The F25 indicates a motor tachometer issue. Remove the front access panel and the top cover and (not in all models) the rear panel. Make sure you have unplugged the machine. Check the pins in the connector to ensure they are not bent, broken or rust. Do this to each connector separately. Then test the washer again. If the problem persists, check the motor with an ohm meter.
Unplug the washer and get to the wire harness. Disconnect the motor and check the following pins:
- Pin 1 to 3 (6 ohms)
- Pin 1 to2 6 (ohms)
- Pin 2 to 3 6 (ohms)
- Pin 4 to5 115 (ohms)
If the readings coincide with the above, the motor is all right.