Navien NCB-180, Service Manual

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4.9.6 Ignition Transformer
Part Check Point
Function
To ignite gas by repeatedly discharging a high voltage spark to the main burner 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: Connection and/or breakage of wires.
2. Voltage check: Check range of voltage shown below.
Color/Number of wires
Blue

On : AC 97 ~ 138 V

Off : 0 V
Input Voltage Output Voltage Output Current
120 V, 60 Hz
20 KV
±
10mA
±
2mA