The main gear in the main control box plastic gear is stripped. Remove door opener main box and inspect. It can usually be ordered or rebuilt.
SOURCE: I have a craftsman garage door opener and recently
Anytime a door opens and/or closes randomly or doesn't work consistently I look for a smashed wire between the motor unit and the wall button. If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door or interfere with the remote signal. Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples. The second thing would be a bad wall button or a remote with a sticking button. Or a remote in someone
SOURCE: I need to replace my
Google "61LM". You will find it or its equivalent for sale on the internet.
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