Navien NHB-150 Service Manual

70 NHB Service Manual
Version 1.0
4.9.6 Ignition Transformer
Part Check Point
Function Continuously provides a high voltage to flame rod until gas ignites.
Failure Event
1. Unable to ignite during the ignition process.
2. Produces multiple unsuccessful attempts to ignite.
Effects
1. The unit cannot ignite during the ignition process and “E003” or “E004” error codes will display.
2. Durability of the igniter wears down.
Error Code E003, E004
Diagnostic
1. Visual inspection: Check wire connections are secure.
2. Voltage check: Check range of voltage shown below.
Testing/inspection
information
Blue
●
On : AC 97 ~ 138 V
●
Off : 0 V
Input Voltage Output Voltage Output Current
120 V, 60 Hz 20 KV± 10mA±2mA

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"