The pre infusion setting can be adjusted for three different levels: no pre infusion, 1 second, or 2 seconds.
Depending on your desired taste, and the type of beans you are using, you can adjust the pre-infusion setting by following the steps below:
Press and hold simultaneously the X1, X2, and temperature button for 3 seconds.
Turn the beverage selector dial to "espresso".
Press the temperature button until the light corresponding to the pre infusion setting you want is illuminated:
lower light = no pre infusion
middle light = 1 second pre infusion
upper light = 2 second pre infusion
Press the OK button to save the change.