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

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Chamberlin garage door opens to top limit bounces back to return down about 6 inches and then returns to open limit. What adjustments are neccessary?

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The limit switch of both the sides are not reached. The drive must be realigned to work till the door closes fully so as to touch the limit swittch to switch off.
Similarily the open door must go to the extreme point to cut off with the activation of the limit switch.

Posted on Sep 11, 2010

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Door comes down and goes right back up. then the lite blinks 4 times with a click noise. the safety eyes also are not on


It sounds like you need to adjust your down limit switch and/or perhaps your motor force settings. If the limit switch is not in the sweet spot along the rail it can be triggering too soon or not in time. In your case it could be too far down the rail and thus not stopping/slowing the motor in time. Your door is then being pushed against the floor too hard. Your safety/return force is goes way over limit and tells the opener to go back. While closing your door look at your rail and if its bending when the door hits the ground, this is definitely happening. After finding the sweet spot for your down limit switch, you can readjust your return/safety force per your opener manual.

Jan 03, 2011 | Chamberlain 12HP Power Drive Chain Drive...

1 Answer

No matter when i adjust the force the door goes down, stops briefely, them returns to open position. can't get force adjust to let it stay down.


If the door is hitting the floor and then reversing it is traveling too far in the down direction. Locate the 'down limit' on the side of the motor unit and turn it in the opposite direction of the arrow printed on the cover. Some tweaking of this control will be necessary to get the travel just right. The force adjustment affects the safety of your opener. Try to put it back where it was.

Sep 30, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door bounces back open


It sounds like your door is traveling too far in the down direction. Locate the 'down limit' control on the side of the motor unit and turn this control in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary.

May 13, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door bounces back open


It sounds like the door is traveling too far in the down direction. Locate the 'down limit' adjustment on the side of the motor unit and turn it in the opposite direction of the arrow printed on the cover. Some tweaking of this control will probably be necessary.

Mar 21, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chamberlin Series 1100 Garage Door Opener will not move over 1 Ft


replaced gears on my neighbors and had same problem< took cover off of limit switches and found a switch had a bent arm. straightened it and all worked good.

Dec 31, 2009 | Chamberlain Powerdrive PD422D 1/2 HP...

1 Answer

I have to hold the button on my garage door down it will go down but then returns


HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
WHEN HOLDING IT DOWN MAKES THE DOOR CLOSE PROPERLY THE PROBLEM IS IN THE SAFETY EYES.

ARE BOTH LEDS ON? - CHECK FOR A LOOSE OR BROKEN WIRE.
ARE THE EYES WIRED CORRECTLY?
ARE THEY AIMED AT EACH OTHER?

THE BOUNCING OFF THE FLOOR IS A DIFFERENT ISSUE - ADJUST THE CLOSE LIMIT JUST SLIGHTLY.

Jun 05, 2009 | Chamberlain Powerdrive PD422D 1/2 HP...

1 Answer

I have a gargae door that goes down only not up. Plus when it goes down it stops at the bottom and retrives 6 inches back up.


Check to make sure that the garage door is balanced. Sounds like the springs need to be adjusted and the travel limits need to be reset.

Dec 30, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door opener moves foward about 10 inches then returns


UNPLUG THE UNIT FOR ABOUT 5 MIN. TO RESET TRY TO OPERATE IF IT STILL MOVES 6-8 INCHES AND FLASHES 5 TIMES THE RPM SENSOR IS YOUR PROBLEM - COULD JUST BE THE CUP HAS MOVED ON THE SHAFT. IF IT IS IN PLACE AND STILL NOT WORKING REPLACE THE PICKUP.

Dec 11, 2008 | Sears Craftsman LiftMaster Chamberlain...

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