Navien NHB-150 Service Manual

100 NHB Service Manual
Version 1.0
5.2.7 046Error
Error occurrence conditions and check items
Is heat exchanger
thermistor normally
operating?
Is resistance within
normal range?
(refer to page 67)
Replace heat exchanger
thermistor.
Check connector
( #7 and #8 of CN 13)
1 step: Flushing, Clean Filter
2 step: Try to restart
3 step: Replace PCB
Yes
Yes
No
No
5.2.8 047Error
Error occurrence conditions and check items
Is exhaust thermistor
operating normally?
Check connector
(#1 and #2 of CN13)
Replace exhaust thermistor
Resistance between #9 and #10 of CN13
is from 2kΩ to 300kΩ at normal condition.
(see page 63-64 for Wiring Diagram)
No
Yes

Navien NHB-150 Specifications

General

Model	NHB-150
Category	Boiler
Maximum Input	150, 000 BTU/h
AFUE	95%
Vent Type	Direct Vent
Fuel Type	Natural Gas or Propane
Min. Input (NG)	15, 000 BTU/h
Min. Input (LP)	15, 000 BTU/h
Voltage	120 V
Water Connection Size	1 inch NPT
Gas Connection Size	3/4 inch NPT
Vent Diameter	3"