Reflow oven heater error

Continuing the discussion from Air is a poor conductor for 3.3v circuits:

Uh, yeah, that was me. I meant to ask you about that. I had it by the 3D printers so I could bake a couple of test boards for the badge readers while I was doing some maintenance/organizing in the Fab Lab. The next time I came in it had been moved back to the ERP, and when I tried to fire it up it gave a heater error. I was trying to figure out if there was a way to remove/inspect the heaters, but I couldn’t find any obvious way to do it, or any instructions online. So I started… disassembling. All the bits should still be on the table next to it. I haven’t been able to figure out the issue yet.

Lol heater error eh? Hmm whell that sounds solvable. Let me get a few more things in order and we can get that back up and running.