I'm having the same problem on my 2008 FW Hurricane 34B.  
I ran my house batteries so low I ended up replacing the aged batteries.  No house power.  I start the Gen and about 15 seconds later the house power kicks on.
I called Thor and the service tech told me to look hard under the master bed.  In some other wires is a red 6 gauge going to a two terminal little grey box.  The copper wire terminal will have a reset button.  The silver terminal will not.  The problem is, I still can't find any of this he described.  
I'm hoping the original poster took a pic of what he found to post up for me.
  I'm headed to the rv first thing to look again.  We've got a trip to Blaine Friday for a few days.  We'll be in Vancouver most of the time.