Greetings from the Florida Panhandle
First off, welcome to the Forums. We're glad to have you with us. Your description of the problem with the cooling fan on your converter definitely sounds like a bad fan controller. I would think that this issue should be fully covered under warranty by either Airstream or Parallax.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)