Canon EOS 7D Mark II Instruction Manual page 502

Troubleshooting Guide
The external flash always fires at full output.
If you use a flash unit other than an EX-series Speedlite, the flash will
always be fired at full output (p.260).
When the external Speedlite's Custom Function setting for [Flash
metering mode] is set to [TTL flash metering] (autoflash), the flash
will always be fired at full output (p.271).
Flash exposure compensation cannot be set
for the external Speedlite.
If flash exposure compensation is already set with the external
Speedlite, flash exposure compensation cannot be set with the camera.
When the external Speedlite's flash exposure compensation is canceled
(set to 0), flash exposure compensation can be set with the camera.
High-speed sync cannot be set in the <f> mode.
Under [z1: Flash control], set [Flash sync. speed in Av mode] to
[Auto] (p.263).
The camera makes a small noise when it is shaken.
When the camera's internal components slightly move, a small sound
may be heard.
The shutter makes two shooting sounds
during Live View shooting.
If you use flash, the shutter will make two sounds each time you shoot (p.287).
During Live View or movie shooting, a white
icon is displayed.
It indicates that the camera's internal temperature is high. If the white
< > icon is displayed, the still photo's image quality may deteriorate.
If the red <E> icon is displayed, it indicates that the Live View or
movie shooting will soon stop automatically (p.310, 351).
502
or red E