To access the descaling function, enter the 

 until the display shows the dedicated icon. 

 to enable the function (On) and confirm using the 

To cancel the descaling cycle, press the START/STOP button for at least 3 seconds.  

 indicated by the progressive emptying of the progress bar and by the indicators on the display:

Once the descaling cycle starts, it can only be stopped before the container filling cycle with descaler solution ends. Afterwards, the appliance will not allow you to run any other function until the descaling process has finished. The entire duration of the cycle is approximately 40 minutes.

Descaling function

Descaling function