Navien CH-180, Service Manual, Page: 53 / 155

51
4.6.19. 3-Way Valve
Navien Part No.
Function
Check Point AAVC9EX00009 M
Failure Event
1. No hot water in space heating mode.
2. No domestic hot water in DHW mode.
Effects
Error Code
E01, E16
Diagnostic
Color /
Number of wires
Blue-Black : ON AC 97 ~ 138 V, OFF 0 V
ö Confirm voltage as the 3-Way Valve operating
Diverts the water from the space heating system to the DHW plate heat
exchanger and back based on input from DHW flow sensor and PCB.
In the case that the temperature of space heating is lower than the set
temperature, it blocks the water flow path for domestic hot water so that
heating water can flow through space heating pipes.
1. Visual inspection: check the 3-Way Valve connection wire.
2. Voltage check: Check range of voltage shown below.
© Navien Ameri c a I n c . 20 1 0 CH series servi c e Manua l Version 1 .0