The F6 error code means that the computer on the control didnt detect that the motor reached a high speed on the spin cycle, sometimes it thinks the washer didnt spin fast enough because of a loose wire connection either on the motor or the control boards (motor &machine control) if you find that the washer did actually spin at high speed (clothes dont come out sopping wet at the end of cycle) the wire connections or the motor control board will be the potential causes of the F6 error code.