Navien NCB-180, Руководство по обслуживанию

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Failure
mode
Cause Check method
Ignition
failure
Ignite gap distance : 3.5~4.5mm (1/8”)
No spark from electrode
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 96 ~ 138 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
Igniter
Flame Rod
Bracket