Using the below system I have attached as a blueprint, I have noticed that if I replace the standard furnace with a blast furnace, the blast furnace correctly accepts the fuel and the items, but automation does not initialize smelting when the furnace receives its materials. The system works normally with a normal furnace, however, so this is a missing implementation in blast furnaces. It might also be present in smokers but I have not checked.
I do not believe this is intentional as the furnace still accepts the fuel and item and even puts them into the correct slots. With both slots filled, it simply does not begin smelting.
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I put cobblestone in "input", and a lava bucket in "fuel". coal did not work as a fuel source. all ores also did not smelt automatically. they always just pop into the correct slots in the Blast Furnace but smelting does not start and nothing goes to output.
@Colin Wood: Blast furnaces can not smelt stone type blocks, they are only for smelting ores/metal items.
What are you trying to smelt?