Navien unit displays E445; may be accompanied by erratic operation.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Corrupted PCB firmware, Internal sensor reference failure, Electrical surge damage, Defective main PCB

How to Fix / Troubleshooting

Safety: Turn OFF power before touching electronics.

Steps:

1. Power reset: Turn OFF power for at least 5 minutes to fully discharge the PCB, then restore power.
2. Check for other codes: Note any additional error codes that appear and provide them to a technician.

E445 generally indicates an internal PCB issue. The main control board may require replacement and firmware configuration by a Navien-authorized technician.

Repair Difficulty

Professional Required 5/5

Required Part

Main Control PCB

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