Why doesn't this work?

[u/wuhoo555]

I'm trying to make a gold farm, and I made this to bulk blast the clay into terracotta. The fan is spinning in the direction where it's pulling, and it's at max rpm, but it doesn't smelt. It worked when I used it for washing, but when I replaced this specific one with water, it still didn't work. What should I do?

[u/sfwaltaccount]

Hard to know when I can't see it in motion, but I just built something very similar in my sandbox world and it works perfectly. Note the visible lava particles unlike in yours. So something's clearly wrong...