Rheem Water Heater Error Code 15: How to Fix It

Q: What causes Rheem error code 15?

Error code 15 is caused by the boiling sensor detecting excessive water temperature, typically due to restricted water flow, scale buildup in the heat exchanger, faulty sensors, or improper gas pressure.

Q: Is it safe to use my water heater with error code 15?

No, do not use the water heater with error code 15. This indicates a serious overheating condition that could lead to scalding water, equipment damage, or safety hazards. Shut down the unit immediately.

Q: How often should I flush my Rheem water heater to prevent error 15?

In areas with hard water, flush the heat exchanger annually. In areas with soft water, every 2-3 years may be sufficient. Regular maintenance helps prevent scale buildup that can trigger this error.

Q: Can I reset Rheem error code 15 without fixing the problem?

While you may be able to reset the error temporarily, it will return if the underlying cause isn't addressed. The boiling sensor is a critical safety device, so proper diagnosis and repair are essential.

Q: How much does it cost to fix Rheem error code 15?

Costs vary depending on the cause. Simple flushing may cost $100-200, while heat exchanger replacement can cost $300-600 plus labor. Sensor replacement typically costs $150-300 including parts and labor.

Abstract

Rheem error code 15 indicates the boiling sensor has been activated in the heat exchanger, meaning water temperature has exceeded safe levels. This is a critical safety issue that requires immediate attention to prevent damage and ensure safe operation.