Thank you for your question and I understand your concern with your washer displaying "F25".
The fault code "F25" will display if the control is unable to properly detect motor speed. This fault code can display if there is a loose wire connection between the motor and the motor control or between the motor control and the machine control. It could also have a faulty tach which is part of the drive motor. Generally speaking I recommend calling a service technician with the proper tools and training to diagnose and repair your washer.
I recommend calling a Sears technician at 1-800-4MY-HOME or 1-800-469-4663 to diagnose this type of failure.