"Press the push bar to activate control" message on Chamberlain or LiftMaster wall control panel
I disconnected the wall control panel and waited for five minutes before reconnecting it, and then it seemed to work.
Also, it is said that one might have to press the button &quot;up to 4 times to see if it syncs back up&quot;.
A Chamberlain rep wrote me that also &quot;Sometimes, depending on the unit you have, disconnecting the motor doesn't allow the wall control panel to fully shut down to try and sync it back the garage door motor unit. If the issue happens again and you have no had a power outage I would recommend to try replacing the wires the panel is connected to in case there is a short.&quot;
Finally, see also this post.

It was a known issue last year. They fixed it with the current ones.
All the controls out of the box should be good and if you have
individual wall controls the green sticker is bad and the blue sticker
is good.

For what it's worth, mine has no colored sticker.