Miele KMDA 7774 Operating And Installation Instructions page 42

Safety features
Activating the safety lock
 Touch and hold the  and
 sensors at the same time for
6 seconds.
The time counts down in the timer
display.  will appear once the time
has elapsed. The safety lock is
activated.
Deactivating the safety lock
 Touch and hold the  and
 sensors at the same time for
6 seconds.
 will appear briefly in the timer
display and then the time will count
down. Once the time has elapsed, the
safety lock is deactivated.
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