Navien Water Heater Error Code 12: How to Fix It

Q: What does Navien error code 12 mean?

Error code 12 (E012) means flame loss during operation - the unit ignited properly but then lost the flame unexpectedly. This is usually caused by a dirty flame rod sensor or gas pressure issues.

Q: Can I fix Navien error code 12 myself?

Basic troubleshooting like cleaning the flame rod can be done by homeowners, but gas pressure adjustments and component replacement should be handled by licensed gas technicians for safety and warranty reasons.

Q: How often should I clean the flame rod?

Clean the flame rod annually as part of routine maintenance, or whenever you experience flame loss errors. Units in areas with hard water or high mineral content may need more frequent cleaning.

Q: Will error code 12 prevent hot water completely?

Yes, this is a critical safety error that shuts down the heating system completely. The unit will not produce hot water until the flame loss issue is resolved and the error is cleared.

Q: How much does it cost to fix Navien error code 12?

If cleaning the flame rod fixes it, there's no cost. Professional service calls typically range $150-300. Flame rod replacement costs $50-150 for the part plus labor, while gas pressure adjustments may require utility company involvement.

Abstract

Navien error code 12 (also shown as E012) indicates flame loss during operation, meaning your water heater detected a flame but then lost it unexpectedly. This critical error is typically caused by a faulty flame rod sensor or inadequate gas pressure to the unit.