Problem Possible cause Remedy
EPO active
Alarm Code:71
EPO function is enabled Turn off the EPO switch.
Bus fault (Low / high /
Unbalance / Soft start)
Alarm Code: 22/21/23/25
UPS internal fault Consult your supplier
Inverter fault (Low/high/soft
start) Alarm Code:33/32/34
UPS internal fault Consult your supplier
Over temperature fault
Alarm Code:81
Over temperature Check the ventilation of the UPS, check
the ambient temperature and ventilation.
NTC open Alarm Code:87 UPS internal fault Consult your supplier
Inverter short Alarm
Code:31
Output short circuit Remove all the loads. Turn off the UPS.
Check whether the output of UPS and
loads is short circuited. Make sure the
short circuit is removed, and the UPS has
no internal faults before turning on again.
Bus short Alarm Code:24 UPS internal fault Consult your supplier
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