Navien NPE-240A Service Manual

Version 2.21
106 NPE Service Manual
Check method
Fault Possible Causes Check method
Pump Malfunction
Defective flow sensor
Check the current flow rate displayed on the front panel.
The flow sensor is defective if the water flow displayed is 0.0 gal/min when the pump is
operating or when water is discharged from the hot water tap.
Direct water temperature sensor
Defective pump
Defective pump
1. Check if the pump is working normally.
2. Check the pump power cable connector and verify that the wiring is properly
installed.
3. Check the power supply to the pump (AC 102-132 V).
4. Check for air in the system.
Circulation pump Circulation pump wire: Yellow-White
Other trouble Defective PCB
If the issue continues despite checking the items above, the PCB could be defective.
Replace the PCB.

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