Navien Water Heater Error Code 27: How to Fix It

Q: What causes Navien error code 27?

Error code 27 is caused by a malfunctioning air pressure sensor that monitors proper combustion air flow. Common causes include blocked vents, damaged sensor connections, a faulty sensor, or debris in the venting system.

Q: Can I use my Navien water heater with error code 27?

No, you should not operate your Navien water heater with error code 27. This error indicates a safety issue with air pressure monitoring that could lead to improper combustion or carbon monoxide production.

Q: How much does it cost to fix Navien error code 27?

DIY repair costs $50-150 for a replacement air pressure sensor. Professional repair typically costs $200-400 including parts and labor, depending on your location and the specific issue found.

Q: How long do Navien air pressure sensors last?

Navien air pressure sensors typically last 5-8 years under normal conditions. Factors like extreme weather, poor venting, or debris exposure can reduce sensor lifespan.

Q: Will error code 27 clear itself?

Error code 27 may temporarily clear if caused by a minor blockage or loose connection, but it will likely return if the underlying problem isn't fixed. Permanent resolution requires identifying and addressing the root cause.

Abstract

Navien error code 27 indicates an air pressure sensor fault in your tankless water heater. This error prevents the unit from operating safely and requires immediate attention to restore hot water service.