Navien NP-180 Service Manual page 73

< Electrode gap 3~4mm >
No spark from
electrode
Ignition fail
Main Gas Valve
©Navien America Inc. 2010
< Electrode gap error >
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 combustion room.
Add the insulating packing to the insulator of the electrode.
Check the input power to the ignition transformer (AC 102 ~ 132 V).
If there is no trouble in the input power to the ignition transformer,
replace the ignition transformer.
Replace the PCB if there is a trouble in the power supply to
the ignition transformer.
Check the insulator boots on spark wires for cracks/holes
<Ignition transformer>
Check the primary/secondary power supply to the gas control valve.
Check, with a tester, if the input power is DC 83~120 V.
Replace the PCB if power is not supplied.
If power supply is normal, check if the coil is open.
Check if the solenoid valve works properly.
Feel or hear a click.
71
NR/NP series service Manual
<Flame detection rod gap 10~15mm>
<Ignition transformer line: Blue,
Terminal: Brown>
Version 2.0