The electric circuit on these is very simply from a troubleshooting point of view. There is even a full wiring diagram in the manual.
I'd take off the small back panel on the electrical box, plug in the furnace and change the damper override switch position ever 10 seconds or so. Watch the damper control wheel to see if it turns about a 1/4 turn back and forth. See if the rod has fallen out of one of the holes in the wheel. My unit was bumped around when delivered and my control rod fell out. I couldn't get the draft to open at all. Guaranteed, without that draft open, you didn't get the firebox hot enough to trigger the fans.
Oh, and as an overall update, the furnace is fantastic. Maybe a bit cheap in construction, but for the price fantastic. I still haven't hooked up any duct work and it heats my two story house. I burn a lot of dead, standing ash and elm. Half punky and almost soft. It pulls heat out of the worst quality wood as long as it's dry...