Navien Tankless Water Heater Error Code 012: How to Fix It

Q: What does Navien error code 012 mean?

Error code 012 indicates an air pressure sensor fault, meaning the sensor detects abnormal air pressure in the exhaust or intake system. This is usually due to blockages or a faulty sensor.

Q: Can I reset Navien error code 012 myself?

Yes, after fixing the underlying issue (like clearing a blocked vent), you can reset the unit by turning off power for 10 seconds and then turning it back on. Some models have a reset button on the control board.

Q: How much does it cost to fix Navien error code 012?

If you DIY, the cost is minimal (only tools or a replacement sensor ~$20-$50). Hiring a pro can range from $150-$300 depending on the issue and labor rates.

Q: Is error code 012 dangerous?

It can be. The error usually prevents the unit from firing to avoid unsafe operation. If venting is blocked, carbon monoxide could accumulate. Always address this error promptly.

Q: How often should I maintain my Navien tankless water heater to avoid error 012?

Annual maintenance is recommended. This includes cleaning the air intake filter, flushing the heat exchanger, and inspecting vents for blockages.

Abstract

Error code 012 on a Navien tankless water heater indicates an air pressure sensor fault. This means the unit's sensor has detected abnormal pressure in the exhaust or intake system, often due to blockages or a faulty sensor. Follow these steps to diagnose and fix the issue safely.