Nikon D780 DSLR Camera (Body Only) - Manual (Page 811)

765 Troubleshooting
This section lists the alerts and error messages that appear in
the viewfinder, control panel, and monitor.
Alerts
The following alerts appear in the control panel and viewfinder:
Alerts and Error Messages
Alert
Problem/solution Control
panel
Viewfinder
B
(flashes)
B
(flashes)
Lens aperture ring is not set to minimum
aperture.
Set lens aperture ring to minimum aperture
(highest f-number).
H d
Low battery.
Ready spare battery.
H
(flashes)
d
(flashes)
Battery exhausted.
• Replace with spare battery.
• Charge battery.
Battery info not available.
• Battery cannot be used. Contact Nikon-
authorized service representative.
• Battery level is extremely low; charge battery.
Battery cannot supply data to camera.
Replace third-party batteries with genuine Nikon
batteries.
High battery temperature.
Remove battery and wait for it to cool.