Canon EOS-1D C - Manual (Page 70)

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This indicates that the camera’s internal temperature is high. If the
white <
> icon is displayed, still photo image quality may deteriorate.
If the red <E> icon is displayed, movie shooting will soon stop
automatically (p. 55).
If the card’s writing speed is slow, movie shooting may stop
automatically. See page 17 for the writing/reading speed required
(Required Card Performance) for the respective movie-recording
quality. To find out the card’s writing/reading speed, refer to the card
manufacturer’s website.
Shoot a few test movies to see if movies can be recorded accurately
with a movie-recording size you set (p.34) on the card.
If the shooting mode is <d/s/f/BULB>, the ISO speed will be set
automatically. In the <a> mode, you can freely set the ISO speed
(p.24).
Under [z2: ISO speed settings], if [ISO speed range]’s [Maximum]
is set to [51200/H] or higher, the manual setting range’s maximum will
be expanded to enable ISO 32000/40000/51200 to be set. However,
since movie shooting at ISO 32000/40000/51200 may result in
substantial noise, the expanded ISO speed (“H” displayed) will be
used.
Troubleshooting Guide
A white icon or red E icon is displayed.
Movie shooting stops by itself.
The ISO speed cannot be set.
ISO 32000/40000/51200 cannot be set.