Navien CH-180 Service manual - page 50

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4.6.16. Secondary Heat Exchanger

Navien Part No.

Function

Check Point

N/A

N/A

Failure Event

1. Water and/or exhaust gas leakage through a crack.

2. Improper heat transfer can cause the water in heat exchanger to boil.

Effects

Error Code

E001, E016, E030, E037

Diagnostic

Color /

Number of wires

N/A

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. The unit will stop operating once detecting water leakage.

2. Exhaust gas leakage.

3. Make boiling sound.

1. Visual inspection: check if there is a crack on the surface of heat 

    exchanger.

2. Sound inspection: check if there’s boiling noise.

©Navien America Inc. 2010

CH  series service Manual

Version 1.0