Gaggia KIII-D Operating Instructions Manual page 33

Meaning of the indicator lamps on the control panel
The lamps incorporated into the control panel buttons are used to inform the user about the
function that is being performed.
As illustrated below, their meaning changes depending on whether one or more buttons are
blinking or are steadily illuminated.
Heating
Making coffee
(the blinking button is the one corresponding to
the selected control)
Machine ready to dispense steam
Error
Machine ready
Heating water to dispense steam
Cooling
Key to indicator lamps:
Lamp ON steadily
Lamp OFF
Lamp blinking