Error Occurrence History Display - Navien NCB-180 Service Manual

4.4.9 Error occurrence history display

1. At the <Normal operation mode> or <Error history display
mode>, press the [Info] button for over 2 seconds to access
the error history mode.
The most recent error will be displayed first.
2. When the [+] / [-] button is pressed, the error history can be
searched. A total of 10 errors are stored in memory and are
labeled from 0 to 9 with 0 being the most recent error.
3. Whenever the [Info] button is pressed, the previous error
occurrence time difference (unit time, maximum 9999 hr)
and the sub error code are toggled and displayed.
4. Pressing the [Reset] button for 5 seconds while in the
<ERROR HISTORY DISPLAY MODE> displays "CLR" and
deletes all the ERROR HISTORY DATA.
5. Press the [Reset] button once to return to the <Normal
operation mode>.
6. If there is no button input for 5 minutes, then it
automatically returns to the <Normal operation mode>.
NOTE
 While in <ERROR HISTORY DISPLAY MODE> the first
digit indicates the history of the error with 0 being the
most recent. The remaining 3 digits indicate the error
code. If there is no error history, a "0" will be
displayed.
 Passed time display: The time between the currently
displayed error and the just previously generated error
is displayed in 1-hr unit.
 ("0" is displayed if the error code is empty)
 Ex) When 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" (i.e., there is no sub
error code), the display is as follows: