Liftmaster Wall Control Button not working after replacing gear

They have self diagnostic features and are 'smart'. Make sure there is nothing near the two door sensors and make sure they are clean. No model number given, but generic help in the link.

https://www.google.com/search?q=Liftmaster+Wall+Control+Large+White+Button+green+light+is+not+illuminated

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Locate the lock button on the wall control. Press and hold this for 3 seconds. The blinking of the light should stop and your remotes will once again work.

See if the trolley is jammed against the bolt just in front of the motor unit. If so remove the bolt and then run the opener until the door is closed. While the door is closed locate the 'up limit' control which is on the side of the motor unit. Turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Remember to replace the bolt.

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

It sounds like you have a bad wall control. You can check this out by replacing it with an inexpensive door bell button.

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

reset your remotes and your main transmitter after removing and replacing the remote batteries (these use rolling codes that change each time you operate the door) the procedure for doing this is listed on the liftmaster website

You probably have the lock enguaged. Press the lock button on the wall control for four seconds to turn lock off

• Stuck remote control button. Check all remotes. check LED on receiver.
• Staples around Multi-Function Control Panel bell wire could be cutting into that wire. Remove wires from opener and test. Replace staples causing intermittent short.
• Multi-Function Control Panel could have sticking door control push bar. Remove wires from control panel and test. Replace control panel if defective.