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TOSHIBA
Fault Display status Probable cause Corrective action
DC Inverter fault
overcurrent
DC Chopper fault
overvoltage
Contact your Toshiba
service representative.
Input Chopper fault
overcurrent
UPS system Trouble with the control
error PWB
7 - 2
7.0 Troubleshooting Procedures
7.2 Fatal Fault Mode
Fatal faults may or may not cause the UPS to shutdown. Use "System Reset" procedures
(see Section 5.10) to transfer UPS back to “On Line” mode. Use the following chart to
decode the display. All fatal faults will cause the red “Fault” LED to light continuously.
Fatal Fault Mode Display Chart
= Flashing LED = Steady-lit LED