Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
When I try to close the door either by wall the unit in the garage or the remote in the car. The door goes down about a foot passed the curve and then reverses to it original open position. I have adjusted the eyes but the problem persists. I have hit the button to arrest the door and then to advance it until it is half closed. When I press the button once again, the door will continue it's downward trend until it is fully closed or it will reverse back to fully open position.
I would appreciate any advice to remedy the problem.
SOUNDS LIKE A SENSITIVITY ISSUE UNHOOK THE DOOR AND TRY IT MANUALLY TO BE SURE IT DOESN'T BIND OR IS TOO HARD TO OPEN OR CLOSE.
IF ALL IS WELL CHECK THE SENSITIVITY SETTINGS ON THE BACK OR SIDE OF THE OPENER.
YOU WANT THIS SET AS LOW AS POSSIBLE AND STILL OPERATE THE DOOR WITHOUT REVERSING.
NOTE: THE FULL RANGE OF ADJUSTMENT IS ONLY ABOUT 3/4 TURN SO MAKE A VERY SLIGHT ADJUSTMENT AND THEN TRY IT AGAIN.
HOPE THIS HELPS
Posted on May 28, 2010
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Posted on Jan 02, 2017
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Oct 16, 2014 | Building Materials
If when closing the door it reverses to the open position and the main light flashes 10 times it is a door sensor problem. Make sure the small light on each sensor is on and not flickering ever so slightly. (check closely) Tweak them a little even though they may seem to be okay. Check for 5vdc between terminals 2 and 3 on the rear of the motor unit. If there is no voltage or if it is greater than 6vdc the logic board is bad.
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