Chamberlain Garage Door Opener Manual Error Code 42

Pull the emergency door release and check the up and down travel of the garage door for binding. It seems when closing it wants to speed up at the last bit and slam shut like it can t handle the weight of the door. I would also verify that the door is not going up slightly crooked just enough to bind perform the following tests first i would close the door and then disconnect the door from craftsman garage door opener.

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