Nexsan Unity 2200, Hardware Reference Manual, Page: 30 / 51

This table describes what each LED indicates when illuminated and any corrective action you may need to
take.
Table 4-2: Control panel LEDs
LED Description
Power
Indicates power is being supplied to the system's power supply units. This LED is
illuminated when the system is operating.
Heartbeat
Indicates that power is being supplied to the server board. This LED flashes amber to
indicate normal activity.
NIC1
Indicates network activity on the LAN1 port when flashing.
NIC2
Indicates network activity on the LAN2 port when flashing.
Power failure
Indicates a power supply module as failed. The second power supply module will take the
load and keep the system running but the failed module will need to be replaced. This LED
is OFF when the system is operating normally.
Overheat/fan failure
When this LED flashes, it indicates a fan failure.
When it is ON continuously, it indicates an overheat condition, which may be caused by
cables obstructing the airflow in the system or the ambient room temperature being too
warm.
This LED will remain flashing or on as long as the indicated condition exists.
►
Perform these steps:
1. Check the routing of the cables and make sure all fans are present and operating
normally.
2. Check to make sure that the chassis covers are installed.
3. Verify that the heat sinks are installed properly.
Drive carrier LEDs
Each drive carrier on Unity's chassis has two LEDs, a green LED on the left to indicate activity, and a red
LED on the right to indicate status.
US 224 Expansion Front panel LEDs
4
Nexsan Unity Hardware Reference Guide v. 5.1 Unity 30