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This question already has an answer here:

It was working, I finally got it to where i wanted it, then rendered it and the fire was not showing up, then i removed some extra nodes I had put in other then the flame ones needed to be added, then the box went black, and I removed the smoke and added it again, changed the setting to where they needed to be, and still I am getting black box using both the cpu or gpu

MOdded add pic, I downloaded what I uploaded, and got it working before I changed the smoke fire settings, should not matter but it is not rendering fire.

cpu or gpu with partial system.

enter image description here

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marked as duplicate by cegaton, Duarte Farrajota Ramos, m.ardito, aliasguru, Denis Aug 10 '18 at 17:09

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  • $\begingroup$ Make sure that your smoke simulation plays through correctly and/or that it is baked. I can't verify your .blend file but your simulation data may be the problem. $\endgroup$ – Tavi Kohn Jul 14 '18 at 17:42
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Don't plug volume shaders into the surface of the smoke domain.

They should be connected to the volume socket.

enter image description here

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Along with @cegaton correct answer, I too have found that after a few tries and it stops showing me the changes I make without having to bake it first, that takes time away from adjusting it until I get the desired results, it is as if the nodes get dirty and worn out, having to delete the Attribute node for flame, and giving it a new one. Then it will start "behaving" again.

I've also learned that this is not a what you see is what you get simulator. After getting it to where I wanted it, I rendered one frame and see it was way too much and had to go back to the drawing board.

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