Navien CH-180 Service manual - page 127

©Navien America Inc. 2010

CH  series service Manual

Version 1.0

8.2.7. APS

1. Turn off the gas supply

2. Turn off the 120V power supply

3. Turn off the water supply

4. Remove the four screws securing 

    the front panel. Remove front panel.

5. Remove the air pressure sensor  

    connecting housing into the PCB. 

8. Pull out the air pressure sensor.

9. Attach the new air pressure sensor 

   tighten screws.

10. Connect the air pressure sensor 

      tube.

11. Connect the air pressure sensor  

      connecting housing into the PCB.

13. Install front panel using 4(four) 

      bscrews.

14. Turn on water supply, power 

      supply, and gas supply.

6. Remove the air pressure sensor 

    tube into the burner assembly. 

7. Loosen the air pressure sensor low

    erside 2-screw from burner assemble. 

125

Figure 15

Figure 16

Figure 17

NOTE

As reassemble the air pressure 

sensor, careful with right size and 

direction.