It sounds as if at least part of your problem is with your converter. Mine (36D) is located under the drawers in the kitchen, mounted to the floor.
The charging of house batteries and chassis batteries is handled by the converter, which passes power to the battery control unit, which charges both battery functions, house and coach.
Sounds like there may be a couple of things going on. Are you certain you have power coming into the system? My breaker panel under my bathroom sink has a 50amp main breaker in the center. Should have 3 connections...2 black and 1 white. You should be able to measure with a voltmeter set to AC, 120v from either black wire to the center white wire.
The converter is also on a GFI-protected plug/circuit in my 36D, so if the GFI gets tripped, it will shut the converted down and all of your batteries will eventually drain.
The only time I've seen "no power" on my Energy System control panel was when I had a loose neutral connection in that same breaker panel under the bathroom sink that the main 50amp breaker is in.
Let me know what you find...or if you have any questions about anything I've posted here in the reply.
Jimb
2005 Pace Arrow 36D
Very Understanding Wife
1 Boxer ๐
3 Maine Coon cats