Secondary Heat Exchanger - Navien NPE-180A Service Manual

4.11.13 Secondary Heat Exchanger

Part
1. Main part for heat transfer from the burner.
Function
2. There are multiple paths of water pipes on the heat exchanger as well as inside the combustion chamber
1. Water and/or exhaust gas leakage through a crack.
Failure Event
2. Improper heat transfer can cause the water in heat exchanger to boil.
1. Exhaust gas leakage.
Effects
2. Excessive heating of the water that produces boiling noises.
Error Code E016, E030, E047
1. Visual inspection: Check if there is a crack on the surface of heat exchanger.
Diagnostic
2. Sound inspection: Check if boiling occurs.
Color/Number
of wires
70 NPE Service Manual
which minimizes heat loss.
Check Point
N/A
Version 2.21