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Recent LiftMaster 3840-related questions: Where Can I Find Complete Technical Info For A Liftmaster 3840 Garage Door OpeneNeed to know Logic Board jumper settings and communications protocol for remote devices. Door Will Not Close!
When I press the button to close door, it goes down a couple inches and then reverses and goes back ... Will A 485 Lm Battery For A Model 3850 Work On A Model 3840?
I need a new battery for my garage opener, model 3840. All of the batteries I have seen are 485LM fo...