1995 Winnebago Vectra - How in the heck does the heat work??

Thank you, Doug! I have scoured YouTube and online forums for something related to this heater/furnace and found nothing. This was so helpful. Thanks again!

Also, my water heater and stove spark right up, no problem. I just don't know why the heater is so hard. The one time I got it going, it worked great all evening but it stopped working in the middle of the night and I woke up to a balmy 54 degrees in my coach the next morning.