Originally Posted by Jwatty
Ok, I've read the manual countless times but can't figure it out....how do you know if it's on auto or not??
I don't know about your manual but the answer is at least implied in post #7 and matches fact on my trailer. I don't know if yours is the same.
Use the mode button (or whatever it's called on your thermostat) to set the unit to Fan... not Cool or Heat. Then use + on the right to cycle through Hi, Lo, Auto.
If that doesn't work, your thermostat is not like mine.
Ford Idaho beat me to it!