24
Problem
Possible Cause
How to React
No LEDs are on, and no alarm is
sounding. The UPS is not operating.
The UPS is on but is not supplying
power to the equipment.
• No input power may be available to
the UPS. (An extended power outage
may have occurred.)
• The input circuit breaker on the back
of the UPS may have been tripped.
The output circuit breaker on the back
of the UPS may have been tripped.
• Check the AC input power supply.
• Reset the breaker and restart the UPS.
Reset the breaker.
The green Line (~) LED is not on even
though AC line input seems to be
available, and the UPS beeps every few
seconds.
• No input power may be available to
the UPS.
• The output circuit breaker on the back
of the UPS may have been tripped.
• Check the AC input power supply.
• Reset the breaker and restart the UPS.
The amount of time that the UPS can
run on battery is less than the rating.
The battery may not be fully charged or
it may be bad, or the charger may have
failed.
Recharge the battery for at least 10
hours by connecting the UPS to a
source of AC line input. Then, retest
the battery backup time. If the problem
has not been solved by recharging the
batteries, phone the nearest Best Power
office.
The yellow Battery LED is flashing.
The battery voltage is low.
Recharge the battery for at least 10
hours by connecting the UPS to a
source of AC line input. If the problem
continues, phone the nearest Best
Power office.
600 Troubleshooting
If the red Alarm LED at the top of the front panel is on, see Section 504. If not, use the table below to
troubleshoot UPS problems.
Make sure the UPS is connected to AC input power and that the AC input voltage is within the limits specified
in Section 900. Make sure the fuse or circuit breaker on the back panel has not been tripped.
If you are not able to solve the problem, contact the nearest Best Power office. Make sure you have your unit’s
model number, serial number, the date of the purchase, and a full description of the problem available when you
call.
