Navien CH-180, Service Manual, Page: 140 / 155

© Navien Ameri c a I n c . 20 1 0 CH series servi c e Manua l Version 1 .0
8.2.19. Domestic Hot Water Outlet Collar
1. Turn off the gas supply.
2. Turn off the 120V power supply.
3. Turn off the water supply. Drain all
water from the appliance.
4. Remove the four screws securing
the front panel. Remove front panel.
5. Pull out the PCB. (refer to 8.2.1
PCB)
6. Pull out the flow sensor. (refer to
8.2.12 Flow Sensor.)
7. Remove the stainless clip. (fastener
“A”)
8. Loosen the domestic hot water outlet
adaptor 2 screw from bottom base.
9. Pull out the domestic hot water outlet
collar.
10. Replace with new domestic hot
water outlet collar secured it.
11. Tighten the domestic hot water
outlet adaptor 2 screw from bottom
base.
12. Replace the stainless clip. (fastener
“A”)
13. Replace the flow sensor. (refer to
8.2.12 Flow Sensor)
14. Replace the PCB. (refer to 8.2.1
PCB)
16. Install front panel using 4(four)
screws.
17. Turn on water supply, power
supply, and gas supply.
18. Open a hot water tap and ensure
there are no leaks at the boiler.
138
Figure 53
Figure 51
Figure 52