Navien NHB-055, Service Manual

Page: 57 / 147

NHB Service Manual 57 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. 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 Description Display
FAN Motor Fan motor component check menu display
Boiler Pump Boiler Pump component check menu display
System Pump System Pump component check menu display
Hot Water Pump Hot Water Pump component check menu display
Dual Venturi Dual Venturi component check menu display