I found these two bits of info regarding the fault codes on your inverter. As to the #19 light on the Vansco, when lit, it indicates that the battery inter-tie solenoid (Trombetta) is closed and the charger is charging both battery banks. It will not illuminate if the charger is not functioning properly.
The fault code indicates that the charger is overheating. It could be an issue with the charger itself, the batteries, cable connections, etc. If the fault continues to occur after following the reset procedure, you’ll need to determine what is causing the fault.