Converter working: Suspect list
Disconnect switch (may be marked USE/STORE) in STORE (Disconnected/off)
What battery control center do you have? Some have a pair of 30 amp breakers in the bottom of the box push UP hard to reset
UNPLUG first, and wait for a bit, then push up HARD, you should feel/hear the click, then plug back in.
On my coach when I 'Gas up' (propane) I kill the 12 volt house system.
one time if failed to re-engage.. (Bad switch) IF this is the problem Post, it was a no cost fix.
Home is where I park it!