I had this problem in an older Pace Arrow. It was a 6 gal though. I tried everything to no avail. I reset the air adjustment, I checked the igniter, I changed the mother board, and nothing helped. I ended up making up a clip where I could open up the door a couple of inches on the top when I set up at a camp ground and it worked fine. It worked that way until I sold it several years later.
Don & Bev Morgan Weyauwega WI, 05 Itasca Horizon 40KD, 400 HP Cummins, Delorme GPS LT 40, Toad 07 Saturn Vue AWD, Air Force One, TST 510 TPMS, Mayor of Weyauwega 2007 - 2013, Waupaca Co Board Supervisor 2010 - 2014