Rheem Water Heater Error Code 12: How to Fix It

Q: What causes Rheem error code 12 flame failure?

Common causes include a dirty flame sensor, blocked venting, insufficient gas pressure, dirty burner ports, or a faulty gas valve. Poor electrical connections or control board issues can also trigger this error.

Q: Is it safe to use my water heater with error code 12?

No, do not use your water heater when error code 12 appears. This indicates a flame safety issue that could pose risks. The unit should be repaired before returning to service.

Q: How often should I clean my Rheem water heater flame sensor?

Clean the flame sensor annually during routine maintenance, or more frequently if you live in a dusty environment. A dirty flame sensor is the most common cause of flame failure errors.

Q: Can I reset Rheem error code 12 without fixing the problem?

While you can reset the error by cycling power, this doesn't address the underlying safety issue. The error will likely return until the root cause is properly diagnosed and repaired.

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

Costs range from free (cleaning flame sensor) to $200-500 for professional repair. Simple cleaning and maintenance can often resolve the issue, while gas valve or control board replacement requires professional service.

Abstract

Rheem water heater error code 12 indicates flame failure during operation, meaning the burner flame was lost while the unit was heating. This is a critical safety issue that requires immediate attention to restore hot water and prevent potential gas safety hazards.