Water Pressure Sensor - Navien NCB-180 Service Manual

4.9.16 Water Pressure Sensor

Part
Function
Failure Event
Effects
Error Code
Diagnostic
Color/Number of wires
They are suitable for analyzing water pressure ratios in heating.
Unable to detect or measure to change water pressure
Water filling system does not operate automatically
E351, E352, E353
1. Visual inspection: check the circulation pump connection wire.
2. Voltage check: Check range of voltage shown below.
Black-Red : DC 0~5V
Check Point
Legend to cross-section drawing
1. Pressure connection
2. Ceramic sensor
3. Amplifier electronics
4. Cover
5. Electrical connection (RAST 2.5)