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

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Installed craftman garage door opener,door touches the bottom goes back up and stays open,have adjusted upforce and downforce many times,very little downforce when it touches the cement. Brian

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On the side of the motor unit you will find the up and down limit adjustments. You need to turn the down limit a little in the opposite direction of the arrow printed on the cover. Some tweaking and you should get it right.

Posted on Apr 04, 2011

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When I press to open the door goes up, however when closing it only goes down halfway then opens up again

The circuit that prevents door from closing when there is an obstruction is responsible. Check to make sure that the laser light by the bottom of the door is getting to the receiver on the other side of the door. Make sure there is nothing obstructing that ray. If so the door will attempt to close , then stop and return back to the top.

Aug 07, 2015 | Building Materials

1 Answer

New Sears craftman 1/2 horsepower garage door opener not staying closed, trolley is hitting bolt stop and auto reversing.Have tried to adjust the down force and the distasnce down setting to no avail?

The 'down limit' on the side of the motor housing is what needs to be adjusted. Turn this control in the opposite direction of the arrow printed on the cover. I usually adjust this so it stops short by quite a bit and then fine tune it.

Oct 15, 2011 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

When the temperature drops below 30 degrees F my garage door opener will not close the door. I tried adjusting the downforce but it still does not close. Craftsman 41A4315-7C

Put the down force adjustment back where it was as it affects the safety reversing. If the main light flashes 10 times when you try to close the door it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a bit if necessary. It could be an electronic component that is sensitive to cold and quits when the temperature drops. This is not uncommon.

Dec 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears Craftman Garage door opener model # 41a3493-1. Does it have auto reverse?

That isn't the model number you give it is the part number for the logic board. The model number is on the opposite end of the motor unit and starts with 139. If you are asking if the opener should reverse when it hits an obstacle the answer is yes. If it doesn't it is not adjusted correctly or is faulty.

Dec 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door won't stay closed

Your downforce adjustment may be set too high causing it to auto reverse when it touches down. Here is a link to a page giving different reasons why the door will not stay closed. The problems are highlighted in blue. Hope this helps.

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

1 Answer

Door reverses about 1 foot from floor.

You can overridride by pushing and hold wall button. If the door goes down and reverses up about a foot from the floor it could be a force setting issue on the opener or an issue with the door. First, pull the handle on the opener and operate the door manually a few times to make sure it opens and closes freely. You should be able to open and close the door with one hand or there is a problem with the door. If you determine that the door is ok then look at the force setting knobs. They are located on the back and have numbers from 1-10. These should be set on about 4-5 for the upforce and the downforce. I hope this helps.

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

1 Answer

Garage door opener will not close in cold weather

The are two knobs on the back of the opener. They are force settings. One is the upforce and the other is downforce. Turn both knobs to "5" and try. This should take care of the problem. They come from the factory at 1 or 2 and when it gets cold it takes a little more force to cloce the door.

Jan 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

LiftMaster Gargage door opener problem

The door obstacle detector(reversing switch) needs adjustment, or the down limit sensor needs adjusting, or one of the lift springs is loose or broken. First, remove power from the opener, pull the red door release rope, and try to lift the door up manually. You should be able to lift it all the way open with litle effort. If it opens ok, pull the door down about halfway and let go. If it is properly balanced, it should stay where you left it. If the door fails either one of these tests, it needs spring replacement or adjustment. If the door moves ok, refer to your owners manual on how to adjust the reversing switch, linit switches, and photocell sensors at the door bottom.

Jul 29, 2008 | Sears Craftsman LiftMaster Chamberlain...

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