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

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Craftsman door opener will not stay down

Door goes down to floor, then reverses, tried to adjust and nothing works, have to leave the door up 1 inch. Do not have a manual.

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  • Anonymous Jan 02, 2009

    Our door also goes back up as soon as it shuts

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GOTO
http://www.garagedooropenerguide.com/installationmanuals.html
YOU CAN DOWNLOAD A FREE MANUAL FOR YOUR UNIT.

CAREFULLY FOLLOW THE ADJUSTMENT INSTRUCTIONS.

Posted on May 30, 2010

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The sensor should shut door off whrn it reaches the closed position (adjust the shut off arm!

Posted on Dec 10, 2008

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1 Answer

The door is going down within about two inches of the floor and then goes back up. It has been doing this occasionally for the past few weeks, but now it will not stay down. The light flashes 10 times each...


Anytime the light flashes 10 times when the door reverses to the open position it is a door sensor problem. Make sure the small light on each sensor is lit and not flickering. Tweak them a little. If you cannot get both lights to come on you have bad sensors.

Sep 16, 2011 | Sears Craftsman LiftMaster Chamberlain...

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

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,...


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.

Sep 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My Craftsman garage door opener opens fine. It


It could be closing too far or the sensitivity could be set too sensitive.

Lube the springs, wd-40 rust may be the whole problem.

If the door hits and the opener continues to move until the rail flexes upward and then reverses - probably the travel adjustment.

Does the door close and stay closed if you hold the wall button down constant until it closes? - this would indicate a safety eye problem.

If the door reverses before it hits the floor or just as it hits the floor it could be the sensitivity or if the safety eyes are mounted to the track they could be flexing enough to move the eyes out of alignment.

Hope this helps.


Jul 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears Craftsman 1/2 HP garage door goes all the way down, then back up. The lights do not blink. Checked for obstructions, none. Nothing blocking the sensors. What can I do to fix this?


If the door is hitting the floor and then reversing you need to adjust the 'down limit' which is on the side of the motor unit. Turn it a bit in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary.

Oct 08, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door Goes down 5 inches and then up 5 inches.


Okay here we go.

Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these is the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then give it a try.

Jul 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door opener won't close completely


look on the side of the openeer usually lekt looking at it from the rear theese are your travel adjusters one turn = 2" travel normally

Jan 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door opener


IF IT HITS THE FLOOR AND GOES BACK UP. YOU NEED TO ADJUST THE DOWN LIMIT.

IF IT GOES BACK UP BEFORE HITTING THE FLOOR YOU NEED TO ADJUST THE SENSITIVITY OR THE SAFETY EYES.

TRY THE DOOR MANUALLY AND MAKE SURE IT WORKS SMOOTHLY.

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

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