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

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Door wont close all the way

I have an old 1/3 hp Sears garage door opener. The only adjustment controls are opening and closing force. I think the opener is working correctly but the door does not close all the way.

Sometimes the entire door stops 1" above the floor, sometimes just one side touches the floor and the other does not. I was wondering if I need to adjust either the door or the track. If so I don't have a clue as to how to do that.

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NOT SURE WHAT UNIT YOU HAVE .
ALL OPENERS HAVE AN ADJUSTMENT TO TELL IT HOW FAR TO GO UP AND HOW FAR TO GO DOWN. LOOK ON THE SIDE OR UNDER A LIGHT COVER.IT HAS TO BE THERE SOMEWHERE

Posted on Jun 21, 2010

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What does the purple button light flashing on 1/2 horsepower craftsman garage door opener


I think the adjustment mode is on.

For example, that's from Craftsman manual:

""
Setting the Force
The force setting button is located on the left panel of the motor unit. The force setting measures the amount of force required to open and close the door.
1. Locate the purple button on the left panel of the motor unit (Figure 1).
2. Push the purple button twice to enter the opener into Force Adjustment Mode (Figure 2). The LED (Indicator Light) will flash quickly.
3. Push the remote control or control console (Figure 3). The door will travel to the DOWN (close) position.

""

Actually, you should just read carefully your garage door opener unit's manual.

Craftsman Garage Door Opener Remote

Jun 21, 2014 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a new garage door opener that has the black and purple buttons to adjust the force and travel of the door ...... eveything is working well except when the door closes it goes a little to far, the...


I have a feeling the down force adjustment is set much to high. If the door is hitting the floor hard enough to bend the rail the safety should be reversing the door to the open position. Maybe this will help.

The force adjustments control the pressure used to open and close the door. A new garage door opener from the factory is set to the lowest possible force adjustment. If you have a properly balanced door, the forces required to open and close the door should be minimal.



The force adjustments are usually located on the rear of the garage door opener and/or under one of the light lenses, If your opener has two lights. If you have lights on the side of your opener, the force adjustment will be located under the right light lens. The force adjustments are labeled with an arrow indicating open or close and numbered 1 to 9, with one being the lowest force and nine the highest. The force adjustments can only turn 260 degrees, or ¾ of a complete turn. Changes to the forces should be done in 10-degree increments. Please remember that too much force will interfere with the proper operation of the safety reversal system. Do not increase the force beyond the minimum required to close the door. Do not use the force adjustments to compensate for a sticking, binding, or unbalanced door.

Nov 11, 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...

1 Answer

My Craftsman 1/2 Hp garage door opener doesn't stop going down despite (quite forcefully!) applying pressure in the opposite direction. It would buckle (and did) if I don't let it continue unhindered...do...


YOU NEED TO ADJUST THE DOWN FORCE.

YOU WANT TO TURN IT COUNTER CLOCKWISE TO THE STOP (THIS ADJUSTMENT IS ONLY ABOUT 3/4 TURN FROM MIN. TO MAX.). THEN TRY THE DOOR IF IT REVERSES TURN IT ABOUT 1/16TH TURN CLOCKWISE. CONTINUE THIS VERY MINOR INCRAMENT ADJUSTMENT UNTIL THE DOOR CLOSES WITHOUT REVERSING. THEN GO 1/16TH TURN FURTHER.

YOU SHOULD BE ABLE TO STOP THE DOOR AND REVERSE IT BY GRABBING THE BOTTOM OF THE DOOR AS IT GOES DOWN AND LIFTING SLIGHTLY. IF YOU CAN'T GET THE DOOR TO BOTH CLOSE AND REVERSE WITH MODERATE PRESSURE YOU MAY NEED ADJUSTMENT TO THE DOOR / SPRING / ETC.
- I DO NOT RECOMMEND ADJUSTING THE DOOR YOURSELF - CALL IN A PRO FOR THAT.

IF THE ADJUSTMENT IS SUCCESFUL ADJUST THE OPEN SENSITIVITY / FORCE IN THE SAME MANNER.

HOPE THIS HELPS

Jun 28, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a new Sears 315mhz garage door opener and the door fails to reverse when an object is placed under the door


It sounds like the force adjustment may be set too high. Check this:

The force adjustments control the pressure used to open and close the door. A new garage door opener from the factory is set to the lowest possible force adjustment. If you have a properly balanced door, the forces required to open and close the door should be minimal.


The force adjustments are usually located on the rear of the garage door opener and/or under one of the light lenses, If your opener has two lights. If you have lights on the side of your opener, the force adjustment will be located under the right light lens. The force adjustments are labeled with an arrow indicating open or close and numbered 1 to 9, with one being the lowest force and nine the highest. The force adjustments can only turn 260 degrees, or ¾ of a complete turn. Changes to the forces should be done in 10-degree increments. Please remember that too much force will interfere with the proper operation of the safety reversal system. Do not increase the force beyond the minimum required to close the door. Do not use the force adjustments to compensate for a sticking, binding, or unbalanced door.



Mar 09, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door doesn't open and close properly


Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.


Jan 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door closes and then automatically opens half way


ADJUST THE DOWN LIMIT IT THINKS THERE IS AN OBSTRUCTION AND IS REVERSING LIKE IT SHOULD.

TURN THE LIMIT ABOUT 1/4 TURN AT A TIME.

HOPE THIS HELPS

Mar 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Craftsman 1/2 hp door opener


replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

Dec 16, 2007 | Sears Craftsman LiftMaster Chamberlain...

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