The only way a motor for these units can run backwards is if the internal lead connections of the winding are reversed. On some rare occasions I have seen a failed start cap cause a motor to start in reverse but turning it off and on would fix that. If your start cap checks out OK and the motor is truly running 'backwards' you will need to replace it.
If on the other hand the flow is not going the correct way look into the valves and filter(s) for issues.
John
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