La Marzocco has changed the color on two of the wires on the Main Wiring Harness (Manufacturers part number: WH/4UL and WH/3UL) beginning with machine serial number B02430. Starting at the main terminal block there are three wires (red, white, and blue) that travel to the microprocessor unit. The color of both the red and blue wires has been reversed.
TB #21: Switch Harness Definition
January 30, 2001