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

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Craftsman garage door opener

My door won't go up or down. When I hit the botton the belt starts going but looks frayed in some spots (wire is showing). I seems like it doesn't catch.

vicki

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IF THE BELT IS MOVING - THE DOOR HAS BEEN RELEASED FROM THE TROLLEY.

PULL THE RED ROPE AND MAKE SURE IT LOCKS ONTO THE INNER TROLLEY.

Posted on Jun 05, 2010

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The garage door will open with a single press of the button but will not close the same way. It will start to close - then reverse - unless I hold the botton down for the entire closing motion.


Check the door sensors. They must be pointed at one another and the small light on each one must be lit and not flickering. Tweak them if necessary. If you cannot get both lights to come on you have either bad sensors or the wiring to them.

Nov 27, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door had a stripped gear so I


if the stops are not wrong.
they tell it how far to go up and down.

then I think the safety sensor is misaligned.
make sure the light on one side is pointed at the receiver on the other. maybe it is dirty or blocked.

good luck!

Jan 10, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Sears craftsmen belt drive opens but doesn't close properly. It will travel a foot to three feet and then reverse. If the door is disengaged, and in the up position, the belt will do the same thing. If the...


Is the belt or part of the opener hitting on the door as it trys to go down? Since if the door is down the opener goes all the way down, it seems that it might be hitting / binding on the door somewhere and then reverses.

Dec 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My Liftmaster garage opener won't go up, only down. It's not bound mechanically. I just replaced the shaft assembly because the old one broke. But since I've done that the garage only goes down, it won't...


BE SURE YOU HAVE THE CHAIN/BELT INSTALLED PROPERLY.
IF THE DRIVE IS AT OR NEAR THE UP LIMIT SWITCH THE DOOR CAN'T GO UP.
LOOSEN & REMOVE THE CHAIN/BELT.
TRY RUNNING THE OPENER TO BOTH LIMITS - JUST TO SEE IF IT WORKS.
RUN THE OPENER TO THE DOWN LIMIT.
MOVE THE TROLLEY TO THE CLOSED POSITION - RECONNECT CHAIN/BELT.
HOPE THIS HELPS

Mar 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door will not close at the bottom


could be the safety "eyes" as suggested (based on the "does not go back down"), but there are also 2 adjustments on the opener. One is to tell it where the floor is, and the other is to tell it how much pressure to reverse at. I would try adjusting the "floor". Since it's hitting the floor and coming back up, that's probably your problem.

Dec 27, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Red supmart button


The safety interlock sensor is blocked or not working - those are the sensors at the bottom of the door that check for blockages.

Jul 21, 2008 | Sears Craftsman LiftMaster Chamberlain...

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