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

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When closing my garage door, the door reaches bottom and immediately reverses upward. Unfortunately, I don't have a manual...

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If the door hits the floor, pauses for a couple of seconds and then reverses to the open position it is because it is traveling too far in the down direction. Locate the 'down limit' control on the side of the motor unit and turn this control in the opposite direction of the arrow printed on the cover. Some tweaking will be necessary.

Posted on Oct 12, 2010

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1 Answer

Garage door closes but doesn't stay closed


if nothing is obstructing the door then there are 2 possibilities:
a) your limit switch for closing is too low and the closer detects the motor stall as the floor is reached, then opens in case it's a kid under the door.
b) your tracks and garage door are mis-aligned, causing excessive force to trigger the reversal. Make sure the door closes easily by hand.

Jun 19, 2015 | Genie Powerlift 900 Garage Door Opener

Tip

How to safety check your garage door opener


Place a 2x4 (or other object that is solid and about 2" thick)flat on the ground in the middle of the door. Activate the opener and lower the door until it makes contact with the 2x4. It should hit the 2x4 and then reverse in the upward direction. It can put pressure on the 2x4 just not stay there. If it reverses then it has passed. If it stays down then find the down force adjustment on the opener and turn it down. This adjustment can be found in your manual and will differ in location from brand to brand of garage door opener. Check the belt/chain for slack when it is running(there is no need to check this on a worm drive opener). If there is more than 3/4" slack then tighten it up with the tension adjuster on the trolley. Check the force adjustments per the manual as well. Do not pay attention to this slack when the door is shut as the trolley arm presses on the opener arm to gain the best seal at the bottom of the door. If you have a screw drive you can lubricate the screw with liquid graphite. All other types need none unless you want to lubricate the nylon gear inside the unit with rail grease, but be careful here and unplug the unit first. If your garage door opener has safety eyes start the door down and then cross the beam. The opener should reverse upward. If it does it passes, if not then call a reputable repair firm. Thanks BB

on Sep 03, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Why is my garage door suddenly reversing when going down?


Deb, that reversal is a child safety device - if the bottom edge of the door detects contact with any object, it'll immediately reverse so it doesn't kill a child. Or a cat, dog, whatever.

The opener mechanism should have a stop switch that prevents the door from closing hard against the floor - that stop switch needs to be adjusted so that the door will stop JUST before hard contact. That'll take care of it "bouncing" off the floor & reversing. As to it reversing before it touches the floor... examine both guide rails closely to see if there's any obstruction that the door's bottom edge may be contacting to trigger the child protection reversal switch.

Aug 04, 2014 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster 1265 closes and then immediately opens garage door. Pulling chain release does not release chain. Only way to keep door closed is power shut-off; performing very rapid return when reaches...


There are two possibilities here. First is if the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure the sensors are pointed at one another and the small light on each one is lit and not flickering. Tweak them a little. If you cannot get both lights to come on you have bad sensors.

Second is if the door is reversing when it hits the floor. This is a problem with the door traveling too far in the down direction. Locate the 'down limit' located on the side of the motor unit and turn it a bit in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary.

To release the door with the rope - pull straight down and then pull the rope in the direction away from the door. This should lock the mechanism in the open position. To release this pull straight down and release.

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

1 Answer

Lift master door will not close with remotes. to close door, the main switch in garage has to be held down until door reaches bottom. when using either remote or main switch, to close said door, the...


Anytime the main light flashes 10 times and 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 bit. Check the wiring for breaks or shorts. Nothing else will cause this problem.

Dec 14, 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

Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+: Door goes down and when it reaches the bottom, it ...


If the door hits the garage floor and then reverses to the open position you need to adjust the 'down limit' which is on the side of the motor unit. Turn this control in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary.

May 16, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door opens after closing


If the main light flashes 10 times when the door reverses it is a door sensor problem but if the door is hitting the floor and reversing and the main light is not flashing then the door is closing too far and the safety thinks it has hit something. On the side of the motor unit you will find 2 controls. One of these is the 'down limit'. Turn this in the opposite direction of the arrow printed on the cover until the door closes but does not reverse.

Jul 17, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Craftsman door opener will not stay down


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

Dec 10, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener problem


If the safety eyes are not connected you need to ho;d the button down until it reaches the close linit.

Feb 19, 2008 | Sears Craftsman LiftMaster Chamberlain...

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