Navien NHB-055, Service Manual

Page: 31 / 147

NHB Service Manual 31 Version 1.0
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) Function Remarks
Displays Heating icon upon heating demand (Space Heating mode)
Heating
Displays Hot Water icon upon hot water demand (DHW setting mode)
Hot Water
S
Displays the Supply Water Control mode status
Supply water Control
R
Displays the Return Water Control mode status
Return Water Control
Displays the data set in each Segment according to display status
Segment
Displays the Combustion status. Flashes the Combustion icon at 1 second
intervals when performing combustion freeze protection
Combustion
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.
Check-up (Error)
O/R
Displays the Outdoor Reset function status
Outdoor Reset
GPM
Displays the system flow rate (in GPM)
GPM
psi
Displays the system water pressure (in psi)
Psi