Navien NP-180, Service Manual

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4.6.17. Secondary Heat Exchanger
Navien Part No.
Function
Failure Event
1. Main part for heat transfer from the burner.
2. There is additional path of water pipes on the heat exchanger surface
as well as inside the combustion chamber and it minimizes the heat loss.
1. Water and/or exhaust gas leakage through a crack.
2. Improper heat transfer can cause the water in heat exchanger to boil.
1. The unit will stop operating once detecting water leakage.
2. Exhaust gas leakage.
3. Make boiling sound.
E001, E016, E030, E037
1. Visual inspection: check if there is a crack on the surface of heat exchanger.
2. Sound inspection: check if there’s boiling noise.
N/A
Effects
Error Code
Diagnostic
N/A Check Point N/A
Color /
Number of wires