2010 kz 5th wheel. suburban, probably sf model? Did it work Friday evening, then failed sat am?. Dry camping? Then try with a generator to charge battery as low battery will not allow heat to operate. Does fan run approx. 30 seconds then fan shuts off, sail switch or limit switch, if so most likely limit switch , access from within rv behind 8" x 17" removable metal plate with 2 screws. Outside removable service door you can get to board and sail. If only exterior 2 hole grill then r & r furnace required to access any components except limit.