Version Display; Error Code - Navien NHB-055 Service Manual

4.5 Version Display

Press the [Diagnostic] button for more than 10 seconds at <Power Off mode> will display the Main Controller firmware version for 3 seconds,
display the Panel firmware version for 3 seconds and return the system to <Power Off mode>.
Item
(a) Main Controller F / W Version
(b) Panel F / W Version

4.6 Error Code

Item
(a) Panel Communication Error
(b) Key Error
Version 1.0
Description
Displays for 3 seconds
Ex > Ver 1.2
Displays for 3 seconds
Ex > Ver 2.3
Error Code
E782
(Level 1)
E593
(Level 1)
Display
Conditions
Automatically releases the error code when the main
controller doesn't answer for 60 seconds but the system
operates normal communications once.
The error code will be displayed first on the Panel
Controller regardless of error level when a Panel
Communications Error occurs (as it is not possible to know
the Controller error status if communication with the
Controller is not available)
A Key Error occurs when Touch IC IIC Communication is not
available for more than 1 minute and will be automatically
released when normal operating conditions are met.
NHB Service Manual 61