Flow Sensor - Navien NP-180 Service Manual

4.6.15. Flow Sensor

Navien Part No.
Function
Failure Event
Effects
Error Code
Diagnostic
Color /
Number of wires
©Navien America Inc. 2010
AASS9EXFS003
1. To sensing water flow and GPM (Gallons per minute) for steady
hot water temperature.
1. Unable to detect or measure any water flow rate.
2. Water leakage from the water flow sensor.
1. Ignition sequence does not start.
2. Stop operating once detecting water leakage.
E039
1. Visual inspection: Connection and/or breakage of wires.
2. Voltage check: Check range of voltage shown below.
1. Red- black : DC 5 V
2. White – black : DC 0.3 ~ 4.5 V
Flow Rate Range
Maximum Pressure
57
NR/NP series service Manual
Check Point
0.5 ~8.0 GPM
150 psi
F
Version 2.0