Rinnai Water Heater Error Code 31: How to Fix It

Q: What causes Rinnai error code 31?

Error code 31 is caused by a faulty burner sensor on the heat exchanger. This can result from normal wear, corrosion, loose connections, or debris buildup on the sensor.

Q: Can I reset Rinnai error code 31 without fixing it?

While you can temporarily reset the error, it will return if the underlying sensor fault isn't addressed. The error is a safety feature, so it's important to diagnose and fix the root cause.

Q: How much does a Rinnai burner sensor cost?

Replacement burner sensors typically cost between $30-80 depending on your specific Rinnai model. Always use OEM or approved replacement parts for safety and reliability.

Q: Is error code 31 dangerous?

The error itself isn't dangerous as it shuts down the unit for safety. However, a faulty burner sensor could potentially allow unsafe operating conditions, which is why the unit stops working when this error occurs.

Q: How often should burner sensors be replaced?

Burner sensors typically last 5-10 years depending on usage and maintenance. Regular cleaning and maintenance can extend their lifespan significantly.

Abstract

Rinnai error code 31 indicates a burner sensor fault on the heat exchanger, which monitors the temperature during operation. This sensor ensures safe and efficient combustion by detecting if the burner is heating properly. When this sensor fails, your water heater will shut down to prevent potential safety issues.