Navien NPE-240A Service Manual

Troubleshooting 79
Failure mode Cause Check method
Ignition failure
Electrode gap 3.5~4.5mm(1/8") Electrode gap error
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 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

Navien NPE-240A Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Energy Factor	0.97
Energy Efficiency	97%
Voltage	120V
Ignition Type	Electronic
Maximum Input	199, 900 BTU/h
Water Connection Size	3/4"
Gas Connection Size	3/4"
Warranty	15-year on heat exchangers, 5-year on parts, 1-year on labor
Dimensions	17.3" W x 13.2" D x 27.4" H