Navien NCB300-28K, Service Manual

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80 Troubleshooting
5.2.15 Error 517
Error occurrence conditions and check items
Are the DIP S/W on the PCB
properly set?
Change the DIP S/W to the proper
settings
* If problem persists, replace the PCB
Reset the unit
Yes
NO
5.2.16 Error 594
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 Check the PCB.
Error occurrence conditions and check items
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.
5.2.17 Error 615
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 then reconnect the power
supply.
2. If the system still displays E615, replace the main PCB.