Futaba 3PL 2.4GHz FHSS - Manual (Page 26)

26 Reference
Low Battery Alarm
If the transmitter battery voltage drops to 4.2V or less, an audible alarm will sound
and "LOW v" will be displayed on the LCD screen.
LCD screen:
Backup Error
If the data is lost for an unknown reason, an audible alarm will sound and "ERR" will be
displayed on the LCD screen.
LCD screen:
RF Error
If the RF circuit fails for an unknown reason, an audible alarm will sound and "RF" will
be displayed on the LCD screen. Please request repair from the Futaba Service Center.
LCD screen:
Error Displays
ｎWARNING
ｊ When a low battery alarm is generated, cease operation
immediately and retrieve the model. If the battery goes dead
while in operation, you will lose control.
ｎWARNING
ｊ When a backup error is generated, immediately stop using the
system and request repair from the Futaba Service Center. If
you continue to use the system, the transmitter may malfunction
and cause loss of control.