Navien NPE-240A Service Manual

Troubleshooting 93
5.1.6 046Error
Error occurrence conditions and check items
Replace heat exchanger
thermistor.
Check connector
( #1 and #2 of CON 6)
1 step: Flushing, Clean Filter
2 step: Try to restart
3 step: Replace PCB
Yes
Yes
Is heat exchanger
thermistor normally
operating?
Is resistance
within normal range?
(refer to page 59)
NO
NO
5.1.7 047Error
Error occurrence conditions and check items
Check connector
(#9 and #10 of CON6)
Replace exhaust thermistor
Resistance between #9 and #10 of CON6 is from 2kΩ
to 300kΩ at normal condition. (see page 52 for
Wiring Diagram)
NO
Is exhaust thermistor
operating normally?
Yes

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