Here are some potential causes of the F06 error:

• Drive motor malfunction - The drive motor itself might be faulty and unable to maintain the desired speed.
• Tachymeter issue - The tachometer is a sensor that measures the motor's speed. If the tachometer is malfunctioning, the control board won't receive accurate speed readings and could trigger the error.
• Control board problem - The main control board that communicates with the motor and tachometer could be faulty, leading to the F06 error.
• Wiring issues - Loose or damaged wiring connections between the control board, motor, and tachometer could disrupt communication and cause the error.

Here's what you can try to troubleshoot the F06 error

• Power reset - Unplug the washer from the outlet for at least 5 minutes. This can sometimes reset the control board and clear any temporary glitches.
• Check for overloading - An overloaded washer can put strain on the motor and potentially trigger the error. Try running a smaller load and see if the issue persists.

Important to note - While the above are some potential solutions, diagnosing and fixing the F06 error often involves inspecting and potentially replacing parts like the motor, tachometer, or control board. These repairs can be complex and might require the expertise of a qualified appliance repair technician.