Emerson Dual Conversion Online UPS GXT3-6000RT208 User Manual

When reporting a UPS issue to Emerson, include the UPS model and serial number. These are on the 

top panel of the Liebert

®

 GXT3

™

.

Fault and Bypass indicators 

and diagnostic C indicator are 

illuminated

UPS DC/DC fault

UPS requires service. Contact your local dealer, 

Emerson representative or Emerson Channel Support.

Fault indicator and diagnostic 

D indicator are illuminated

UPS PFC (Power Factor 

Correction Circuit) fault

UPS requires service. Contact your local dealer, 

Emerson representative or Emerson Channel Support.

Fault and Bypass indicators 

and diagnostic E indicator are 

illuminated

UPS inverter fault

UPS requires service. Contact your local dealer, 

Emerson representative or Emerson Channel Support.

Fault indicator and diagnostic 

A and C indicators are 

illuminated

UPS failed the battery test

Replace batteries. Contact your local dealer, Emerson 

representative or Emerson Channel Support.

Fault and Bypass indicators 

and diagnostic C and E 

indicators are illuminated

UPS has been shut down by a 

command from the 

communications port(s)

Your UPS has received a signal or command from the 

attached computer. If this was inadvertent, ensure the 

communication cable used is correct for your system. 

For assistance, contact your local dealer, Emerson 

representative or Emerson Channel Support.

Fault indicator and diagnostic 

A and B indicators are 

illuminated

UPS failure (includes dual-fan 

failure, single-fan failure under 

certain conditions and battery 

charger failure) and continuous 

alarm

Ensure fan is not blocked up. If the fault is not removed, 

contact your local dealer, Emerson representative or 

Emerson Channel Support.

AC input indicator is flashing.

UPS detected a line-to-neutral 

reversal or a loss of proper 

grounding for UPS; continuous 

horn and UPS cannot start up 

in standby status. This is active 

only when power is first 

applied to the input. Once the 

UPS is running, the AC input 

indicator will flash, unless the 

input wiring is correctly 

changed.

Contact a qualified electrician to verify site wiring.

Battery indicator is flashing.

Battery source is not available; 

continuous horn.

Check battery connections, completely power down and 

restart UPS.

NOTE: If the battery circuit opens while the UPS is 

running, it will be detected when the next battery test is 

performed.

Bypass indicator is flashing.

Because the voltage or 

frequency is outside 

acceptable limits, the bypass is 

disabled.

The AC input powers the PFC input and serves as the 

bypass source. If the AC is present but the voltage or 

frequency exceeds the acceptable range for safe 

operation with a load, the bypass will be disabled and 

this indicator will flash, indicating that the bypass is 

unavailable.