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When you removed the motor, did you take it apart? Did you test the motor with a 9V battery? These small motors seldom fail. Replacements can be had in any bone yard, one damper motor fits them all.
Be careful with the motor positioning. The sensors inside the black box must be in the exact position as when the motor is removed from the damper; The ECC unit knows the range of motion and stores that information for life.
Did anything get into the air stream that could block the damper?
How did you decide that the recirc damper was the problem?
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