Are there reset button on the motor

1. Turn off the machine (dial to 0)
2. Open the door
3. Turn on the machine on first program
4. Close the door
5. Turn off the machine
6. Turn on the machine on the "six-o-clock" program, which is centrifuge
7. Press the "option down" button and keep it pressed (This is the button left of the display)
8. Turn the dial to "seven-o-clock" (empty/pump out program)
9. Release the "option down" button
10. Turn of the machine

Hi

F21 error in your Bosch washer relates to a motor or a control board fault. This can be reset and to reset it turn the appliance knob to the off or reset position (12 o'clock), turn the knob to the 6 o'clock and then press and hold the spin button, then while holding that button turn the knob to 7 o'clock position, continue holding spin button for 15 seconds and then turn the knob to off. After a minute turn it back on, if the error code is still there then it means that the motor or brushes in the motor should be replaced, though it is always better to replace the motor assembly completely. Hope this helps...please post back for further assistance.

Daniel