The elevator was shutting down on various floors before I set it to park at the lobby. Yes, I know how to access the shutdown codes without the tool, are their faults that can be accessed without the tool as well? The unit is set to park at the lobby which is approx. midway in the hoistway. Any idea why I get NAV without a hard fault? If I press S1 the unit will reset, without going through the entire reset procedure, also cycling power resets the unit.