It almost certainly means your machine is locked. (key . . . lock, get it?) On American machines you lock it by pressing a button for more than 2-3 seconds. You do it to keep your kids from messing around with the cycle once it is started. Probably someone did it accidentally. I'd try pushing each button like that and see if you can unlock it that way.
If you have the owners manual it usually have a section in the manual explaining what the codes mean. If you don't have the manual you could contract the Bosch customer service dept. Or, contact one of Bosch's suppliers.Or, try www.justanswer.com
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