Nikon D3400 Two Lens Kit Owner's Manual

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This section lists the indicators and error messages that appear 
in the viewfinder and monitor.
Error Messages
A
Warning Icons
A flashing 
d in the monitor or s in the viewfinder indicates that a 
warning or error message can be displayed in the monitor by pressing 
the 
W (Q) button.
Indicator
Solution
Monitor
Viewfinder
Lens not attached
F/s 
(flashes)
• Attach compatible lens.
• If lens is not type E or G, select mode M.
Before taking photos, 
rotate the zoom ring to 
extend the lens.
F
(flashes)
A lens with a retractable lens barrel 
button is attached with the lens barrel 
retracted. Press the retractable lens 
barrel button and rotate the zoom ring 
to extend the lens.
Shutter release 
disabled. Recharge 
battery.
d/s 
(flashes)
Turn camera off and recharge or replace 
battery.
This battery cannot be 
used. It does not 
communicate properly 
with this camera. To 
use the camera safely, 
choose a battery 
designated for use in 
this camera.
d
(flashes)
Use Nikon-approved battery.
Initialization error. 
Turn camera off and 
then on again.
d/
(flashes)
Turn camera off, remove and replace 
battery, and then turn camera on again.