Navien NPE-240A Service Manual

Troubleshooting 115
5.1.22 594Error
Error occurrence conditions and check items
Error Description
E594 error If the communication is abnormal in parts of PCB, the system displays E594 on the PCB.
Check items
1. Check the PCB.
Check method
Fault Possible Causes Check method
E594 Error
Abnormal
communication by
PCB.
1. Click the Reset button on Front panel.
2. Turn the POWER to the unit OFF then ON. Disconnect then reconnect power if
necessary.
3. If the system still displays E594, replace the main PCB.
5.1.23 615Error
Error occurrence conditions and check items
Error Description
E615 error Abnormal signal input by PCB.
Check items
1. Turn the POWER RESET switch OFF then ON (or unplug and replug the power supply.
2. If the system still displays E615, replace the main 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