Navien Water Heater Error Code 47: How to Fix It

Q: What causes Navien error code 47?

Error code 47 is caused by a faulty inlet water temperature sensor that is either open-circuited, short-circuited, or has damaged wiring connections. Corrosion, age, or electrical surges can damage the sensor.

Q: Can I still use hot water with error code 47?

Your Navien unit may continue operating with reduced efficiency, but it's not recommended. The faulty sensor can cause improper temperature control, potential overheating, or complete shutdown for safety reasons.

Q: How much does a Navien inlet temperature sensor cost?

Inlet temperature sensors typically cost between $30-80 depending on your specific Navien model. Professional installation may add $100-200 in labor costs.

Q: How often should I replace the inlet temperature sensor?

Temperature sensors typically last 8-12 years under normal conditions. Replace them only when they fail testing or show error codes, as preventive replacement isn't usually necessary.

Q: Will error code 47 reset itself?

No, error code 47 will not reset automatically. You must fix the underlying sensor problem and manually reset the unit or power cycle it to clear the error code.

Abstract

Navien error code 47 (or E047) indicates a problem with the inlet water temperature sensor, which is either open or short-circuited. This sensor monitors the incoming water temperature to ensure your water heater operates efficiently and safely.