Need a little help

Thanks for all the reply's, here is what is going on with the furnace. For the first two weeks the furnace worked great until last Saturday evening when it would not work. After upping the temp on the thermostat and no heat or blower I turned the system off for reset, when turned back on the blower will operate for about a minute and then shut off with no heat from floor outlets, tried this several times and still no heat. The stove burners work fine as does the oven. We are running propane from a 500 gal/pound tank like a house would use and there is 35% left in the tank. If I cant get it going tomorrow I will remove the furnace from the 5th wheel and take it back to the dealer for repair.