There are different parts that might became bad and cause your problem like relay contact, starting capacitor, running capacitor. However all these parts are included in one unit the PCB printed circuit board or electronic board? So you need to replace this parts in attached link is also called RMM.
We have here below a link with service manual for the fan at which on the bottom you will find the parts diagram and parts list. You should try to confirm the part code for your model with Casablanca service department before confirmation of order.
Also please note that you will need a little experience with electronics before proceeding with above operation.
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