Filter
Top Products
Troubleshooting 29
Troubleshooting
In this section
LED and audible alarm troubleshooting..................................................................................................... 29
UPS does not start .................................................................................................................................. 30
UPS operates on battery only................................................................................................................... 30
UPS frequently switches between utility and battery power .......................................................................... 30
UPS does not provide the expected backup time........................................................................................ 30
UPS cannot communicate with the host computer ....................................................................................... 31
UPS emits a slight clicking noise............................................................................................................... 31
Site Wiring Fault LED is red ..................................................................................................................... 31
LED and audible alarm troubleshooting
Condition
Power On
LED
(green)
On Battery
LED
(yellow)
Overload
LED
(red)
General
Alarm LED
(red)
Audible alarm
Can alarm
be silenced
("Silencing
an audible
alarm" on
page 22)?
UPS operating from
utility
On Off Off Off No audible alarm N/A
Buck mode (high
input voltage)
On Off Off Off No audible alarm N/A
Boost mode (low
input voltage)
On Off Off Off No audible alarm N/A
Over temperature
condition
On On Off Flashing On—Continuous No
Battery test failure Off On Off Flashing On—Continuous Yes
Fan failure On Off Off Flashing On—Continuous No
Output short circuit On On On Flashing On—Continuous No
Power up failure
from a DC start—Low
battery (no utility
power)
Flashing Flashing Flashing Flashing
On—3 beeps/10
seconds
No
Low battery (no utility
power)
Off Flashing Off Off
On—2 second
beep
No
Online—UPS power
capacity exceeded
On Off On Off
On—1 second
beep
No
Overload timeout Off Off On Flashing On—Continuous No
On battery—Input
voltage is out of
range
On On Off Off
On—2 second
beep
Yes