How To Reset Error Code on Rinnai Tankless Water Heater

Rinnai tankless water heaters are known for their efficiency and reliability. However, like any other appliance, they are not immune to occasional hiccups and may display error codes from time to time. These error codes are designed to help you diagnose and resolve issues with your water heater. In this comprehensive guide, we’ll walk you through the steps of resetting error codes on your Rinnai tankless water heater.

Understanding Rinnai Tankless Water Heater Error Codes

Before we dive into the reset process, it’s crucial to understand what these error codes mean. Some common error codes include:

• Error Code 02: This indicates no burner operation during freeze protection mode.
• Error Code 10: This signifies a problem with air supply or exhaust blockage.
• Error Code 19: This code shows a problem with the gas burner.
• Error Code 25: This code represents a problem with the inlet water temperature sensor.
• Error Code 29: This code signifies a problem with the outlet water temperature sensor.

How to Reset the Error Code

Resetting your Rinnai tankless water heater is a relatively straightforward process. Here’s how you can do it:

1. Turn off all hot water faucets or taps connected to the water heater.
2. Locate the ON/OFF button on the front panel controller.
3. Press the ON/OFF button twice.

In case your error code does not clear or keeps reappearing, you might need to perform a hard reset:

1. Remove the front panel by unscrewing the four nuts that hold it in place.
2. Locate the A and B buttons near the PCB (printed circuit board).
3. Press and hold the A and B buttons simultaneously for five to eight seconds. The unit should reset and clear the error code.
4. Replace the front panel and secure it with the nuts.

When to Seek Professional Help

While many error codes can be cleared with a simple reset, some might require professional help. For instance, Error Code LC indicates a scale build-up in the heat exchanger. This issue can be temporarily resolved by unplugging the unit, waiting 60 seconds, and plugging it back in. However, to fully address the issue, you’ll need to flush the heat exchanger, which might require professional assistance.

Preventive Measures

To prevent error codes from appearing in the future, regular maintenance of your Rinnai tankless water heater is essential. This includes cleaning the unit periodically, performing an annual inspection, and flushing the heater to remove mineral deposits.

Remember, if you’re unsure about how to resolve a specific error code, it’s always best to consult the user manual or contact a qualified professional for assistance. Regular maintenance and cleaning can also help prevent these errors and keep your unit running smoothly.

In conclusion, Rinnai tankless water heaters are sophisticated pieces of equipment designed to provide you with hot water on demand. While they are generally reliable, understanding how to reset error codes is a handy skill to have. We hope this comprehensive guide helps you maintain your water heater in top shape for years to come.