Futaba 8UHFS, 8UHPS - Manual (Page 19)

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An alarm or error indication may appear on the display of your transmitter for several reasons,
including when the transmitter power switch is turned on, when the battery voltage is low, and
several others. Each display has a unique sound associated with it, as described below.
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.
Warning sound: Beep beep beep beep beep
(repeated 3 times)
The MODEL SELECTION warning is displayed
when the transmitter attempts to load a model
memory from a memory module that is not currently
plugged into the transmitter. When this occurs,
model No. 01 is automatically loaded.
Do not fly until the proper model is loaded
into memory! Reinsert the memory module, and
recall the desired setup using the model select
function.
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.
Warning sound: beep beep beep beep beep
space (repeated)
The MIXER ALERT 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. Switches for which warnings will be
issued at power-up are listed below:
ACRO: Throttle cut, idle-down, snap roll, airbrake
GLID: Butterfly, throttle cut, idle-down
HELI: Throttle cut, inverted, throttle hold, idle-up
(Operation when switch OFF does not stop the mixing warning)
When the warning does not stop even when the mixing switch indicated by the warning
display on the screen is turned off, the functions described above probably use the same
switch and the OFF direction setting is reversed. In short, one of the mixings described above
is not in the OFF state.
In this case, reset the warning display by pressing (+)/(-) keys simultaneously. Then change
one of the switch settings of the mixings duplicated at one switch.