A.O. Smith 400A - Manual (Page 24)

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7. Viewing the Fault History
The controller for this water heater will store a history of ten of the last Fault and Warning conditions that occurred. This is stored in the
Fault History. Along with all the information about the fault, including a estimate time of when the fault occurred, information regarding
the advanced diagnostics for that fault can be accessed at any time.
8. Viewing Information About the Heater
The electronic control for this water heater monitors many different aspects of the water to ensure safe and optimal operation. Much
of the information monitored is available to view in two areas of the control. The first is the "Heater Status" and; the second is "Heater
Information". These items can be selected through the main menu in the same fashion as described above. In these menus, detailed
information about the water heater and the current status of specific conditions can be found.