Ducati ST4S Owner's Manual page 127

Water temperature indication (fig. 8)
This function indicates engine water temperature.
If temperature drops under 40°C/104°F, LO will start
flashing on the display.
If water temperature ranges between 40 °C/104 °F and
120 °C/248 °F, temperature value is displayed in fixed
mode.
If water temperature ranges between +121 °C/250 °F and
+124 °C/255 °F, HI will start flashing on the display.
E
If water temperature is +125°C /257 °F, a flashing dotted
line "---" will be displayed and EOBD light will turn on (5, fig.
6).
Note
fig. 8
If water temperature sensor is disconnected, a
dotted line "- - -" will be displayed and the EOBD light will
turn on (5, fig. 6).
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