Proline PROHP81 Manual page 74

Child lock
You can use this function to prevent children from playing with your dryer.
The program knob and all buttons except the button are deactivated when
the child lock function is active.
To activate this function, press and hold and
at the same time for about 3 seconds. The child lock
indicator light will illuminate.
To deactivate this function, press and hold the same buttons for about 3 seconds
again. The child lock indicator light will go out.
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