Possible Cause
Symptom
What To Do
Press and release the On/Off/
Test button to start UPS
On/Off/Test button not
pushed
UPS will not turn on
Reset circuit breaker by
pressing the plunger back in.
If the AC circuit breaker trips
after UPS starts up, reduce
the load on the UPS
UPS operates in
battery mode only,
even though there
is normal AC
present
Input AC circuit breaker is
tripped
UPS has detected an
internal fault
Call for service
Fault LED is
illuminated
The AC normal
LED is illuminated,
but there is no out-
put
Incorrect service wiring
Disconnect the computer
cable from the UPS and press
the On button. If UPS works
normally, the software has
control of the UPS
The UPS is being
controlled via its
communications port
Site Wiring Fault
LED is illuminated
Have a Qualified Electrician
correct the service wiring
The batteries may be weak
or at the end of useful
service life
Charge the batteries for 8-
hours and retest. If the runtime
is still less than expected, the
batteries may need to be
replaced, even though the
Weak/Bad Battery LED is not
illuminated
UPS does not
provide expected
runtime
Weak/Bad Battery
LED is illuminated
Overload LED is
illuminated and a
constant alarm
The Boost LED or
Buck LED is blink-
ing.
UPS occasionally
emits a beep
Loose connections at the
batteries, Weak batteries,
Bad batteries
Normal operation
The load has exceeded the
UPS's capacity
The UPS is in either the
Boost mode or the Buck
mode
Check battery connections,
charge the batteries for 8-
hours, replace the batteries
The UPS is performing its
intended function
Check the specifications (see
section 8). Remove part of
the load
The UPS is performing its
intended function
TROUBLESHOOTING
5
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