F21 error on this model of Bosch washing machine pertains 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.
SOURCE: washing machine bosch maxx 7 varioperfect
Sounds like have inadvertently activated the child lock. To deselect you need to press and hold the start button for approx 5 secs or until the key light goes out. Hope this helps, please let me know if this works or if you need further assistance.l
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