Kenmore/Whirlpool washer error code F06 is a communications error and usually results in the CCU control board being replaced.
I have seen some of these f06 error codes caused by loose wire connections on either of the motherboards (the CCU or the MCU). Make sure the ribbon cable has a secure connection between both of the controls. Try unplugging the wires harness on the CCU and you could possible reset the board. Several technicians have reported success with plugging the unplugging and plugging the wires back in.
Check your use and care manual as some of these units had a five year warranty on certain electronics parts. If you are going to repair this unit yourself look at our front load washer break down video to access the control board.