Navien NPE-180A Service Manual page 80

Failure mode Cause
No spark from
Ignition failure
electrode
Electrode gap 3.5~4.5mm(1/8")
When no spark is made from the electrode at ignition:
Remove the electrode and check if there is a crack on the insulator.
●
Adjust the gap if there is a discharge of electricity from the metallic part of the
●
burner.
Ensure that the insulating gasket is installed between the electrode and burner
●
casing.
Check the input power to the ignition transformer (AC 102 ~ 132 V).
●
If there is sufficient power to the ignition transformer, replace the ignition
●
transformer.
Replace the PCB if there is no power or insufficient power supplied to the ignition
●
transformer.
Check the insulator boots on the spark wires for cracks/holes.
●
Ignition transformer
Check method
Electrode gap error
Troubleshooting 79