Canon Speedlite 430EX III-RT - Manual (Page 92)

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When continuous flash or modeling flash is repeatedly fired in short
intervals, the temperature of the flash head, batteries, and the area near
the battery compartment may increase. Repeated firings of the flash
automatically activates the flash firing restriction to avoid degrading or
damaging the flash head due to overheating. When flash firing is
restricted, a warning icon is displayed to indicate the increase in
temperature, and the firing interval (with which the flash shootings can
be performed) is set automatically between approx. 8 and 25 sec.
As the internal temperature of the Speedlite increases, the warning is
displayed in two levels.
The following table shows the number of continuous flash until the
warning is displayed, and the necessary rest time (guideline) until
normal flash shooting can be performed.
* At full output.
f Flash Firing Restriction due to Temperature Increase
Temperature Increase Warning
Display
Level 1
(Firing Interval: Approx. 8 sec.)
Level 2
(Firing Interval: Approx. 25 sec.)
Icon
e f
LCD panel Red (lit) Red (blinking)
Number of Continuous Flash and Rest Time
Function
Number of Continuous
Flash to Reach Level 1
Warning (Guideline)
Necessary Interval Time
(Guideline)
Continuous flash* (p.15)
32 times or more 20 min. or longer
Modeling flash (p.36)