Navien Water Heater Error Code 515: How to Fix It

Q: What causes Navien error code 515?

Error code 515 is caused by a malfunction in the main relay on the PCB (control board). This can result from power surges, electrical overload, moisture infiltration, component aging, or manufacturing defects in the relay itself.

Q: Can I reset Navien error code 515 myself?

Yes, you can try resetting the error by turning off power for 5 minutes, then turning it back on and pressing the reset button. However, if the main relay is actually faulty, the error will return and require professional repair or PCB replacement.

Q: Is Navien error code 515 dangerous?

While not immediately dangerous, error code 515 can prevent your water heater from operating properly and may indicate electrical issues. If you notice any burning smells, sparking, or other electrical problems, shut off power immediately and call a professional.

Q: How much does it cost to fix Navien error code 515?

Repair costs typically range from $200-600 depending on whether just the relay needs replacement ($200-300) or the entire PCB needs replacement ($400-600). Labor costs vary by location but expect 1-2 hours of technician time.

Q: How long does a Navien PCB main relay last?

Main relays typically last 8-15 years under normal operating conditions. Factors like power quality, electrical surges, humidity, and usage patterns can affect relay lifespan. Regular maintenance can help identify potential issues before complete failure occurs.

Abstract

Navien error code 515 indicates a PCB (Printed Circuit Board) main relay fault in your water heater. This is a critical electrical issue where the main relay on the control board has malfunctioned, preventing proper operation of your unit. While some basic troubleshooting can be done safely, this error often requires professional repair due to electrical components involved.