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How do I fix an F25 (Watchdog Fault) code for a 9000X Series drive?

This is a fault of the microprocessor. First thing to do is try to reset the trip. If this is the first time it has happened, resetting it may work as it could have just been a voltage disturbance or the micro was overloaded for some reason. You should check the load on the microprocessor with the drive running and any communications working to see if it is possible the load is too high. We would consider anything in the 90 percentile to be of concern. If the micro is not being overloaded and if the trip has been repeated replace the control board.