Node operator panel
Node operator panel is a system of LEDs on various external and internal components of the solution that leads you to the failed component. When an error occurs, LEDs are lit on the on the operator panel on the front of the node, then on the failed component. By viewing the LEDs in a particular order, you can often identify the source of the error.
|1 System-error LED (yellow)
|LED on: An error has occurred.