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Troubleshooting
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Fault messages displayed can, in some cases, be investigated for a solution. Listed below in Table 17
are troubleshooting steps for the Fault messages that can occur.
Refer to the general drawings in Appendix D.0 - Installation Drawings for the location of system
components.
If a Fault condition persists contact your Liebert technician. You may also visit the Liebert Web site
at www.liebert.com for information.
Table 17 Troubleshooting
Fault Label Troubleshooting Action
GROUND FAULT Contact Service provider. Schedule service.
HW BUS OV Check DC bus voltage at UPS and adjust as necessary to within threshold.
X PHASE OC Check IGBT, resistor diodes.
IGBT OVRTEMP Check cooling pump, test pump and fans.
VACUUM FAULT Check in History, Vitals, collect data, contact Certified Service Provider.
RUNOUT FAULT Check in History, Vitals, collect data, contact Certified Service Provider.
MISER FAULT Check calibration in Tools.
BEARING Contact Service provider. Schedule service.
AUX POWER LOW Check and test Auxiliary Power module.
INTER PRCR COMM Contact Service provider. Schedule service.
PWR SPLY VOLT Check data in Menu>View>Electrical.
UNDEF PDP INT Contact Service provider. Schedule service.
CURRENT OFFSET Contact Service provider. Schedule service.
SW OV Contact Service provider. Schedule service.
CHECKSUM Contact Service provider. Schedule service.
CONTACTOR TIME OUT Check DC bus voltage at UPS and adjust as necessary to within threshold.
CONTACTOR CLOSE FAIL Check DC bus voltage at UPS and adjust as necessary to within threshold.
FAN OPEN Check fan connections.
FAN SHORT Check fan.
PUMP OPEN Check pump connections.
PUMP SHORT Check pump.
HW OVERSPEED Contact Service provider. Schedule service.
PRECHARGE PROTECTION Contact Service provider. Schedule service.
BUS CURRENT OFFSET Check bus voltages, contact service provider to calibrate settings.