Water Pressure Sensor - Navien NCB-700-2S+/42K Service Manual

4.7.16 Water Pressure Sensor

Item
Function
Fault
Symptoms
Error codes
Diagnostics
Testing/inspection
information
58 System Details
Analysis of heating system water pressure ratios.
Unable to detect or measure changes of water pressure.
The water top-up system does not operate automatically.
E351, E352, E353
1. Visual inspection: Check the circulation pump's wiring connections.
2. Voltage test: Test the voltage meets the specifications shown below.
Black-Red: DC 0-5 V
Description