E035
Navien Gas Valve / Combustion Control Fault

Display shows E035; unit may not fire or may shut down intermittently.

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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.

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Possible Causes

Defective gas valve actuator, Incorrect gas valve wiring, Internal gas valve failure, Main PCB output fault to gas valve

How to Fix / Troubleshooting

Safety: Gas valve diagnostics and replacement must be performed by a licensed gas technician. Do not attempt to open or adjust the gas valve.

User-level checks:

  • 1. Power reset: Turn the unit OFF, wait 30 seconds, then ON. See if E035 clears temporarily.
  • 2. Check for other error codes: If E035 appears with other ignition or flame codes, note them for the technician.
  • 3. Visual inspection: With power OFF, remove the cover and inspect the gas valve wiring harness for loose or damaged connectors.

If E035 persists, a technician will need to test the gas valve coil resistance, verify control signals from the PCB, and replace the gas valve or PCB as needed.

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Repair Difficulty

Professional Required 5/5

Required Part

Gas Valve Assembly
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