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

Don't tighten the chain. It sounds like you have either a broken door spring or the drive gear in the motor unit is going bad. Release the opener from the door and operate it by hand. It should be easy enough to raise that your wife can do it with no problems and it should stay put when released about waist to shoulder high.

Sears Craftsman... | Answered 6 hours ago

Sounds like your drive gear is bad. It is a white nylon gear just in front of the motor. It will be obvious.

Sears Craftsman... | Answered 8 hours ago

I had the same problem. Although it appeared to be the logic board, on mine it actually was the connectors between the logic board and the power supply board.
There are 2 connections on the logic board. One white connector with wires going to the main unit, and another set of connectors that plug directly into the smaller circuit board that holds the step-down transformer (120vac - 22vac). These pins were not making good connection between the boards. I simply bent the pins slightly so they would make better contact on the logic board and have not had a problem since. This must be a weak point on these door openers. Purchasing a new logic board would work too, as the connectors are newer and tighter.

Sears Craftsman... | Answered on Oct 10, 2017

did you use the manual release to unlatch the door from the opener? You may have a problem with the door binding and opening it manually will confirm that. You may also have misaligned the sensors at the base of the door so check that too.

Sears Craftsman... | Answered on Oct 09, 2017

Check the spring above the door, mine would go up a couple of inches and we found that the spring had broke.

Sears Craftsman... | Answered on Oct 04, 2017

If motor continues to run but no chain action check for missing chain tooth or cam gear worn.

Sears Craftsman... | Answered on Sep 22, 2017

If the chain is loose I would definitely tighten it up to remove the sloppiness of the drive. That will in turn help you to accurately find the sweet spot that is currently eluding you. And you have to work fast because you do not want to overheat the motor.

Sears Craftsman... | Answered on Sep 21, 2017

Locate the smart/learn button on the rear of the motor unit near where all those white wires go. Press and immediately release this and then walk over to the keypad and key in any 4 digit code you like and press enter.

Sears Craftsman... | Answered on Jul 27, 2017

reprogram the system with the control fob as it indicates that the program is corrupted possibly from recent power fluctuations

Sears Craftsman... | Answered on Jul 21, 2017

You must have a wired keypad. To program the keypad, first unplug the garage door opener from the electrical outlet. Next, remove the nameplate from the console that the keypad plugs into and locate the program/operate switch. Flip the switch to program. Next, enter your desired four-digit PIN number into the keypad. Slide the switch back to operate and plug the garage door opener back in. The keypad should be programmed.

Sears Craftsman... | Answered on Jul 08, 2017

My garage door opener will start to close then stop and go back to the open position. If I put pressure on the door as it is closing sometimes it will close all the way and sometimes it will return to the open position. Can you help me. Thanks pbstation771@verizon.net

Sears Craftsman... | Answered on Jun 24, 2017

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