We have a Hughes 50 AMP Autoformer Voltage Regulator. Yesterday the coach power went off in the main living area. AC stayed on in the bedroom however. It seems to be that one leg of the regulator fail...
I agree it's not the autoformer. Remove the autoformer and see if the problem persists. If it does, start the trouble shooting process with the circuit breakers and GFCIs. The circuit breakers on the inverter are hard to spot if you don't know what you're looking for. Usually they are simply small button breakers. Look closely as they are easily overlooked.....Dennis