Hitachi Compute Blade 2500 Getting Started Manual page 62

The indicators of the fan module are described below.
1 PWR LED
.
This LED lights up when the fan module is powered on.
2 ARM LED
.
This LED lights up when a failure occurs on the fan module.
2-26
Figure 2-31 Fan module indicators
CB 2500 Appearance
Hitachi Compute Blade 2500 Series Getting Started Guide