Canon 600exrt not firing

[write2zulfi]

The led indicates red only. Not green. Hence not firing. Also an exclamation symbol appears on display along with ettl

[rs-eos]

What mode are you using? light-of-sight or radio signals?

How are you controlling that speedlite? Via a slave flash, or ST-E3-RT radio controller?

Once we have more details, we can then help to troubleshoot.

[RobertTheFat]

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@write2zulfi wrote:
The led indicates red only. Not green. Hence not firing. Also an exclamation symbol appears on display along with ettl

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I don't know why it's not firing, but I think you're misinterpreting the LED. Check your manual. IIRC, red means that the unit has reached its full firing power, while green means that it hasn't. (Yeah, I know that's counterintuitive, but it is what it is.)

[kvbarkley]

There are two LED's on the back. One is the standard flash ready and the other is the Link Status for RF