Volvo Penta D4 Operator's Manual page 27

Instruments
Coolant level (orange indication)
The coolant lamp lights up when the coolant level is
too low.
Check coolant level. Please refer to "Maintenan-
ce: Fresh water system".
Red warning indication, serious fault
If the red warning indication is shown during opera-
tion, a serious fault has occured.
Please refer to the "In case of emergency" chapter,
and you will find detailed information about recom-
mended action in the "Diagnostic function" section.
Orange alarm indication, fault
If the orange alarm indication is shown during opera-
tion, a fault has occured.
Please refer to the "In case of emergency" chapter,
and you will find detailed information about recom-
mended action in the "Diagnostic function" section.
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