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4

STEP 3  After Installing

  Opening All the Valves

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Gas Valve

Space Heating System Valves

Shut-off 

valves

Power ON

Adjust Temperatures

View Basic Information

Resetting the Boiler

Space Heating Temperature

DHW Temperature
1.  In normal operation mode, rotate 

the Command dial ( ). The space 

heating temperature ( ) is 

highlighted on the screen.

2.  Rotate the Command dial ( ) to 

the right to select the DHW 

temperature.

3.  Press the Command dial ( ) to 

select the indirect DHW 

temperature ( ). The highlighted 

section will flash.

4.  Rotate the Command dial ( )

 

to 

the right or left to increase or 

decrease the temperature.

5.  Press the Command dial ( ) to 

confirm the new temperature.

Note

DHW temperature higher 

than 180 °F can cause 

scalding.

When the power is on, the boiler 

automatically enters normal 

operation mode, and the boiler’s 

operating conditions are diaplayed 

on the screen.

1.  In normal operation mode, rotate the 

Command dial ( ). The space 

heating temperature ( ) is 

highlighted on the screen.

2.  Press the Command dial ( )

 

to select 

the space heating temperature. The 

highlighted section will flash.

3.  Rotate the Command dial ( )

 

to the 

right or left to increase or decrease 

the temperature.

4.  Press the Command dial ( )

 

to 

confirm the new temperature.

1.  Press the Menu button ( ), and 

then select “2. Status 

Information”.

2.  Rotate the Command dial (

to 

switch between the information 

items.

If an error message appears during 

boiler operation, reset the boiler to 

resolve the problem. Press the Back 

button (

) on the front panel to 

reset the boiler.

Note

If resetting does not 

solve the problem, refer 

to the troubleshooting 

section of the User’s 

Information Manual or 

contact the service 

center.

1

Open

Closed

2

Open a hot water 

faucet. The boiler 

should turn on and 

the gas in the gas 

supply line will be 

purged.

2

3

3

4

Shut off the manual gas valve.

Leave the faucet on until the boiler shuts down 

due to a lack of gas supply, and then turn off the 

hot water faucet.

Remove the front cover by 

loosening the 4 screws.

Loosen the screw indicated in the figure and 

connect a manometer to the pressure port. 

Reset the manometer to zero before use.

5

Open

Re-open the manual 

gas valve and check 

for leaks.

Open multiple 

fixtures that have 

high flow rates, such 

as bathtub and 

shower faucets, to 

ramp the boiler up to 

its maximum firing 

rate.

6

NG: 3.5”–10.5” WC 

LP: 8.0”–13.5” WC

Recommended  

Gas Pressure Settings:

          Check the inlet gas pressure reading on the manometer.

If not,

Gas supply

Adjust the inlet gas pressure with gas 

regulator.

 CAUTION

The boiler cannot function properly without sufficient inlet gas pressure. 

Measuring the inlet gas pressure should be performed by a licensed professional only.

Navien, Inc. 

20 Goodyear, Irvine, CA 92618 

Tel: 1-800-519-8794, Fax: 1-949-420-0430 

www.navien.com

  Installing the Front Cover

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  Ensure Maximum Water Flow

 >

 

After running the boiler for the first 10 minutes, turn it off and clean the cold water filter 

and the space heating return strainer to remove any trapped debris.

  Final Check

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A trial run should be performed in accordance with the Installation checklist listed in 

the boiler’s Installation & Operation Manual.

  Operating the Boiler

  

>

  

  Measuring the Inlet Gas Pressure

  

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