Navien Water Heater Error Code 311: How to Fix It

Q: What does error code 311 mean on a Navien water heater?

Error code 311 indicates multiple flame failures during operation. The heater tried to light but failed repeatedly, often due to gas supply issues, dirty flame rods, or blocked vents.

Q: Can I reset Navien error code 311 myself?

Yes, you can reset the unit by turning it off, waiting a few minutes, and turning it back on. However, if the underlying issue is not fixed, the error will return.

Q: How do I clean the flame rod on a Navien water heater?

Turn off power and gas, remove the front cover, locate the flame rod near the burner, and gently clean it with fine-grit sandpaper. Wipe away debris before reassembling.

Q: Is error code 311 dangerous?

It can be if caused by a gas leak or blocked vent. Always ensure proper ventilation and address gas odor immediately. Otherwise, it's a safety feature preventing unsafe operation.

Q: How often should I maintain my Navien water heater to avoid error 311?

Annual maintenance including cleaning the flame rod, checking vents, and inspecting gas supply can help prevent this error.

Abstract

Error code 311 on your Navien tankless water heater means the unit has experienced multiple flame failures during operation. This error is serious and can stem from gas supply issues, combustion problems, or vent blockages. Follow these steps to diagnose and fix the issue safely.