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

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Door will not go down

I have a sears door opener. The sensors have been replaced. Both light green as they are suppose to, I adjusted the sensors and they worked fine a couple of times but the only way to close the door now is to hold the wired button if you use the remote the door starts down and goes back up. Both sensor lights indicate that they are aligned. anyone who can help me would be greatly appreciated........thanks don,

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  • Anonymous Feb 20, 2009

    When I try to close my garage door, It goes down about a foot beyond the curve and then reverses back to original position. I have adjusted both the eyes. I try to arrest the door by pressing the button. I then advanced it as far down it can go and then press the button again to arrest it until the door is half way down. With the button pressed once more, the door finally closes. I , manually close and open the door most of the time.

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Use a piece of wire to bypass the sensors. if door still goes down and then reverses, you may need to adjust the torque (down pressure) for the door.

Any questions, let me know

clarkco

Posted on Feb 17, 2009

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I have a Sears garage door opener model # 139.53985DM that reverses as soon as it reaches the floor, I have checked everything but I noticed on my sensors, one is green and the other light is yellow. Is...


The sensors are okay. It sounds like your door may be traveling too far in the down direction, hitting the floor and reversing. If this is so you can adjust the 'down limit' control located on the side of the motor unit. Turn this control just a tad in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary to get it just right.

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Check the sensors again. Our unit has one amber and one green when working and if something (even a weed) breaks the optical beam it reverses and the lights blink. We've also had bright sunlight interrupt the beam. (The test for this issue is to stand such that you cast a shadow onto the sensor without being in the beam and then attempt to close the door with the remote). Next check if the door is binding during travel. If it is, check the tracks for plumb with a level and make sure the door rollers and tracks are undamaged. If a rail is crimped anywhere, it could be cause the problem. You can find some garage door sales places that sell the track sections and rollers to replace damaged parts. Check your local phone book and call around. In some cases, the door jamb may be damaged (lowering the header and shrinking the entire door area). This may require calling a professional to fix.

If the door itself is moving easily, then it sounds like the door might be hitting the floor too lightly or trying to go past the floor and triggering a safety reverse. On most of the openers, there are several adjustments you can work on to reset this. First try adjusting the down limit to above the floor and then bring it back to the floor. (However, usually these do not make the opener light blink.)

Alternatively, adjust the downward force to a higher value.

Without knowing the model of your Craftsman opener, I'll just use the directions for mine. All of these are adjusted with a flat blade screwdriver. Always test each adjustment with a complete up and down cycle.

The height limit control is on the side. (It's the forward one of two screws inside the cover - you should be able to reach them thtrough holes in the cover. Unfortunately, sometimes it's easier to get to them after removing the cover. The cover is held by 4 screws - 2 on each side.) To decrease the travel, turn the Down screw clockwise. One full turn of the screw is 2" of door travel.

The force controls are on the back with the down adjustment on the right. Turn this clockwise in 10 degree increments and test each time.

It is possible to overheat the opener with too many open and close cycles. In that case stop adjusting the unit and wait 15 minutes for it to cool.

I hope this helps.

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