Navien NHB-055 Service Manual page 57

(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. If [Mode] button is pressed one time at fault identification MENU item, it indicates "WAIT" and performs the fault identifying operation.
5. While performing the fault identification operation of a ventilator, it does not get button input, but automatically returns after completion
of performance.
6. The operation of boiler pump, system pump, warm water pump, Dual Venturi functions is tested by an On / Off manual operation with [+],
[-] buttons and if [Reset] button is pressed or there is no key input for 5 minutes, then it returns to prior menu indicating item.
7. Press the [Reset] button once to return to <Special Parameter mode>. (To the display of the previously entered item "2. TST" display)
8. If there is no button input for 5 minutes, the system automatically returns to the <Special Parameter mode>.
Item
FAN Motor
Boiler Pump
System Pump
Hot Water Pump
Dual Venturi
Version 1.0
Description
Fan motor component check menu display
Boiler Pump component check menu display
System Pump component check menu display
Hot Water Pump component check menu display
Dual Venturi component check menu display
Display
NHB Service Manual 57