Hi, welcome to Just answer .... F21 is a motor circuit fault, if the reset wont work then you have to replace the motor or the control... please follow this for reset:
Turn the knob to the off position.
Turn the knob to the 6 o'clock position.
Wait till the start light flashes.
Press and hold the spin button.
While holding it, turn the knob to the 7 o'clock position.
Release the spin button.
Turn the knob to off.
Turn on and try the machine again.
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OK please provide with its complete model number and PNC number
Sorry I was away... thanks for the information, in your model# ***** is the Spin speed that you have to press and hold