Hi Don - Read your problems regarding the furnace with great interest. We haven't used our 19' all that much (yet) but, this past Christmas, while our kids were staying in the trailer, the furnace (which had been running for about 6 hours without problems) suddenly went out. The fan continued to run but they couldn't get the furnace to light for anything. We went up the next day and tried lighting the furnace and it fired right up; however, we need to take it out and give it a real test. Your issue sounds exactly like what they experienced .... and they're experienced RV campers so understand the ins and outs of the furnace. Will need to check it out but at least now we know what to look for ....