I have not experienced this but did a search and found that it could be a voltage problem. make sure to check the voltage at the plug. below is a quote from one of the only posts i found with a cure. this is in line with jmarine's suggestion.
"make sure your trollin motor is getting sufficient power from the battery, mine did the same exact thing yesterday and it turned out i had a dead battery and the motor wasnt receiving 36volts but the remote did flash F"
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