Navien NCB-180, Service Manual

Page: 56 / 149

Component Test Performed Display Method
Fan
Gradually increase / decrease the speed
of the fan motor starting from 0 RPM to
full speed and back down to 0 RPM
The current APS value and the current RPM value are
repeatedly displayed at intervals of 2 seconds.
Pump
Cycles the pump 10 seconds ON and 5
seconds OFF five times. (Repeats five
times for a total of 75 seconds)
Displays On or Off according to pump status
3-Way
Valve
3-Way Valve will be turned On upon
entering <Test mode> and pressing the
[+], [-] button each time converts the
state from On -> Off or Off -> On
Whenever the [+], [-] button is pressed, the condition is
toggled as On -> Off or Off -> On
Dual
Venturi
Dual Venturi will be turned On upon
entering <Test mode> and pressing the
[+], [-] button each time converts the
state from On -> Off or Off -> On
Whenever the [+], [-] button is pressed, the condition is
toggled as On -> Off or Off -> On
※
Error Check Operation will return to Normal Operation condition after automatic test when selecting each operation mode (3-
Way Valve and Dual Venturi will be manually controlled)