SOURCE: Liftmaster Garage Door Opener Problems...
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!
SOURCE: Chamberlain Liftmaster Professional 1/2 HP
Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.
SOURCE: I NEED TO PROGRAM MY LIFTMASTER GARAGE DOOR
If you have the correct remotes for your opener you can program them like this:
Locate the smart/learn button on the back of the motor unit. Press and hold the button on your remote while you press and immediately release the smart/learn button. Do this for each remote.
SOURCE: I have a liftmaster security+ garage door opener.
If the instructions for programming your car remote has you using your original remote and the original remote has quit you will need to purchase a new Liftmaster remote.
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