Falcon FN3K-2TXI Owner's Operating Manual page 23

If the UPS passes the self-test,
"OK" is displayed.
If the UPS fails the self-test,
"FAIL" is displayed alternately
with an error code. Please note
the error code and contact Falcon
Service.
The UPS is now turned on and
in on-line inverter mode. Using an
AC volt meter, verify the UPS
input voltage measurement.
23