Here's what I have ferreted out so far. Am I missing any?
Disconnected - Indicates that the DJI Go app has lost WiFi connectivity to the remote controller. Video Downlink Signal and Remote Controller Signal icons will show no bars. Screen will be greyed out.
No Signal - Indicates that the remote controller is no longer receiving WiFi (2.4Ghz) or RC Signals (5.8Ghz) from the AC. Video Downlink Signal and Remote Controller Signal icons and will show no bars.
Image Transmission Signal Weak - Indicates that the WiFi Video downlink (2.4Ghz) from the AC to remote controller is weak. Video Downlink Signal icon will be two bars or less and pilot could experience intermittent or frozen video feed.
Remote Controller Signal Weak - Indicates that the remote control signal (5.8Ghz) to the AC is weak. Remote Controller Signal icon will be two bars or less and typically red. Pilot could experience intermittent or frozen flight control of the AC.
RC Signal Lost
No Image Transmission Signal
IMU Error, please calibrate the IMU - Indicates the Inertial Measurement Unit (IMU) is having an issue. Typically the IMU is having an issue determining what is straight and level which can result in the AC not flying true or gimbal tilt or both. Pilot should place AC on straight, level, vibration-free surface and conduct an IMU Calibration to reset the IMU.
Compass error, please move the aircraft or calibrate the compass - Indicates the AC is receiving abnormal compass readings. It is recommended that you power off the aircraft and re-calibrate the compass at a different location and then resume the flight.
Compass error, Exit P-GPS mode - This warning message indicates that the aircraft is drifting severely. Bring the aircraft to a higher altitude to acquire connections with enough GPS satellites when this warning message appears. The flight controller will automatically adjust the orientation of the aircraft in the midair to mitigate the drifts. The aircraft will switch back to P-GPS mode when the automatic adjustment is completed.
Low Power Warning
Low battery - Appears when battery level has hit the Low Battery Warning setting. Pilot will still have full control of AC. The AC will automatically return to Home Point if no action is taken after 10 seconds, but pilot can resume normal flight by tapping Return-to-Home (RTH) icon on DJI GO app or toggling the S1 switch
Low battery, aircraft landing - Appears when battery level has hit the Critical Battery Warning setting. AC initiates an auto landing sequence at it's present position. Pilot will have some limited vertical and horizontal manuverability but will not be able to cancel descent.
Safe to Fly (GPS)
Safe to Fly (Non-GPS)
MC Data Error - Typically an indication that there is an issue with the internal SD card that the AC flight data log is written to e.g. either SD card is full or corrupted. Pilot should land the craft at the earliest convenience to avoid no logging and power cycle the AC to free up space. Error does not impact ability to fly AC but no log data will be recorded until the issue is addressed.
Battery Error, please check
Gimbal motor overloaded - Typically indicates that the gimbal motors are sensing something that is preventing the free travel of the gimbal. Can be an obstruction on the ground, e.g. tall grass, etc. or could be a broken damper holding the gimbal to the AC while in flight. Error does not affect ability to fly the AC but could impact ability to control gimbal.
Signal lost, aircraft going home