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Fault F21?

I read where one turns the dial to 6 `oclock then pushes the RPM button and clicks back one click and then release the RPM button. Where is the the RPM button? I can1t see one on my machine
Richard, November 2013
The RPM button is the spin speed button. Cheers

Kenjo, November 2013
what model?.what is happening or not as the case may be?.there are some f21 codes on Bosch relating to motor in which case check the brushes if fitted

CK, November 2013