My Liftmaster garage door opener will not open or close. When the button is pushed, it makes a cliking/humming sound, then it clicks again and gives up. The motor does not turn. I recently replaced a gear (and lubricated it properly). It worked twice, then it opened but would not close or move.
See if the trolley is jammed against the bolt just in front of the motor unit. If so remove the bolt and then run the opener until the door is closed. While the door is closed locate the 'up limit' control which is on the side of the motor unit. Turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Remember to replace the bolt.
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