Name: Navien NHB-150
Brand: Navien
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NHB Service Manual 119

Version 1.0

5.2.22 517Error

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

5.2.23 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 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.

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