20 Most Recent Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+ - Page 7 Questions & Answers

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.
http://www.garagedooropeners.us/helpgifs/helppage1.html
Mike

It can be mounted to a ceiling rafter, but make sure there is room above to allow for the trolley to travel freely. If there is a clearance issue, there are top roller adapters called "quick turn brackets that make the top of the door turn faster and lower. Most likely available from your local garage door company.

For stability

Sounds like a bad motor.

Make sure that the battery in the remote is good. If it has gone bad, often the door opener has to be reprogrammed to accept the signal of the remote. Use your manual to get the directions for this procedure. And if the latter does not do it, either the remote unit is bogus or the receiver circuits on your opener are not working.

I don't trust batteries even when they are new. Try taking the battery out of the remote that is working and install it in the remote that isn't. If that doesn't work you need to purchase a new remote.

You probably have an eletrical device that is messing with frequency. Make sure that everything is off inside garage.

1. disconnect the door from the chain. 2. inspect the door again, try oiling the rollers and joints. It is the chain that lifts the door. Try manually lifting the door. If it still does not lift open, it is the door and not the Opener unit. 3. Although you don't see kinks, look for any obstructions eg. the track. 4. Make sure the track has not lossened out at any point. 5 If you can lift the door,. connect with the chain. Goog luck. Basically I think it is the door mechanism that has some how misalligned.

You probably have a stripped gear. Take the cover off the opener and the bottom will be filled with white shavings and the gear will be missing teeth. You can repair with a liftmaster gear and sprocket kit.

hope you have not held green button or your renotes will bew erased. Push green button for one second. Go to keypad. Enter 4 digit code and hit ENTER. Bulb on motor should blink. That's it.

Your manual button is bad.

No light at all on your opener? Zero none on your sensors or on your wall control? What about on the opener it self do you have lights in it? it really can only be two things I can think of. with otu seeing it One guy said check you wires. I would say tahts a great place to start I would unplug the wall control wires. Sometimes not too much with newer openers but if they got a staple in the wire it can cause a dead short. When you unplug the wire from the open it's self. Try it. If that does not work try plugging in something to the plug where the open is at. And make sure its not on a switch. Oh one last thing when you use it remote or wall control do it make any sound at all?

the door beams are not working properly. Let me know what you find

Garage door work like a wedge. As it goes down the door get closer to the jam. So if you moove the weather stips closer to the door that probebly solve your problem. Do that whith the door complitely close.

Good day Paul

1.Check to see if the door is running correctly. 
  A. Run the door down and pull the emergency release. See if the door will run easily by itself.
    1. If it runs hard by hand try lubricating the rollers and hinges with silicone spray or some form of               lubricant (not WD 40)
    2. If the door is heavy and falls back to the ground, you probably have a spring issue (either broken           or needs more tension) in this case call a professional door repair company in your area.
  B. If the door runs fine then check the up force on your operator (the box that hangs from the ceiling          and reads Craftsman). If the light(s) on your operator go from front and/or back, the force                      adjustment screw is on the back of the operator. If the lights are on the sides of the operator then          the force adjustment screw is on the right side (looking from the back of the operator and facing            the garage door). Turn the light blue adjustment screw with the up arrow to a higher number.

Check out this site.

http://www.retro-remotes.com/apps/webstore/products/category/365891

Press the learn button on the garage door opener once then press and release the garage door opener remote button.

I think your neighbor has a problem. Not you.

I am not sure what you are talking about. Do you mean the intruder alert? Intruder alert: The light bulb on the garage door opener motor comes on when the inferred safety beam in broken for a specified amount of time.

Caution: do not use LED bulbs with garage door openers. They are a possible source of signal interference between the transmitter and receiver on the opener.