Canon Speedlite 600EX II-RT Manual (en)

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When continuous flash, stroboscopic 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.
When you perform firing repeatedly, the firing interval increases in 
steps within the range of up to approx. 4 sec. to avoid degrading 
or damaging the flash head due to overheating. When you perform 
firing repeatedly even more in this state, flash firing is restricted 
automatically.
Furthermore, when flash firing is restricted, a warning icon is 
displayed to indicate the increase in temperature, and the firing 
interval (with which the flash photography can be performed) will 
be automatically set to approx. 8 sec. (level 1) or approx. 20 sec. 
(level 2).
As the internal temperature of the Speedlite increases, the warning is 
displayed in two levels. When you perform continuous firing repeatedly 
even more in the state in level 1, the state changes to level 2. 
f Flash Firing Restriction due to Temperature Increase
Temperature Increase Warning
Display/Tone
Level 1
(Firing Interval: Approx. 8 sec.)
Level 2
(Firing Interval: Approx. 20 sec.)
Icon
e
f
LCD panel 
illumination
Red (lit) 
Red (blinking) 
Beep
When C.Fn-20 is set to 1: warning beep on