Way Valve - Navien NCB-24LSWE Service Manual

4.9.15 3 Way Valve

Item
Function
Fault
Symptoms
Error codes
Diagnostics
Testing/inspection
information
74 NCB Service Manual
Uses a DHW flow sensor and PCB to cycle water between the space heating system and the DHW
heat exchanger.
1. No hot water in space heating mode.
2. No domestic hot water in DHW mode.
DHW supply stops and flow continues in the space heating system when the space heating water
temperature is lower than the set point.
E016
1. Visual inspection: Check the 3-way valve wiring connections.
2. Voltage test: Test the voltage meets the specifications shown below.
SPACE HEATING: RED + WHITE: ON AC 230 V, OFF 0 V
DHW: RED + PURPLE: ON AC 230 V, OFF 0 V
Confirm voltage as the 3-Way Valve operating
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Description
Version 1.0