Child safety lock is enabled
Resolution
Disable the safety lock (padlock symbol)
Time: 5 min
This option prevents children from playing with the appliance while a programme operates. The programme knob and the touchpads are locked. Only the ON/OFF button is unlocked.
Usually, the Child Lock button(s) will be highlighted (padlock symbol) on the control panel. Press the highlighted button(s) for 3-5 seconds to disable the child lock.

{UM|Refer to the full description in the user manual, as the methods might differ depending on the model of the appliance}
If you have trouble removing the child lock, disconnect the appliance from the power supply for about 5-10 minutes before trying again.