Display shows E352; unit may not start or may shut down unexpectedly.

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

Defective main PCB, Loose internal harness between PCBs, Electrical interference, Incorrect grounding of unit

Safety: Turn OFF power before accessing internal electronics.

Steps:

1. Inspect ground connection: Ensure the unit is properly grounded at the electrical connection.
2. Reseat PCB harnesses: Carefully unplug and replug multi-pin connectors between the main PCB and any sub-boards.
3. Power reset: Restore power and test. If E352 returns, the main PCB is likely faulty.

Main PCB replacement should be performed by a Navien-authorized technician due to configuration and safety checks required.

Professional Required 5/5

Main Control PCB

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