Lenovo NeXtScale n1200 Installation And Service Manual page 26

Figure 9. Fan power control with call outs
Fan power control indicators, controls, and connectors:
The fan power control has LEDs, controls, and connectors that you can use to
obtain status information and restart the fan power control.
Figure 10. Fan power control with call outs for the LEDs, controls, and connectors
The fan power control has the following LEDs, controls, and connectors:
Power-on LED
Heartbeat LED
Locator LED
Check log LED
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Lenovo NeXtScale n1200 Enclosure: Installation and Service Guide
When this LED is lit (green), it indicates that the fan power control has
power.
When this LED is lit (green), it indicates that the fan power control is
actively controlling the chassis.
When this LED is lit (blue), it indicates the chassis location in a rack.
When this LED is lit (yellow), it indicates that a system error has occurred.
Check the event log for additional information.