517Error - Navien NCB-180 Service Manual

5.2.20 517Error

Error occurrence conditions and check items
5.2.21 594Error
Error occurrence conditions and check items
Error
If the communication is abnormal in parts of PCB, the system displays E594 on the PCB.
E594 error
Check the PCB.
Check items
Error occurrence conditions and check items
Possible
Fault
Causes
Abnormal
E594 Error communication
by PCB.
5.2.22 615Error
Error occurrence conditions and check items
Error
Abnormal signal input by PCB.
E615 error
1. Turn the POWER RESET switch OFF then ON (or unplug and replug the power supply.
Check items
2. If the system still displays E615, replace the main PCB.
Are the DIP S/W on the
PCB properly set?
NO
Change the DIP S/W to
the proper settings
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.
Yes
Reset the unit
Description
Check method
Description