76 NHB Service Manual
Version 1.0
4.9.12 Water Pressure Sensor
Part
Check Point
Function
Detects water pressure in the heating system.
Failure Event
Unable to detect or measure to change in water pressure.
Effects
Water filling system does not operate automatically
Error Code
E302, E352, E353
Diagnostic
1. Visual inspection: check the circulation pump connection wire.
2. Voltage check: Check range of voltage shown below.
Testing/inspection
information
Black-Red : DC 0~5V
Legend to cross-section drawing
1. Pressure connection
2. Ceramic sensor
3. Amplifier electronics
4. Cover
5. Electrical connection (RAST 2.5)
Summary of Contents for NHB-055
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