Troubleshooting  49 
1.  Check the input voltage and reconfigure the UPS ("Configuring the UPS" on page 32). 
2.  Contact a qualified electrician to verify that the utility power is suitable for the UPS. 
 
UPS is in Auto-Bypass mode 
Action: 
1.  If power management software is being used, check the log files to obtain specific error information to 
help identify the problem.  
For more information about the causes of a general fault condition, see the HP Power Manager user 
guide available for download from the HP website (http://www.hp.com/go/rackandpower). 
2.  Verify that no blockage of airflow to the front bezel and rear panel exists. 
 
UPS is on battery 
Action: Save files and shut down connected equipment. 
 
UPS is on bypass 
Possible Cause:  The UPS is in Auto-Bypass mode (on page 31). 
Action:   
The equipment transferred to bypass utility power. Battery mode is not available and the equipment is not 
protected; however, the utility power continues to be passively filtered by the UPS.   
Check for one of the following alarms:  
•  Overload 
•  Over temperature 
•  Output short 
•  Hardware failure 
 
Utility power condition 
The utility input voltage is outside the operating range. 
Action: 
1.  Check the input voltage and reconfigure the UPS ("Configuring the UPS" on page 32). 
2.  Contact a qualified electrician to verify that the utility power is suitable for the UPS.