E-flite UMX Extra 300 3D BNF - Manual (Page 11)

11
EN
Troubleshooting Guide
Problem Possible Cause Solution
Aircraft will not respond
to throttle but responds to
other controls
Throttle not at idle and/or throttle trim
too high
Reset controls with throttle stick and throttle
trim at lowest setting
Throttle channel is reversed Reverse throttle channel on transmitter
Extra propeller noise or
extra vibration
Damaged propeller and spinner, propeller
shaft or motor
Replace damaged parts
Nut on prop shaft is too loose Tighten the prop shaft nut 1/2 turn
Reduced flight time or
aircraft underpowered
Flight battery charge is low Completely recharge flight battery
Propeller installed backwards Install propeller with numbers facing forward
Flight battery damaged Replace flight battery and follow flight
battery instructions
Flight conditions may be too cold Make sure battery is warm before use
Battery capacity may be low for flight
conditions
Replace battery or use a larger capacity
battery
LED on receiver flashes
rapidly and aircraft will
not respond to transmit-
ter (during binding).
Transmitter too near aircraft during binding
process
Power off transmitter, move transmitter a
larger distance from aircraft, disconnect and
reconnect flight battery to aircraft and follow
binding instructions.
Aircraft not bound to transmitter Bind transmitter to aircraft receiver
LED on receiver flashes
rapidly and aircraft will
not respond to transmit-
ter (after binding).
Less than a 5-second wait between first
powering on transmitter and connecting
flight battery to aircraft
Leaving transmitter on, disconnect and
reconnect flight battery to aircraft
Aircraft bound to different model memory
(ModelMatch radios only)
Select correct model memory on transmitter
and disconnect and reconnect flight battery
to aircraft
Flight battery/Transmitter battery charge
is too low
Replace/recharge batteries
Control surface does not
move
Control surface, control horn, linkage or
servo damage
Replace or repair damaged parts and
adjust controls
Wire damaged or connections loose Do a check of wires and connections,
connect or replace as needed
Flight battery charge is low Fully recharge flight battery
Carbon fiber control rods stuck on support Free carbon fiber control rods from support
Controls reversed Transmitter settings reversed Do the Control Direction Test and adjust con-
trols on transmitter appropriately
Motor loses power Damage to motor, propeller shaft or power
components
Do a check of batteries, transmitter,
receiver, motor and wiring for damage
(replace as needed)
Nut on prop shaft is too tight Loosen prop shaft nut until propeller shaft
turns freely
Motor power decreases
and increases then
motor loses power
Receiver uses default soft Low Voltage
Cutoff (LVC)
Recharge flight battery or replace battery
that is no longer performing
Servo reaches full travel
before transmitter stick is
at maximum deflection.
Radio has sub-trim set to value other than
0, or Travel adjust value is set above 100%
Set sub-trim to 0, and/or set Travel adjust
to 100% or less, then mechanically adjust
pushrod length to re-center surfaces.