La Marzocco GS/3 Owner's Manual page 20

WARNING
THE MANUFACTURER DECLINES ANY
RESPONSIBILITY FOR ANY EVENT LEADING
TO LIABILITY SUITS WHENEVER
GROUNDING HAS NOT BEEN COMPLETED
ACCORDING TO CURRENT LOCAL, NATIONAL,
AND INTERNATIONAL REGULATIONS
AND ELECTRICAL CODES,
OR IF OTHER ELECTRICAL PARTS
HAVE BEEN CONNECTED IMPROPERLY.
Turn on power by pressing the main power switch. The
5
main power switch may be found on the left rear of the
machine.
20
Turn on power by pressing the power switch, the last
6
button on the keypad.