It's a puzzle for sure...
If you can't find a decent RV dealer that understands this stuff, maybe a marine dealer that knows the Balmar stuff inside and out.
Other option, call Balmar and or Mastervolt, if you get the right people they will trouble shoot with you.
I'm with you, I'm thinking Balmar...evidence - UHG blew up, display doesn't make sense. There are only 3 other components, other than the UHG...display, shunt, regulator. Did you compare the params I posted. Those are the factory config for a 200ah battery setup.
Problem's like this are hard to figure out, swapping parts would help.
Without parts, a couple of other things you could try, swap the plugs on the shunt - long shot, look for anything loose - pull on any of the butt splices. Pull/Replace the fuse to the shunt (I think its either 5 or 2 amp..dont remember), it comes off the back of the master 12v disconnect switch. Check the plug on the display, I'd reseat the plug.
Good luck
Ron
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Ron and Kitchy with Scottie our tri-color Sheltie
2014 Fleetwood Bounder 35k, 2019 Jeep Cherokee Limited toad
2023 Thor Tellaro 20L 200Amp Reliable -no generator
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