Status Color Description
On Green
The server is connected to a network.
Blinking
Green
The network is connected and active.
Off
None The server is disconnected from the network.
Note: If the network activity LED is off when an OCP 3.0 module is installed,
check the network ports in the rear of your server to determine which port is
disconnected.
3 System ID button with system ID LED
Use this system ID button and the blue system ID LED to visually locate the server. A system ID LED is also
located on the rear of the server. Each time you press the system ID button, the state of both the system ID
LEDs changes. The LEDs can be changed to on, blinking, or off. You can also use the Lenovo XClarity
Controller or a remote management program to change the state of the system ID LEDs to assist in visually
locating the server among other servers.
If the XClarity Controller USB connector is set to have both the USB 2.0 function and XClarity Controller
management function, you can press the system ID button for three seconds to switch between the two
functions.
4 System error LED
The system error LED helps you to determine if there are any system errors.
Status Color
Description Action
On Yellow
An error has been detected on the server. Causes might include
but are not limited to the following errors:
• The temperature of the server reached the non-critical
temperature threshold.
• The voltage of the server reached the non-critical voltage
threshold.
• A fan has been detected to be running at low speed.
• A hot-swap fan has been removed.
• The power supply has a critical error.
• The power supply is not connected to the power.
Check the event log to
determine the exact cause
of the error.
Alternatively, follow the
light path diagnostics to
determine if additional
LEDs are lit that will direct
you to identify the cause of
the error.
Off None
The server is off or the server is on and is working correctly. None.
External diagnostics handset
The external diagnostics handset is an external device that is connected to the server with a cable, and it
allows quick access to system information such as errors, system status, firmware, network, and health
information.
Note: The external diagnostics handset is an optional part that needs to be purchased separately.
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ThinkSystem SR645 V3 User Guide
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