HP ProLiant ML370 - Hot-Plug Fan Leds

LED Indicators and Switches
Hot-Plug Fan LEDs
Each hot-plug fan contains a dual-color LED.
Figure 4-6: Hot-plug fan LED
The hot-plug fan LED indicates the following conditions:
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Green = The fan is operating normally.
Amber = The fan has failed.
Off = The fan is not powered or is not seated.
4-8 HP ProLiant ML370 Generation 3 Server Maintenance and Service Guide