Navien NCB-24LSWE, Service Manual

Page: 56 / 144

54 NCB Service Manual Version 1.0
Component Test performed Display
Fan motor
Gradually increases the fan motor
speed from 0 rpm to full speed and
then decreases the speed to 0 rpm.
The current APS value and the current speed (rpm) are
displayed alternately at two second intervals.
Pump
Turns ON the pump for 10 sec and
then OFF for 5 sec. The cycle is
repeated five times for a total of 75
sec.
Displays ON or OFF based on the pump’s status.
3-way valve
Turn ON the 3-way valve when the
test mode opens. By pressing [+] or
[-] converts the valve’s state from
On -> Off or Off -> On.
When [+] or [-] is pressed, the condition toggles from On ->
Off or Off -> On.
Dual
venturi
Turn ON the dual venturi when the
test mode opens. By pressing [+] or
[-] converts the component’s state
from On -> Off or Off -> On.
When [+] or [-] is pressed, the condition toggles from On ->
Off or Off -> On.

<Error checking mode> returns to <Normal operation mode> after the automatic test is completed.