opener goes into 'dead man' operating mode, ie you need to keep the button pressed for the door to operate. You can find user and installation manuals here - Liftmaster Garage Door Opener Installation Manuals

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I need a new garage door opener, but only have 121.5 inches from front wall to an annoying bulkhead. One installer said I needed 124 inches for a standard opener. He told me that my only solution is to...


CHECK OUT THE MODEL 3800 BY LIFTMASTER

VERY NICE UNIT - WE INSTALL THESE WITH GREAT SUCCESS

I WOULD NOT TRY TO CUT DOWN A BELT DRIVE

THE CHAIN DRIVE LIFTMASTER CAN BE CUT DOWN

HOWEVER I WOULD STILL GO WITH THE 3800 SERIES

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1 Answer

I have a LiftMaster garage door opener.When the door closes it is not completely closed on the right side. It has about a 1/4" gap at the bottom. It starts closing evenly but when it is about 2 feet...


SOUNDS LIKE YOU MAY NEED A SERVICE TECH.

IF THE CABLES ARE NOT RUNNING PROPERLY ON THE DRUMS IT WILL CAUSE THE PROBLEM YOU DESCRIBE. OR THE DOOR COULD BE CATCHING ON SOMETHING (DOOR JAB, TRIM ETC.) AS IT CLOSES.

I DON'T RECOMEND TRYING TO ADJUST THIS YOUSELF A PRO CAN DO IT IN ABOUT 10 MIN. IF YOU START MAKING ADJUSTMENT WOITHOUT KNOWING EXACTLY WHAT YOU ARE DOING YOU WILL PROBABLY JUST MAKE IT WORSE.

THE SERVICE CALL SHOULD BE $ 50.00 - $100.00

ALSO DON'T CALL A HANDYMAN ETC. ONLY A QUALIFIED DOOR REPAIR TECH.

HOPE THIS HELPS

Oct 26, 2010 | liftmaster Chamberlain Garage Door Opener...

2 Answers

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The down limit switch could be set to low. Try moving the screw clockwise to raise the stop point.

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1 Answer

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On the side of the motor unit you will find the 'down limit' control. Turn this in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary.

Nov 22, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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You can hold the smart/learn button in for 6 seconds and this erases the memory of the logic board. Then you must program your remotes and keypad.

Jun 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Overhead garage door


You have a problem with the cables. One of the cables might be broke or off the drum

Oct 08, 2008 | Sears Craftsman LiftMaster Chamberlain...

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