Emerson GXT2U User Manual

UPS fails to start 

when the ON button 

is pressed.

UPS is short circuited or over-

loaded.

Ensure UPS is OFF. Disconnect 

all loads and ensure nothing is 

lodged in output receptacles. 

Ensure loads are not defective 

or shorted internally.

Battery indicator 

LED is illuminated.

UPS not plugged in.

UPS is operating from battery 

mode, make certain UPS is 

securely plugged into the wall 

receptacle.

UPS input protection fuse has 

blown/opened.

UPS is operating from battery 

mode. Save data and close 

applications. Replace UPS 

input fuse, then restart UPS.

Utility voltage out of UPS input 

range.

UPS is operating from battery 

mode. Save data and close 

applications. Ensure utility sup-

ply voltage is within acceptable 

limits for UPS.

UPS has reduced 

battery time.

Batteries are not fully charged.

Keep UPS plugged in continu-

ously 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 representa-

tive or the Liebert Worldwide 

Support Group for replacement 

battery kit.

Fault and Bypass 

indicator LEDs and 

all load level LEDs 

are illuminated.

UPS overloaded or load equip-

ment is faulty.

Check load level display and 

remove non-essential loads. 

Recalculate the load and 

reduce number of loads con-

nected to UPS. Check load 

equipment for faults.

Fault and Bypass 

indicator LEDs and 

diagnostic LED A are 

illuminated.

UPS internal fan has a problem 

or UPS shutdown due to tem-

perature condition. Load is on 

bypass power.

Ensure UPS is not overloaded, 

ventilation openings not 

blocked, or room ambient tem-

perature is not excessive. Wait 

30 minutes to allow UPS to 

cool, then restart UPS. If UPS 

does not restart, contact your 

local dealer, Liebert representa-

tive or the Liebert Worldwide 

Support Group.

Fault and Bypass 

indicator LEDs and 

diagnostic LED B are 

illuminated.

UPS internal DC bus overvolt-

age.

UPS requires service. Contact 

your local dealer, Liebert repre-

sentative or the Liebert World-

wide Support Group. 

Fault and Bypass 

indicator LEDs and 

diagnostic LED C 

are illuminated.

UPS control power supply fault.

UPS requires service. Contact 

your local dealer, Liebert repre-

sentative or the Liebert World-

wide Support Group.