Navien CH-180, Service Manual, Page: 127 / 155

© Navien Ameri c a I n c . 20 1 0 CH series servi c e Manua l 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.
1 2 5
Figure 15
Figure 16
Figure 17
NOTE
As reassemble the air pressure
sensor, careful with right size and
direction.