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Recent LiftMaster LM21XPBB-related questions: Error Code 42. How To Clear.My Lift Master 8550-267 door control display has an error code 42.Read out is: "EXCESSIVE OPENING FO... Error Code 15, Motor Control.
The belt will move 1/4 in then stops.Check he sensors etc. The up/down arrows keeps flashing on the ... Battery Was 9 Years Old, I Replaced But Continued To Beep. What Could That Be?
replaced 9 year old battery but continues to beep