Furnace problem

Thanks for all the replies. Turns out that the control circuit board is defective. I checked connections, voltage, air flow blockages, etc. While I had the outside cover off to check connections, there was a troubleshooting chart for the diagnostic LED on the circuit board. I turned the unit on, observed the LED during the fault condition and communicated the results to Camping World where we bought the 5er. They are going to order a new board based on my word and will install it the next time I am in the area, as they are 100 miles away. Looks like we are on the road to recovery. It helps to be thorough in your data gathering to gain credibility with the dealer to resolve issues over the phone instead of travelling to their location each time. Thanks again for the ideas that helped get me to the source of the problem.