Navien NHB-055 Service Manual page 58

Component
Fan
Boiler Pump
System Pump
Hot Water Pump
Dual Venturi
* Error Check Operation will return to Normal Operation condition after automatic test when selecting each operation mode (Boiler Pump, System Pump, Hot
Water Pump and Dual Venturi will be manually controlled)
58 NHB Service Manual
Test Performed
Gradually increase / decrease the speed of
the fan motor starting from 0 RPM to full
speed and back down to 0 RPM
Cycles the pump 10 seconds ON and 5
seconds OFF five times. (Repeats five times
for a total of 75 seconds)
In entering Test, it becomes System Pump
On status and whenever[+], [-] buttons are
pressed, the status changes to On -> Off or
Off -> On
In entering Test, it becomes Pump On status
and whenever[+], [-] buttons are pressed, the
status changes to On -> Off or Off -> On
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
Display Method
The current APS value and the current RPM value are repeatedly
displayed at intervals of 2 seconds.
Whenever the [+], [-] button is pressed, the condition is toggled as
On -> Off or Off -> On
Whenever the [+], [-] button is pressed, the condition is toggled as
On -> Off or Off -> On
Whenever the [+], [-] button is pressed, the condition is toggled as
On -> Off or Off -> On
Whenever the [+], [-] button is pressed, the condition is toggled as
On -> Off or Off -> On
Version 1.0