Section VIII
Trouble-Shooting Guide
006-0006205
UPS-1500 Series
Rev ZC
56 of 60
05/28/2019
LED
Indication
Possible Problem(s)
C0:
Fan Service
Required LED
LED is AMBER
• One or both fans have recently had degraded performance but seem
to be ok now. The UPS is running a diagnostic test.
LED is RED
• One or both fans presently have degraded performance, even if they
are running, and service is recommended at the earliest convenient
time.
• Ensure that the fan blades are not obstructed from turning
C1:
Battery
Pack Service
Required LED
LED is AMBER
• The battery pack’s calculated maximum energy storage capacitor is
<75% of its rated value. The UPS’s battery run-time will therefore be
similarly reduced.
• The battery pack should be replaced at the earliest convenient time
if this derated battery run-time is unacceptable.
LED is RED
• The battery pack’s calculated maximum energy storage capacitor is
<50% of its rated value. The UPS’s battery run-time will therefore be
similarly reduced.
• The battery pack should be replaced at the earliest convenient time.
All 16
LEDs:
All LEDs are OFF
• The battery pack is not fully inserted into the UPS with its thumb
screws tightened.
• The terminal on the battery pack is damaged or dirty.
• The battery pack is defective and needs to be replaced.
Audible
Alarm:
(pattern
repeats every
5 seconds)
One tone
• The UPS is drawing power from the battery pack and is discharging it.
• Sources of power should be restored or preparations made to shut
down the loads
Two tones
• The total UPS load power is above 1250 W.
• Loads should be reduced if this condition persists.
Three tones
• The AC OUTPUT has experienced either a short circuit or a load
having a start-up surge current characteristic that the UPS could not
start. The AC OUTPUT has therefore turned OFF. The DC output may
still be powered.
• To reset, the UPS must be turned OFF and then ON.
Four tones
• The UPS is drawing power from the battery pack and its remaining
charge is <10% of its rated charge.
• Sources of input power should be restored or the loads should be
shut down.
