Navien Water Heater Error Code 28: How to Fix It

Q: What causes Navien error code 28 to appear?

Error code 28 is caused by a disconnected air pressure sensor, blocked air pressure hoses, water in the pressure lines, or a faulty air pressure sensor. It's a safety feature that prevents unsafe operation when combustion air pressure cannot be properly monitored.

Q: Can I reset Navien error 28 without fixing the problem?

You should not simply reset the error without addressing the underlying issue. Error 28 is a safety code that prevents potentially dangerous operation. The error will return until the air pressure sensing system is properly repaired.

Q: How much does it cost to fix Navien error code 28?

If it's just loose connections or blocked hoses, the fix is free DIY repair. A replacement air pressure sensor costs $50-$80. Professional service typically ranges from $150-$300 including parts and labor, depending on your location and the specific issue.

Q: Is Navien error 28 dangerous to ignore?

Yes, error 28 should never be ignored as it indicates a problem with the safety system that monitors combustion air pressure. Continuing to operate the unit could lead to incomplete combustion, carbon monoxide production, or other safety hazards.

Q: How long does a Navien air pressure sensor last?

Air pressure sensors typically last 5-8 years under normal conditions. Factors like installation quality, environmental conditions, and maintenance frequency can affect lifespan. Regular maintenance helps prevent premature sensor failure.

Abstract

Navien error code 28 (also displayed as E028) indicates an air pressure sensor disconnection or blocked air pressure hose. This safety feature prevents unsafe operation when the unit cannot properly detect combustion air pressure, requiring immediate attention.