Turning The Boiler On Or Off; Normal Operation - Navien NCB-150E 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 mode
Power ON
with Power
turned On
Off status with
Power OFF
power Off
MODE
Display
When the temperature of
the present supply water is
120°F and the water pressure
is 12.3psi
(Fahrenheit specification)
5 sec flashing
When the temperature of
the present supply water is
60.0°C 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>.
System Details 35