It’s been a long day. You pull up in front of your garage, press the open button on the remote, and you wait for the door to open. And then you wait some more. You press the button again, but still nothing happens. You realize that there’s something wrong, but it can’t be the remote, as you just changed the batteries. You realize with a sinking heart that you’re going to have to reprogram your LiftMaster/Chamberlain garage door opener.