The Front Panel; Lcd Display - Navien NHB-055 Service Manual

4.4 The Front Panel

The front panel allows you to adjust the temperature and view the operating status or error codes. Remove the protective sheet from the front
panel before using it.

4.4.1 LCD Display

DISPLAY (Icon)
Heating
Hot Water
S
Supply water Control
R
Return Water Control
Segment
Combustion
Check-up (Error)
O/R
Outdoor Reset
GPM
GPM
psi
Psi
Version 1.0
Displays Heating icon upon heating demand (Space Heating mode)
Displays Hot Water icon upon hot water demand (DHW setting mode)
Displays the Supply Water Control mode status
Displays the Return Water Control mode status
Displays the data set in each Segment according to display status
Displays the Combustion status. Flashes the Combustion icon at 1 second
intervals when performing combustion freeze protection
Displays the Error icon when an error occurs. The Boiler may still maintain
basic operations (temperature settings, etc.) if it displays the error icon only.
Displays the Outdoor Reset function status
Displays the system flow rate (in GPM)
Displays the system water pressure (in psi)
Function Remarks
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