Turning The Boiler On Or Off; Normal Operation - Navien NCB-180 Service Manual

4.4.3 Turning the Boiler On or Off

To turn the boiler on or off, press the [Power] button.
If the unit is experiencing an error the error code will continue
to display on the front panel even if the unit is turned OFF.
Item Description
Normal
Operating
Power
mode with
ON
Power
turned On
Off status
Power
with power
OFF
Off
Display
When the temperature of the
present supply water is 120℉
and the water pressure is 12.3psi
(Fahrenheit specification)
5 sec flashing
When the temperature of the
present supply water is 60.0℃
and its water pressure is 12.3psi
(Celsius specification)
5 sec flashing
All displays off except status
icons (the status icon is shown
normally according to function
status)
※ When the power is first applied, please turn the panel
segments and icons on for 3 seconds (in order to check LCD
defect)
※ The firmware version of panel will be displayed for 2
seconds after 3 seconds from power application
NOTE
If the Air purge is operating, the Segment repeats to display
'AIR' for 5 seconds and water pressure for 5 seconds.
When displaying the water temperature of the space heating
supply, the supply or return water icon flashes, depending on
the space heating control mode

4.4.4 Normal Operation

1. Enter <Normal Operating mode> pressing the [Power]
button for more than 300ms at Power Off mode>
2. The Boiler will display the temperature and pressure of
present supply water at 5 second intervals.
3. The Segment repeats to display 'AIR' for 5 seconds and
water pressure for 5 seconds while Air Purge is in operation
4. When displaying the temperature of present supply water
(for 5 seconds) , the Supply water Control and Return
Water Control icons flash according to the Heating Control
mode.
5. The Psi icon flashes when displaying the water pressure
(for 5 seconds)
6. The Error icon flashes at 1 second intervals when a Level 1
error occurs.
7. Pressing the [+] or [-] button briefly when a Level 1 error
occurs will convert the Boiler to <Level 1 Error Display
mode>. <Level 1 Error Display mode> displays the error
code and returns to <Normal Operating mode> after 5
seconds. When the error is released during <Level 1 Error
Display mode>, the Boiler will convert to <Normal
Operating mode>. However, the Boiler will not accept any
input from the button during <Level 1 Error Display
mode>.
8. For a Level 1 error, pressing Auto Release or [Reset] button
once will release the error after displaying 'RST' for 3
seconds, if the Boiler meets the conditions to release the
error.
9. The Boiler operates normally during a Level 1 error.
10. Entering <Error History mode> is available via <Normal
Operating mode>.