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F then 51 flashes when there is a motor rotor position sensor (RPS) failure.
you need to replace the RPS, here a link to the part and a video on how to replace this,
http://www.repairclinic.com/PartDetail/Rotor-Position-Sensor/W10183157/1394136?modelNumber=WTW6600SW0#repairHelpVideoTabs this will fix the issue, hope this helps, thanks Bryan