Compaq R6000 - Manual (Page 15)

Introduction 1-5
Front Panel LEDs
The front panel has four LEDs to indicate the UPS operating mode.
Figure 1-3. The front panel
LED LED Color LED Meaning
1 Green Solid green means normal operation.
Flashing green means Standby.
2 Yellow Solid yellow means the UPS is on Battery;
flashing yellow means UPS is on Battery and
Standby
3 Yellow Solid yellow means the UPS is on Bypass.
4 Red Solid red means current or impending problems.