Navien NP-180, Service Manual

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4.6.15. Flow Sensor
Navien Part No.
Function
Failure Event
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
Effects
Error Code
Diagnostic
AASS9EXFS003 Check Point F
Color /
Number of wires
Flow Rate Range
Maximum Pressure
0.5 ~8.0 GPM
150 psi