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On your LiftMaster garage door opener, Craftsman garage door, or Chamberlain garage door opener, take a look at the back of the motor housing and locate theIf your door opener is brand new, the remote won't work until you program it. Follow the procedure in your owner's manual for doing this. When a remote stops If your door opener is not working, the first thing you should check is the power plug to ensure that it is plugged in all the way and transmitting power to the Garage Door Opener Lights Flash, but Door Doesn't Close · Check that the lock button on the main door control isn't activated. · If the lock button isn't