You can secure the dryer against inadvertent changing of the set functions. To do this, activate the childproof lock after cycle start.
To Activate/Deactivate, touch Time dry and Finish in buttons at the same time for 3 seconds. In the display field, you will see the D symbol light indicating the childproof lock is active.
NOTICE: The childproof lock will remain activated until the next cycle start even after switching the machine off.
You must deactivate the childproof lock before the next cycle and, if necessary, activate it again after starting the cycle.
hope this helps its a great dryer we highly recommend it but you must do the simple cleaning procedures recommended