Navien NCB-180, Service Manual

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52 NCB Service Manual Version 1.0
(2) Error Checking mode
1. While in <Special Parameter mode>, press the [+] / [-] button and then press the [Mode] button once “2.TST” is displayed on the
front panel.
2. After accessing <Error Checking Mode>, make sure that the boiler is not operating (stop flow)
3. Increase / decrease and change the component check menu item with the [+] / [-] button.
4. For an item not supported by the current model, do not display the item but skip it. (Depending on the DIP SW setting)
5. Press the [Mode] button once to display “WAIT”, execute the component check operation for the relevant item, and return to the
<Troble Check mode> after operation ends. (exdluding the 3-way valve and Dual Venturi Test).
6. During the component check operation, a test is automatically performed without pressing additional buttons (except the 3-Way
Valve and Dual Venturi Test).
7. The 3-Way Valve and Dual Venturi test function is to perform an On / Off manual operation test with the [+], [-] buttons, and if the
[Reset] button is pressed or there is no key input for 5 minutes, then it returns to the “D.VEN” display item.
8. Press the [Reset] button once to return to <Special Parameter mode>. (To the display of the previously entered item “2. TST”
display)
9. If there is no button input for 5 minutes, it automatically returns to the <Special Parameter mode>.
Item Description Display
FAN Motor Fan motor component check menu display
Pump Pump component check menu display
3-Way Valve 3-Way Valve component check menu display
Dual Venturi Dual Venturi component check menu display