Rinnai Water Heater Error Code 16: How to Fix It

Q: What causes Rinnai error code 16 to appear?

Error code 16 appears when the outlet water temperature exceeds safe limits, typically caused by low water flow, scale buildup in the heat exchanger, faulty temperature sensors, incorrect gas pressure, or temperature settings that are too high.

Q: Is it safe to use my water heater with error code 16?

No, you should not use your water heater when error code 16 is displayed. This error indicates dangerously hot water that can cause severe burns and potential damage to your plumbing system.

Q: How often should I descale my Rinnai water heater to prevent error code 16?

Descaling frequency depends on your water hardness, but typically every 1-2 years for moderate hardness and annually for very hard water. Regular maintenance helps prevent scale buildup that can trigger over-temperature errors.

Q: Can I reset Rinnai error code 16 myself?

Yes, you can reset the error code by pressing the reset button, but you must first identify and fix the underlying cause. Simply resetting without addressing the problem will cause the error to return and may be dangerous.

Q: What temperature should I set my Rinnai water heater to avoid error code 16?

Set your Rinnai water heater to 120-125°F for optimal safety and efficiency. Higher settings increase the risk of over-temperature errors and scalding, while lower settings may not provide adequate hot water for your needs.

Abstract

Rinnai error code 16 indicates your water heater's outlet temperature has exceeded safe limits, triggering an over-temperature warning. This is a critical safety issue that requires immediate attention to prevent scalding and potential damage to your water heater system.