The Power went off and than switched on again (in apartment) and the Washing Machine (Bosch Exxcel 1200) is beeping and shows code 0 and the sign "key".
I had the same problem. All it means is that the child lock has been activated. To deactivate it simply hold in the start button for about 10 seconds and this will make the key disappear and you can then do your wash.
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