Navien NPE-240A Service Manual

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

Navien NPE-240A Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Energy Factor	0.97
Energy Efficiency	97%
Voltage	120V
Ignition Type	Electronic
Maximum Input	199, 900 BTU/h
Water Connection Size	3/4"
Gas Connection Size	3/4"
Warranty	15-year on heat exchangers, 5-year on parts, 1-year on labor
Dimensions	17.3" W x 13.2" D x 27.4" H