Active Child Lock:
Choosing a program and then press button "Temp.“ and "Speed" for 3 seconds simultaneously to block all panel elements against activation, panel display icon

De-Active Child Lock:
For unlocking please press again above two buttons.
Note:
The child lock indicator lights up when the child lock works.
Feature is optional when the machine is running.
If a button is pressed.The display shows:

When the child lock is activated, The change is not running.