Error - Navien NCB-700-2S+/42K Service Manual

5.2.21 Error 517

Error occurrence conditions and check items
5.2.22 Error 594
Error occurrence conditions and check items
Error
E594 error
Check items
Error occurrence conditions and check items
Fault
E594 Error
5.2.23 Error 615
Error occurrence conditions and check items
Error
E615 error
Check items
100 Troubleshooting
Are the DIP S/W on the PCB
properly set?
NO
Change the DIP S/W to the proper
settings
If the communication is abnormal in parts of PCB, the system displays E594 on the PCB.
Check the PCB.
Possible Causes
Abnormal
communication by PCB.
Abnormal signal input by PCB.
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.
Yes
* If problem persists, replace the PCB
Description
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.
Description
Reset the unit
Check method