We ran into a problem with our 2014 Southwind a couple of weeks ago with the blower motor on the chassis blower not working.
It meant no heat being blown out of the dash vents in below freezing temps.
I searched all documents and checked every possible fuse, and found all in good shape.
We then went to level the coach and the Power Gear levelling touch pad wouldn't work!
After another intensive search and nothing, we called in a mobile RV service guy.
Eventually he traced the problem to a blown 25 amp in-line fuse tucked up high behind the speedometer!
We also determined that the 1-25 amp fuse was handling both the Blower and Levellers.
Posting this as an FYI should you find yourself with a similar issue.