Main Gas Valve - Navien NPE-180A Service Manual

4.11.8 Main Gas Valve

Part
1. To control the amount of gas supplied to the burner based on fan speed.
Function
2. When the unit experiences abnormal combustion, it shuts off the gas valve automatically and prevents
unsafe situations.
Failure Event Unable to open/close
1. No flames.
Effects
2. No operation of the unit.
Error Code E003, E012
1. Visual inspection: Connection and/or breakage of wires.
Diagnostic
2. Voltage check: Check range of voltage shown below.
RED-YELLOW: DC 22~24 V
Color/Number
●
of wires
WHITE-RED: DC 22~24 V
●
Check Point
Test P with
out
manometer for
specified pressure
range to ensure
that the Gas Valve is
operating properly.
System Details 65