Navien CH-180 Service manual - page 51

49

4.6.17. DHW Heat Exchanger 

Navien Part No.

Function

Check Point

PAS40KHE_003(210/240)

PAS30KHE_005(180)

PAS4DKHE_004(240 ASME)

N/A

Failure Event

Effects

Error Code

E001, E016, E030

Diagnostic

Color /

Number of wires

Water heated in the primary/secondary heat exchanger is circulated to the 

plate heat exchanger, where the heat of heating water and tap water are 

exchanged so that hot water is available. 

1. Water leakage through a crack.

2. Improper heat transfer can cause the cold water in heat exchanger.

The plate heat exchanger filters out impurities in space heating pipes to 

prevent heating problems caused by impurities.

Leak in plate heat exchanger will cause pressure in space heating side to 

increase to tap water pressure level.

N/A

1. The unit will stop operating once detecting water leakage.

2. DHW does not come out.

©Navien America Inc. 2010

CH  series service Manual

Version 1.0