3.4.1 Operation
The ground coffee is measured into the espresso group and then the group closes. Hot water is forced
at high pressure through the layer of coffee. The complete espresso cycle is described and illustrated
below. This also explains the function of the position switches 1 & 2 (see Section 3.4.3) located in the
drive unit.
Position Action Switch position 2 1
I Start / ll
Idle position of the espresso group. Ground coffee is
measured into the brewer chamber
0 0
II Compact
The espresso group moves to the brew position.
The upper piston compacts the ground coffee.
0 1
III Brew
A very small quantity of low pressure hot water is
added to the coffee pellet (pre-infusion). Then the
pump starts and pumps hot water at a pressure of 10
bar through the compacted coffee.
1 1
IV Eject
The espresso group moves back to the start position
and ejects the coffee residue.
0 1
Error E24
If the switch position shown here occurs, an error
E24 brewer error occurs
1 0
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