WARNING DISPLAYS 
Your transmitter is designed to warn you about several potential problems that may occur, 
including low battery voltage and switching on with mixing functions active.  Each display has a 
unique sound associated with it, as described below. 
Low battery 
flashing
 
Warning sound: Beep beep beep — 
(beeping does not stop 
until transmitter is 
turned off) 
The LOW BATTERY warning is displayed 
when the transmitter battery voltage drops below 
8.5V. 
 
LAND YOUR MODEL AS SOON AS 
POSSIBLE BEFORE LOSS OF CONTROL 
DUE TO A DEAD BATTERY. 
Backup error
 
 
Warning sound: Beep beep beep beep 
(repeated) 
The BACKUP ERROR warning occurs when 
the transmitter memory is lost for any reason. If 
this occurs, all of the data will be reset when the 
power is turned on again. 
DO NOT FLY when this message is 
displayed – all programming has been erased 
and is not available. Return your transmitter 
to Futaba for service. 
Mixer warning
 
flashing
 
Warning sound: beep beep beep pause 
(repeated) 
The MIXER warning is displayed to alert you 
whenever you turn on the transmitter with any of 
the mixing switches active.  This warning will 
disappear when the offending switch or control is 
deactivated.  At power-up, warnings will be 
issued for the following switches:  
ACRO: Airbrake 
HELI: Throttle hold, idle-up 
 
 
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