I decided to try out automatons for the first time. Things were going smoothly until I ran out of coal for a while. Two of my automatons were unable to refuel. I found them sitting in a corner asleep (showing zzz). Their status showed idle, fuel at 0%. they were never refueled by gnomes. I thought, okay, I'll disassemble them and rebuild them. So I clicked disassemble for each one, and now they're sitting in the corner, asleep, with the disassemble button pressed.
What is required for a gnome to refuel an automaton that has run out of fuel, and what is required for an automaton to be disassembled?