Navien Water Heater Error Code 022: How to Fix It

Q: What does Navien error code 022 mean?

Error 022 indicates a flow sensor fault, meaning the unit isn't detecting water flow. This can be caused by a closed valve, clogged filter, or faulty sensor.

Q: How do I reset Navien error code 022?

Turn off the unit's power for 30 seconds, then turn it back on. If the error returns, follow the troubleshooting steps to clean the filter or check the flow sensor.

Q: Can a dirty water filter cause error 022?

Yes, a clogged inlet water filter restricts flow, triggering the flow sensor fault. Cleaning the filter often resolves the error.

Q: Where is the flow sensor on a Navien water heater?

The flow sensor is located on the cold water inlet pipe, usually near the bottom of the unit, housed in a brass fitting.

Q: How much does it cost to fix Navien error 022?

DIY cost is minimal (filter cleaning). A replacement flow sensor costs around $30-$60. Professional service may cost $150-$300 depending on labor.

Abstract

Navien error code 022 indicates a flow sensor fault, meaning the water heater isn't detecting water flow properly. This typically occurs due to a stuck or faulty flow sensor, debris in the inlet filter, or a closed water valve.