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Troubleshooting
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7.0 TROUBLESHOOTING
If any technical problems should occur, check the following before contacting Liebert
®
technical
support:
• Is the utility voltage present at the UPS input?
• Has the input fuse blown or have the circuit breakers tripped?
• Has the UPS startup procedure been followed correctly?
When contacting Liebert technical support, have the following information available:
• Device model number
• Serial number (from the nameplate)
• Exact description of the problem (what loads are being operated, does the problem occur regularly
or sporadically, etc.)
For descriptions of the indicators mentioned in the following table, see 4.2.1 - Controls and
Messages.
Table 8 Troubleshooting guide
Problem Possible Cause Solution
No display
No alarm
(UPS switched Off)
Utility mains switched off Switch on utility breaker
No mains voltage present
Have utility mains inspected by a qualified
technician
Input fuse blown or input
circuit breaker tripped
Replace with fuse of same type or switch on circuit
breaker. If the problem persists, contact technical
support.
UPS on LED does not light up,
alarm beeps sound at intervals
No utility mains voltage
present
Have utility mains inspected by a qualified
technician
UPS on LED does not illuminate
when utility mains voltage present,
acoustic alarm active at intervals
Input fuse defective or input
circuit breaker tripped
Replace with fuse of same type or switch on circuit
breaker. If the problem persists, contact technical
support
FAULT LED illuminates, alarm
sounding constantly
UPS error Contact technical support
Overheating Decrease ambient temperature
Battery Run time less than specified
The battery breaker is open,
in the OFF position
Move the battery breaker to the ON position
Batteries are not fully charged
Charge batteries (see Battery Test on page 19)
and test backup time. If the problem persists,
contact technical support.
Batteries are defective Contact technical support
Charging device is defective Contact technical support
OVERLOAD message displayed Overload at UPS output Reduce load to the permissible value
No communication between UPS
and PC
Wrong serial connection
cable
Check whether the correct cable has been used
(standard modem/null modem cables are not
permissible)
Interface on the PC is being
used by another process or is
defective
Check whether other software/service is accessing
the interface on the PC; try selecting a different
serial interface
Interference on the data cable Lay cable differently/Reinstall cabling