"F6" is a Motor Speed error problem. It is commonly attributed to a broken or slipped drive belt, defective Drive Motor, or bad Motor Control Unit (MCU). The following link explains:
http://www.fixya.com/support/r3608706-f06_error_codeFirst, remove the back panel of the unit and make sure the drive belt is not broken, or has not slipped off the drum pulley.
Then, remove the top panel of the washer and check all the connector plugs between the Drive Motor, MCU and Central Control Unit (CCU). Check for loose connections and then unplug each connector and plug them back in (one at a time) to ensure they are snug and making good contact. The top panel comes off by removing the three screws that hold it in place in the rear of the washer. With the screws removed, the panel will slide back, then off.
NOTE: You only need to check the connectors that affect the drive motor and MCU circuitry.
The MCU has a tachometer mounted on it. If it is determined to be the cause of the problem, it is considered part of the MCU and cannot be replaced separately. The MCU is not serviceable and will require replacement.
Next, check the motor windings to ensure they are reading the proper resistance. Followed by continuity checks of all the interconnecting wiring between the drive motor, MCU and CCU. You should not need a service manual because each one of these washers comes with a technical data sheet.
For more in depth troubleshooting tips refer to your tech sheet located inside the washer behind the lower toe panel. You will need to locate and remove the screws under the bottom front edge of the toe panel. Once removed, the panel will drop down, then come off. If the tech sheet isn't located directly behind the panel, it will be affixed to one of the interior cabinet walls. The tech sheet includes all error codes, test points, diagnostic procedures and helpful illustrations to assist in troubleshooting and repair of your washer.
If you have questions, or require additional assistance, please let me know. I hope you find this information helpful.