Navien NP-180 Service Manual page 76

Other trouble
Defective PCB
Mainfold disassembly procedure
1. Remove 4 screws and remove the ignition transformer
and the venture
3. Remove 2 manifold fixing screws.
6. Disassemble the manifold.
©Navien America Inc. 2010
To the direction of
air supply hose
< Example of flue installation >
If the trouble continues despite the checking of above items,
replace the PCB.
2. Remove 6 screws (2 under and 4 upper).
4. Remove multi-stage
valve.
Stage 2 Stage 1
74
NR/NP series service Manual
Air supply pipe
5. Use a screw driver to remove
the valve.
Stage 3
7. Check the nozzles.
Version 2.0