Sterling Power Products DAI-1500C-24xx - Manual (Page 21)

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F.1 Diagram of the different mode
Indicates an off LED Indicates a orange blinking LED Indicates a lit green LED
All the functions are enabled. This is factory setting.
The inverter ins disabled. Only the Bypass switch and charger will
work normally.
Charger and Bypass switch are disabled. The inverter will work
continuously even if there is a correct AC voltage at the input.
Inverter and charger are both disabled. Only the Bypass switch
function is enabled in input and frequency is OK.