Happened to me as well.
Behind the battery in my 5th wheel were 3 green 30 amp fuses.
Change all three with 30 amp auto-reset fuses from the car store (AutoZone or whatever).
The other two were for the main slides.
Initially I just changed the landing dear fuse, but after I had to remove the battery box a second time to change a slide fuse that popped when ice formed around the seal, I did them all.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW