Navien NPE-240A Service Manual

Version 2.21
86 NPE Service Manual
Fault
Possible
Causes
Check method
Flame loss and noise
occurs after ignition
Model Gas Type Offset
NPE-150S
NG -0.04"±0.01"
LP -0.03"±0.01"
NPE-180A
NPE-180S
NG -0.04"±0.01"
LP -0.03"±0.01"
NPE-210A
NPE-210S
NG -0.04"±0.01"
LP -0.02"±0.01"
NPE-240A
NPE-240S
NG -0.04"±0.01"
LP -0.02"±0.01"
Check the offset values for low fire Offset value for low fire
Flame Rod
(Electrode)
Replace the electrode or clean the fire detecting electrode.
-
Cause: Due to the properties of the electrode, the oxide film is created due to
long-term exposure to the high temperature; therefore, errors may be caused in
detecting the fires.
-
Check-up: Use sandpaper to clean the fire detecting electrode covered with oxide
film or replace it.

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