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

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Liftmaster Garage Door Opener Problems...

When I press either the wall button or my wireless remote the garage door lifts up probably 2 feet, then goes back down.

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The problem lies in the RPM sensor, most likely due to the interrupter cup assembly. The interrupter cup assembly is the black cap that runs through the RPM sensor. You may have forgotten to re-attach this piece or it is probably moving too far out when the garage sets in motion. To fix this, remove the cup assembly, unscrew the two screws on the top metal piece with a 1/8 allen wrench, push the metal piece as far in as possible and put the screws back on. This will give more room for the cup assembly to spin and be read by the RPM sensor. Hope this helps!

Posted on Jul 10, 2008

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Posted on Jan 02, 2017

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How to change code on the garage door opener and the remote control on a lift master garage door opener


If you have a 315MHZ LiftMaster Garage door opener do the following:
Follow the purple wire (Antenna) up and you will see a square purple button.
Press and hold the square purple button for ten seconds until the amber led goes out.
Press and release the purple button one time (The amber led will come on solid).
Press and hold the button on the garage door opener remote control for two seconds (The light bulb on the garage door opener will blink and you will hear a click sound the amber led will go off).
to program the wireless keypad do the following:
Press and release the purple button one time (The amber led will come on solid).
Enter a four digit code into the keypad then press and hold the enter button for two seconds (The light bulb on the garage door opener will blink and you will hear a click sound the amber led will go off).

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Push buttons on remotes won't raise/close lift master mod 81lm


Check to see if the light in the wall control is flashing. If it is press and hold the lock button for 3 seconds.

Jun 13, 2012 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

It's not a remote part that I replaced it's the plastic gear of the garage door on the ceiling of my garage. Now it does not work. Only goes up and down 2 feet when I press the wall button in my gara




Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

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1 Answer

My liftmaster will open with the remote but to close the door, we have to hold down the wall unit. It starts to close, jerks to a stop, then we have to press and hole the button and it closes.


Hi, it is probably the safety photo beams out of alignment or not working, when this happens the garage opener goes into 'dead man' operating mode, ie you need to keep the button pressed for the door to operate. You can find user and installation manuals here - Liftmaster Garage Door Opener Installation Manuals

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Make sure the light in the wall control is not blinking. If it is press and hold the lock button on the wall control for 3 seconds.

Feb 11, 2011 | Sears Craftsman LiftMaster Chamberlain...

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Press and hold for 3 seconds the button on the wall control with the lock icon. There you go.

Nov 21, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have 2 liftmaster 3245. The hand held remotes were working fine then stopped. I replaced the batteries and turned of all electrical/RIF close by. Still not working. Both cars operate the doors with no...


You need to reprogram the remotes by briefly pushing the learn button on the garage door opener until it flashes once, then release the button on the garage door opener.

Now press the remote button once until you hear the garage door opener click, now press the remote button once again and the remote should be programmed to work for that garage door opener.

DO NOT press and hold the garage door opener learn button for more than 10 seconds or you'll erase all programs and have to relearn all the remotes, including your car ones.

Hope you found this very helpful and best regards.

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