Remove the cover from the motor unit and I am sure you will find white sawdust inside. The drive gear is most likely stripped. It is a white nylon gear just in front of the motor. The part number is 41A2817 and is available at any good door opener service company. It will come with instructions.
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Remove the cover from the motor unit and I am sure you will find white sawdust inside. The drive gear is most likely stripped. It is a white nylon gear just in front of the motor. The part number is 41A2817 and is available at any good door opener service company. It will come with instructions.