The F6 indicates a problem with a motor drive tachometer.
This can be caused by unstable communication between the motor controller and main control board. To get to the main control board, remove the top panel. To get to the motor control, remove the rear panel. Check each connector by removing and reconnecting each one at a time. If this does not clear the error, most likely, the main control board is faulty.
The E1 indicates that the thermistor needs to be replaced. In some cases, the error occurs due to loose connections. If you have experience with washers and you have equipment at hand (volt/ohm meter), you can fix it yourself. If not, call a technician.