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3 NIC 1 status LED
4 NIC 2 status LED
The two NIC status LEDs indicate the LAN status for the Ethernet connector 1 and Ethernet connector 2
on the rear panel of the server.
NIC status LED Color
Description
On Green
The server is connected to a LAN.
Off
None
The server is disconnected from a LAN.
Blinking
Green
The LAN is connected and active.
5 System error LED
The system error LED helps you to determine if there are any system errors. When the system error LED is on,
check the BMC for errors. Refer to the following table for the error descriptions and actions that you can take.
Systemerror LED Color
Description Action
The temperature of the server reached
the non-critical temperature threshold.
• Check the BMC for errors and check
the system fans.
• Ensure that the ambient temperature
limit LED is off.
The voltage of the server reached the
non-critical voltage threshold.
Replace the system board.
Note: This proceduremust be performed
only by trained service personnel of
Lenovo. See Chapter 8 “Getting
information, help, and service” on page
165.
A fan has been detected to be running at
low speed.
Check the system fans.
A hot-swap fan has been removed. 1. Ensure that the system fans are
connected securely to the system
board.
2. Reinstall the removed fan or install a
new fan to replace the removed fan.
The power supply has a critical error.
Check the BMC for detailed information.
The power cord has been disconnected
from one power supply or a redundant
power supply has been removed.
1. Ensure that the power supplies are
installed securely in the server.
2. Ensure that the power cords are
connected securely to the power
supplies.
3. Install a new power supply to
replace the removed one.
On
Amber
The THERMTRIP# signal is asserted
because the system is overheated.
• Check the BMC for errors and then
check the system fans.
• Ensure that the ambient temperature
limit LED is off.
Off
None
The server is off or the server is on and
is working correctly.
20 ThinkServer RD540 User Guide and Hardware Maintenance Manual