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I have a BOSCH Classixx6 1400 Express, F21 what does this mean please?

F21 showing on my BOSCH CLASSIXX 6 1400 Express. WAE28363GB
Is there something I can do to rectify this fault please.
Thank you
Regards
Rich
Rich, October 2016
link Click here to see other fixes for Bosch Classixx.