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I am not a HVAC pro, but when I've had this problem with my heatpumps in the past it was due to a bad motor control module on the blower fan motor.
It happened so often with my Carrier 4-ton hp that I learned how to change it myself and kept a spare module on hand (the last one cost me $375).
It could be something else of course, but you need a pro to check it out (as I usually do) if you do not know how to service your unit.
Good Luck!
Mike
 
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