Rinnai tankless water heaters provide efficient and on-demand hot water, but occasionally, users may encounter error code 10, which indicates an air supply or exhaust blockage within the system. It’s crucial to address this issue promptly to ensure the water heater functions optimally and safely. In this article, we will guide you through the Rinnai troubleshooting steps to resolve error code 10 and restore your Rinnai tankless water heater’s performance.

7 Easy Steps To Fix Rinnai Error Code 10

  1. Ensure Rinnai Approved Venting Materials:
    One of the fundamental requirements for Rinnai tankless water heaters is the use of approved venting materials. These materials are specifically designed to ensure proper airflow and venting efficiency. Using non-approved materials can lead to blockages and compromise the safety and performance of the system. Prior to installation, consult the Rinnai installation manual for a list of approved venting materials and follow the guidelines diligently.
  2. Check Flue Inlet and Exhaust:
    To begin troubleshooting error code 10, inspect the flue inlet and exhaust carefully. Obstructions in these areas can impede the airflow, leading to blockages and the error code. Take the time to examine the flue inlet and exhaust for any debris, such as leaves or animal nests. Safely remove any obstructions to restore proper airflow.
  3. Verify Vent Components’ Connections:
    Proper connection of the venting components is essential for the efficient operation of your Rinnai tankless water heater. Examine all vent components, including pipes, elbows, and termination caps, to ensure they are correctly installed and securely connected. Be vigilant for any gaps or leaks that may cause air supply or exhaust blockages. Address any connection issues promptly.
  4. Check Vent Length:
    The length of the venting system plays a vital role in the optimal functioning of the Rinnai water heater. If the vent length exceeds the recommended limits specified in the installation manual, it can cause inadequate airflow and lead to error code 10. Review the manual and verify that your vent length adheres to the manufacturer’s guidelines.
  5. Ensure Correct Installation of Condensation Collar:
    Rinnai tankless water heaters employ a condensation collar to manage condensation buildup within the venting system. An incorrectly installed or malfunctioning collar can contribute to air supply or exhaust blockages. Double-check that the condensation collar is installed correctly and functioning as intended.
  6. Verify Dip Switch Settings:
    Dip switches control various functions in your Rinnai water heater, including venting. Incorrect dip switch settings can result in ventilation issues and trigger error code 10. Consult the installation manual to locate the dip switches and ensure they are set according to the manufacturer’s instructions. Adjust them as necessary to ensure proper airflow and exhaust.
  7. Check Fan for Blockage:
    The fan in your Rinnai tankless water heater plays a crucial role in maintaining proper airflow. Obstructions within the fan can impede its operation and lead to air supply or exhaust blockages. Carefully inspect the fan and remove any debris or obstructions that may hinder its performance.

Remember, safety is paramount throughout the troubleshooting process. Always turn off the power to the water heater before inspecting or working on any components. If you are unsure about any aspect of the troubleshooting steps or if the error code persists, it is recommended to seek professional assistance.

Resolving error code 10 on your Rinnai tankless water heater really isn’t that hard if you follow the troubleshooting steps we outlined above. By ensuring the use of approved venting materials, checking for blockages in the flue inlet and exhaust, and verifying proper connections. If you try to fix it and don’t have success call in a pro but I have full confidence that if you looked this up you can fix it.

Rinnai Indoor Technical Data Sheet PDF