Navien NCB-24LSWE, Service Manual

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NCB Service Manual 39 Version 1.0
4.4.9 Displaying Error History
1. In <Normal operation mode> or <Error history
mode>, press [ECO] and [Space Heating] for > 2
seconds to access the error history mode. The most
recent error will be displayed first.
2. Press [+] or [-] to search for the error. A total of 10
errors are stored in memory and are labelled from 0 to
9 with 0 being the most recent error.
3. Each time [ECO] is pressed, the previous errors’
duration (maximum time 9,999 hours) and the sub
error code is sequentially displayed.
4. Press [Reset] for 5 seconds while in the <Error history
mode>, when “CLR” is displayed all of the error history
is deleted.
5. Press [Reset] again to return to <Normal operation
mode>.
6. If no buttons are pressed for 5 minutes, the system
automatically returns to <Normal operation mode>.
NOTE

In <Error history mode>, the first
digit indicates the order of the
record in the history with “0” the
most recent. The remaining three
digits indicate the error code. If
there is no error history, “0” will be
displayed.

Expired time display: The time
between the currently displayed
error and the previously generated
error is displayed in one hour units.

Eg.) If the most recent error code is
615, the sub error code is 5, and 24
hours have passed since the error
was generated.

When the sub error code is “0” ,
there is no sub error code displayed