11 TROUBLESHOOTING
This section indicates various UPS symptoms a user may encounter and provides a troubleshooting guide in the event the
UPS develops a problem. Use the following information to determine whether external factors caused the problem and how
to remedy the situation.
11.1 UPS Symptoms
The following symptoms indicate the Liebert GXT3 is malfunctioning:
• The relative indicators illuminate, indicating the UPS has detected a problem.
• An alarm buzzer sounds, alerting the user that the UPS requires attention.
11.1.1 Indicators
In addition to the fault indicator being illuminated, one or more of LED segments of battery level indicator will also be
illuminated to provide a diagnostic aid to the user, as shown in Figure 11.1 below. The descriptions are listed in Table 11.1
below.
Figure 11.1 Battery level indicator
INDICATOR DESCRIPTION
A - E On bypass from output overload (half-second beep every half-second)
A On bypass due to overtemperature condition (1-second beep every 4 seconds)
B On bypass due to DC bus overvoltage (1-second beep every 4 seconds)
C On bypass due to DC/DC power supply failure (1-second beep every 4 seconds)
D PFC failure (1-second beep every 4 seconds)
E On bypass due to inverter failure (1-second beep every 4 seconds)
A&B
UPS Failure (includes dual-fan failure, single-fan failure under certain conditions and battery charger failure) and continuous
alarm
A&C UPS failed battery test (2-second beep every 60 seconds)
A&D Maintance bypass switch on (continuous)
A&E Bypass feedback (1-second beep every 4 seconds)
B&C REPO (one quarter-second beep at quarter-second intervals)
B&E Short circuit on the output
C&E
UPS shutdown by command from communication (USB port or Liebert IntelliSlot
®
port) (no audible)
Utility LED flash L-N reverse
Table 11.1
Indicator descriptions
Vertiv | Liebert® GXT3 ™ Installer/User Guide | 53
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