Troubleshooting 
5-2  HP Uninterruptible Power System T1000 XR and T1500 XR Models User Guide 
 
 
HP CONFIDENTIAL Codename: Sherman Part Number: 216164-002 Last Saved On: 8/27/02 4:15 PM 
 
Troubleshooting After Startup 
If problems occur after starting the UPS, refer to Table 5-2 for possible causes and suggested 
actions.  
 
Table 5-2:  Troubleshooting After Startup 
Symptom  Possible Cause  Suggested Action 
An audible alarm 
sounds. 
An alarm condition exists.  Identify the red LED associated with 
this alarm condition. Check this 
troubleshooting guide to determine the 
cause of the alarm. 
The Utility LED ( ) and 
On Battery LED ( ) are 
flashing red. 
The utility voltage is too high.  The utility voltage is higher than the 
UPS operating range. The UPS 
switches to battery power. If this 
happens repeatedly, update the 
configuration. 
    Contact a qualified electrician to verify 
that the utility power is suitable for the 
UPS. 
The Utility LED ( ) and 
On Battery LED (
) are 
flashing red. 
The utility voltage is too low.  The utility voltage is lower than the 
UPS operating range. The UPS 
switches to battery power. If this 
happens repeatedly, update the 
configuration. 
    Contact a qualified electrician to verify 
that the utility power is suitable for the 
UPS. 
The Utility LED ( ) and 
On Battery LED (
) are 
flashing red. 
The utility frequency is out of 
tolerance. 
Contact a qualified electrician to verify 
that the utility power is suitable for the 
UPS. 
The Utility LED ( ) is 
flashing red. 
The utility input voltage is 
outside the +20% to -30% 
nominal range. 
If this happens repeatedly, check the 
input voltage and reconfigure the UPS. 
    Contact a qualified electrician to verify 
that the utility power is suitable for the 
UPS. 
The Utility LED ( ) is 
flashing green and the 
UPS is in Standby 
mode. 
The utility power is within the 
acceptable range and the 
output is off. 
Press the On button. 
The UPS frequently 
switches between utility 
and battery power. 
There are variations in utility 
power. 
The utility voltage is frequently outside 
the UPS operating range. Update the 
configuration. 
    Contact a qualified electrician to verify 
that the utility power is suitable for the 
UPS. 
continued