Y'all ain't gonna believe this one..or maybe you will. I got a ladder and removed the upper vent door and found a piece of wood panelling about the same size as the cutout wedged in the door opening. It was not attached in any way but had a few old rusty nails stuck through it. I removed the "cutout" piece to clear the opening but fans still cycle about 10 seconds off and 60 seconds on. Temp here has been in the 60's but it is low 80's today (Astor, Florida). Unit seems to be cooling well and no error codes on display. Could this just be normal operation? I plan to call Norcold customer service on Friday. MERRY CHRISTMAS TO ALL!