I have always been afraid of messing with those switches other than to trip all 3 off. Well today, even with the door open the air was stagnant and getting smokie. So, I decided to shutdown 2 of the switches. I just figured out that they control the heat coils.
The fan kicked on. Here's the cool part, a pun. My trailer is 3 feet off the ground. It's very cool under there. The heating ducts hit all the rooms in my tariler. In the summer it gets nasty humid hot. I just discovered I have Air Conditioning on those reallly nasty days.:ROTF: AH, trailer living.
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