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Hello, the printed circuit board that controls the fan is most likely bad, it is a complex electronics diagnosis. Most techs will replace that board, and if that fails they will replace the main control board in the outside unit...... if... they can find the parts. This is not a do it yourself type project.
Let me know which direction you are from the center of the nearest city if you wish and I will see if I can locate any reliable company that has or can get parts for that system.