Components Replacement Instructions; Pcb - Navien NP-180 Service Manual

8.2. Components Replacement Instructions

8.2.1. PCB

1. Turn off the gas supply
2. Turn off the 120V power supply
3. Turn off the water supply
4. Loosen the PCB right-side screw from
bottom base.
5. Remove the all connecting housing into the
PCB.
< Figure 1 >
6. Loosen the PCB 2 screw from bottom
base.
< Figure 2 >
©Navien America Inc. 2010
7. Loosen the PCB bracket 2 screws
from base.
8. Pull out the PCB.
9. Attach the new PCB tighten screws.
10. Connect the all connecting housing into
the PCB.
11. Install front panel using 4(four) screws.
12. Turn on water supply, power supply,
and gas supply.
13. Perform the measuring
NOTE
Connecting ports must be right color
and place.
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NR/NP series service Manual
< Figure 3 >
Version 2.0