Emerson GXT2-10000RT208 User Manual

UPS fails to start when the 

ON button is pressed.

UPS is short-circuited or 

overloaded.

Ensure the UPS is OFF. Disconnect all loads and ensure 

nothing is lodged in output receptacles. 
Ensure the loads are not defective or shorted internally.

Battery indicator is 

illuminated.

UPS not plugged in.

UPS is operating in Battery Mode, make certain UPS is 

securely plugged into the wall receptacle.

UPS input protection fuse 

has blown/opened.

UPS is operating in Battery Mode. Save data and close 

applications. Replace UPS input fuse, then restart UPS.

Utility voltage out of UPS 

input range.

UPS is operating in Battery Mode. Save data and close 

applications. Ensure utility supply voltage is within 

acceptable limits for UPS.

UPS has reduced battery 

time.

Batteries are not fully 

charged.

Keep UPS plugged in continuously at least 24 hours to 

recharge batteries.

UPS is overloaded.

Check load level display and reduce the load on the UPS.

Batteries may not be able to

hold a full charge due to age.

Replace batteries. Contact your local dealer, Liebert 

representative or the Liebert Worldwide Support Group for 

replacement battery kit.

Fault and Bypass indicators 

and all Load Level indicators 

are illuminated.

UPS overloaded or load 

equipment is faulty.

Check load level display and remove non-essential loads. 

Recalculate the load and reduce number of loads 

connected to UPS. Check load equipment for faults.

Fault and Bypass indicators 

and diagnostic indicator C are 

illuminated.

UPS control power supply 

fault.

UPS requires service. Contact your local dealer, Liebert 

representative or the Liebert Worldwide Support Group.

Fault and Bypass indicators 

and diagnostic indicator D are 

illuminated.

UPS PFC (Power Factor 

Correction Circuit) fault.

UPS requires service. Contact your local dealer, Liebert 

representative or the Liebert Worldwide Support Group.

Fault and Bypass indicators 

and diagnostic indicator A are 

illuminated.

UPS internal fan has a 

problem or UPS shutdown 

due to temperature 

condition. Load is on bypass 

power.

Ensure the UPS is not overloaded, ventilation openings 

are not blocked and room ambient temperature is not 

excessive. 

Wait 30 minutes to allow UPS to cool, then restart UPS. 

If UPS does not restart, contact your local dealer, Liebert 

representative or the Liebert Worldwide Support Group.

Fault and Bypass indicators 

and diagnostic indicator B are 

illuminated.

UPS internal DC bus 

overvoltage.

UPS requires service. Contact your local dealer, Liebert 

representative or the Liebert Worldwide Support Group. 

Fault and Bypass indicators 

and diagnostic indicator E are 

illuminated.

UPS inverter fault.

UPS requires service. Contact your local dealer, Liebert 

Representative or the Liebert Worldwide Support Group.

Fault and Bypass indicators 

and diagnostic indicators A 

and B are illuminated.

Inverter-to-Inverter 

Communications Failure

UPS requires service. Contact your local dealer, Liebert 

Representative or the Liebert Worldwide Support Group.

Fault indicator and diagnostic 

indicators A and C are 

illuminated.

UPS failed the battery test.

Replace batteries. Contact your local dealer, Liebert 

representative or the Liebert Worldwide Support Group.

Fault indicator and diagnostic 

indicators A and D are 

illuminated.

L1 to L2 phase angle 

unacceptable.

Only phase angles of 120, 180 or 240 degrees 

(±10 degrees) are permitted. These must be compatible 

with the selections in the configuration program.
Or the phase angle has changed while the UPS was 

running. The phase angle is detected at startup and 

cannot be changed to a different power source while 

running. 
Turn the UPS Off and wait until the fans stop. Apply input 

AC power. The UPS will reprogram the phase angle to 

match the utility, if the utility is 120, 180 or 240 degrees 

between L1 and L2. If this does not resolve the issue, 

contact a qualified electrician to verify the site wiring.