Litter Robot's light is flashing yellow and will not work

Hello,
I recently bought a refurbished Litter Robot Open Air and it arrived today. When I pulled it out f the box I saw that some assembly was required. It did not have a user manual with it but I looked it up online and reassembled the unit, The problem is that when I turn on the power the yellow light just blinks rapidly and nothing else happens. I have tried reattaching the bonnet and anything else I could find online to make it work… Nothing is happening. It is extra frustrating because I received this on a Friday afternoon on the West Coast so I know I will not be able to get any help with the issue for several days. Do I need to send the unit back? What does the blinking light even mean? Thank you

litter-robot.com/manual_pdf … e-2016.pdf