How do I activate the childproof lock?
To activate the childproof lock, touch and hold the E (3s) button for 3 seconds after the programme has started. When activated, the E (3s) indicator lamp will light up. To deactivate it, touch and hold the E (3s) button again until the indicator lamp turns off. (Page 39)
From the official Bosch WDU28 Washer Dryer manual, page 39
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