Rinnai error code 10

Rinnai tankless water heaters are renowned for their efficiency and durability. However, like any piece of equipment, they can sometimes experience issues. One of the most frequently reported problems by Rinnai users is the dreaded ‘Rinnai error code 10’. If you’ve recently encountered this error on your Rinnai device, you’re likely eager to understand its cause and find a quick solution. This comprehensive guide will provide you with everything you need to know about this error and how to fix it.

What Does Rinnai Error Code 10 Indicate?

Simply put, Rinnai error code 10 is an ignition failure. Your water heater tried to ignite but was unsuccessful. This error suggests that there is a problem preventing your device from firing up, which means you won’t get hot water until the issue is addressed.

Rinnai error code 10

Common Reasons for Rinnai Error Code 10

Before we delve into the solutions, it’s crucial to understand the reasons behind this error code. This knowledge will guide you to a more effective troubleshooting approach.

  1. Gas Supply Issues: Insufficient gas supply can prevent ignition. Ensure your gas is on, and the gas type matches your unit’s specifications.
  2. Blocked Flue or Vent: Blocked or restricted vents can impede combustion airflow, leading to ignition failure.
  3. Faulty Igniter: Over time, the igniter can wear out, leading to an inability to ignite the gas.
  4. Dirty Burner: Dirt and debris can accumulate on the burner, impeding its function.

How to Fix Rinnai Error Code 10?

Now that we’ve established the potential causes, let’s explore the solutions. Always remember, safety first!

Fix 1: Check the Gas Supply

Ensuring that your Rinnai tankless water heater has a consistent and appropriate gas supply is critical. An inadequate gas supply is one of the primary reasons for ignition failure, indicated by the Rinnai error code 10. Follow these detailed steps to ensure your unit’s gas supply is uninterrupted and adequate.

  1. Power Off the Unit: Before attempting any fix, always ensure the device is powered off to avoid accidental ignition or other potential hazards.
  2. Locate the Gas Valve: The gas valve is usually located close to the water heater or on the gas pipe leading to the unit. It’s a wheel or lever-like mechanism.
  3. Verify the Gas Valve Position: Check to see if the gas valve is in the ‘ON’ position. If it’s in the ‘OFF’ position, this could be the reason for the ignition failure. The valve should typically be parallel to the gas line when it’s in the ‘ON’ position.
  4. Confirm Gas Type Compatibility: Ensure that the type of gas supplied (natural gas or propane) matches your unit’s specifications. Using the wrong gas type can prevent the heater from igniting and might even cause damage.
  5. Inspect for Gas Leaks: Although rare, gas leaks can reduce the pressure and amount of gas reaching the unit. Smell around the gas line and connections. If you detect a sulfur or rotten egg odor, it might indicate a gas leak. In such a case, turn off the gas supply immediately and contact a professional.
  6. Check Propane Tank Levels (if applicable): For those using propane, inspect the tank’s level. An empty or nearly empty tank can be the cause of the error. If low, refill the propane tank.
  7. Power On and Test: After ensuring everything is in order, turn the Rinnai unit back on. Observe if it ignites properly and if the Rinnai error code 10 has been cleared.
  8. Regular Maintenance: To avoid future ignition problems, schedule regular checks on your gas supply. Ensure the pipes are in good condition and that the unit receives a consistent gas supply.

The gas supply is a vital component for the proper functioning of your Rinnai water heater. Always treat any gas-related issues with utmost caution. If you’re ever unsure or feel the situation might be dangerous, it’s best to consult with a trained technician. Safety should always be the top priority.

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Fix 2: Inspect Flue and Vent for Blockages

A clear pathway for the combustion air and exhaust is essential for the safe and efficient operation of your Rinnai tankless water heater. Blockages in the flue or vent can prevent sufficient airflow, which in turn can lead to ignition issues, represented by the Rinnai error code 10. Below are the steps to inspect and clear any obstructions from the flue and vent.

  • Safety First: Always turn off the power to your Rinnai unit before starting any inspection or maintenance. This ensures your safety and prevents any accidental operation.
  • Access the Flue and Vent: Depending on your installation, the flue and vent might be visible from the outside or might require some disassembly. Refer to your unit’s manual for specific guidance on accessing these components.
  • Visual Inspection: Start by looking for any obvious signs of blockages. This could be in the form of leaves, bird nests, accumulated debris, or even snow in colder climates.
  • Physical Inspection: Using a flashlight, peer into the flue and vent to inspect deeper sections. Ensure there are no hidden obstructions that might not be immediately visible.
  • Clean and Clear: If you identify any obstructions, use appropriate tools like brushes or a blower to gently remove the debris. Be careful not to damage the flue or vent during this process.
  • Check the Vent Cap: The vent cap, situated at the end of the vent, can sometimes be a spot where debris accumulates or where pests might set up residence. Ensure this cap is clear of any obstructions.
  • Inspect for Damage: While blockages are a common issue, physical damage to the vent or flue can also impede airflow. Look for signs of cracks, holes, or any disconnections in the venting system.
  • Reassemble and Test: Once you’ve cleared any obstructions and ensured the flue and vent are in good condition, reassemble any parts you might have disassembled. Turn on the unit and observe its operation. The Rinnai error code 10 should ideally no longer be displayed.
  • Regular Checks: To prevent recurrent issues, periodically inspect the flue and vent, especially after severe weather conditions or in seasons when debris is likely to accumulate.
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To sum it up, a clear flue and vent system are crucial not just for the efficient operation of your Rinnai water heater, but also for safety. Carbon monoxide produced during combustion needs a clear pathway to exit. If you’re ever uncertain about the condition of your flue or vent, or if the error code persists after your checks, consult with a professional technician. Safety and proper operation should always be the primary considerations.

Fix 3: Examine and Replace the Igniter

The igniter plays a pivotal role in sparking the gas mixture, allowing the Rinnai tankless water heater to produce hot water. A malfunctioning or worn-out igniter can directly lead to the Rinnai error code 10, indicating ignition failure. Here’s a step-by-step guide to inspecting and potentially replacing the igniter.

  1. Turn Off the Unit: For safety purposes, ensure the Rinnai unit is powered off and unplugged. Wait for a few minutes to let the unit cool down if it was recently in operation.
  2. Access the Igniter: Open the unit’s front panel. The igniter’s location might vary based on your model, so it’s advisable to consult the user manual. Typically, the igniter is found near the burner assembly.
  3. Visual Inspection: Examine the igniter for visible signs of wear, damage, or soot build-up. Blackened spots, cracks, or an excessively worn-out tip can indicate a faulty igniter.
  4. Test the Igniter: For those comfortable with using a multimeter, you can check the igniter’s resistance. An igniter outside the recommended resistance range (usually specified in the user manual) needs replacement.
  5. Clean Gently: If the igniter has minor soot or dirt, gently clean it with a soft cloth or brush. Avoid using any abrasive materials or liquids, as these can damage the igniter.
  6. Replace if Necessary: If the igniter appears damaged or tests outside the specified resistance range, it’s time for a replacement. Purchase a compatible igniter for your Rinnai model. Carefully disconnect the old igniter, ensuring you note the connection points, and install the new one.
  7. Reassemble and Power On: Once you’ve either cleaned or replaced the igniter, reattach the front panel and restore power to the unit. Turn it on and monitor its performance. Ideally, the Rinnai error code 10 should have disappeared, signaling successful ignition.
  8. Regular Maintenance: It’s beneficial to periodically inspect the igniter and other crucial components of your water heater. This proactive approach can help prevent unexpected errors and prolong the unit’s lifespan.

Fix 4: Clean the Burner Assembly

The burner assembly is where the magic happens in your Rinnai tankless water heater. Here, the gas is ignited to heat water as it passes through the unit. Over time, dirt, soot, or other residues can accumulate on the burner, affecting its function and leading to Rinnai error code 10. Here’s a detailed procedure to clean the burner assembly and restore your heater’s optimal performance.

  • Shut Down the Unit: As always, safety first. Ensure that your Rinnai unit is turned off and unplugged. Allow it some time to cool down if it was recently active.
  • Access the Burner Assembly: Remove the unit’s front panel to expose the internal components. The burner assembly should be visible, typically situated centrally. Again, referring to your user manual can provide a clear picture of its location.
  • Visual Inspection: Before proceeding with cleaning, visually inspect the burner for signs of soot build-up, corrosion, or any visible damage. This step helps determine the kind of cleaning required.
  • Begin Cleaning: Using a soft-bristled brush, gently brush away any loose dirt or soot from the burner. Ensure you’re brushing in a direction that takes the debris away from the burner, not deeper into it.
  • Use Compressed Air: For a more thorough cleaning, using compressed air can be effective. Direct the airflow to remove any fine particles or residues that the brush couldn’t dislodge. When using compressed air, maintain a safe distance to avoid damaging the burner’s delicate parts.
  • Inspect the Burner’s Ports: These are the small openings on the burner where the gas comes out for ignition. Ensure they are free of blockages. If you find any obstructions, use a thin wire or needle to gently clear the ports. However, exercise caution to prevent any damage.
  • Reassemble the Unit: Once satisfied with the cleaning, reposition the burner assembly (if it was moved). Securely attach the front panel back onto the unit.
  • Test Your Rinnai Heater: Restore power to the unit and turn it on. Monitor the unit for a while to ensure that the Rinnai error code 10 doesn’t reappear and that the ignition process is smooth.
  • Regular Burner Check-ups: To maintain peak performance and prevent recurrent issues, make it a practice to check and clean the burner assembly periodically. This proactive approach not only prevents unexpected problems but also extends the life of your water heater.

Fix 5: Evaluate the Flame Rod

The flame rod in your Rinnai tankless water heater detects the presence of a flame. If this component is dirty or malfunctioning, it may not sense the flame correctly, leading to ignition problems and triggering the Rinnai error code 10. Properly evaluating and addressing issues with the flame rod can restore the unit’s functionality.

  1. Safety Precautions: Before diving in, ensure the Rinnai unit is turned off, unplugged, and given ample time to cool down if it was operating recently.
  2. Access the Flame Rod: Start by opening the unit’s front panel. The flame rod is typically located near the burner assembly. Use your user manual for specific guidance on its exact location within your model.
  3. Visual Examination: Inspect the flame rod for any noticeable deposits, corrosion, or damage. A flame rod covered in soot or other residues may not function effectively.
  4. Gentle Cleaning: If you notice any dirt or soot on the flame rod, use a soft cloth or fine-grit sandpaper to gently clean it. Ensure you don’t apply excessive force, as this can damage the rod.
  5. Check Connections: The flame rod connects to the unit through wires. Ensure these connections are tight and free from damage. Loose or corroded connections can impede the rod’s ability to transmit signals to the unit.
  6. Test the Flame Rod: For those familiar with using a multimeter, you can test the flame rod’s resistance to ensure it’s within the recommended range specified in the user manual.
  7. Replace if Necessary: If you find the flame rod is damaged, corroded beyond repair, or testing outside the specified resistance range, consider replacing it with a compatible component for your Rinnai model.
  8. Reassemble and Restart: After either cleaning or replacing the flame rod, reposition it correctly, ensuring all connections are secure. Reattach the front panel, restore power to the unit, and turn it on. Observe the unit’s operation to see if the Rinnai error code 10 has been resolved.
  9. Schedule Regular Inspections: To keep your unit in top shape and avoid recurring issues, periodically inspect the flame rod and other critical components. Timely maintenance can prevent unexpected disruptions and enhance the longevity of your water heater.

Fix 6: Check the Gas Supply and Pressure

Gas supply is the lifeblood of your Rinnai tankless water heater. Without the right gas pressure and supply, ignition won’t occur, potentially resulting in the Rinnai error code 10. To ensure the consistent operation of your unit, it’s essential to regularly check the gas supply and pressure. Here’s a detailed guide:

  • Ensure Safety: First and foremost, power off your Rinnai unit and unplug it. If you smell gas, immediately turn off the gas supply, vacate the area, and contact a professional.
  • Verify Gas Supply: Ensure that the gas supply valve is fully open. Sometimes, the valve might be accidentally turned off or not be fully open, restricting the gas flow.
  • Inspect the Gas Lines: Check the gas lines for any visible damages, kinks, or obstructions. Physical damage can compromise the flow of gas, causing ignition issues.
  • Measure Gas Pressure: Using a manometer, measure the gas pressure while the unit is in operation. Ensure it aligns with the specifications outlined in the user manual for your specific Rinnai model.
  • Check for External Factors: If you’re using propane gas, cold temperatures can affect the pressure in the tank. Ensure the tank isn’t almost empty, as low levels can lead to inconsistent gas pressure.
  • Examine the Gas Type: Confirm that your Rinnai unit is set up for the type of gas you’re using, whether it’s natural gas or propane. Using the wrong gas type can lead to ignition failures.
  • Clean the Gas Filter: Over time, the gas filter can accumulate debris, affecting the gas flow. Access the filter, usually located near the gas inlet, and clean it thoroughly. This ensures consistent gas flow to the unit.
  • Test the Unit: After verifying the gas supply and pressure, reassemble any components if disassembled. Power on the unit and check its operation. The Rinnai error code 10 should no longer be displayed if the issue was related to gas supply or pressure.
  • Schedule Periodic Maintenance: Like any other home appliance, your Rinnai water heater benefits from regular checks. This helps in early detection of potential gas-related issues and ensures the unit’s long-term efficiency.

A steady and consistent gas supply is vital for the smooth functioning of your Rinnai tankless water heater. Addressing gas-related issues not only helps in preventing the Rinnai error code 10 but also ensures safety and efficient operation. If you still experience issues after checking the gas supply and pressure or are uncertain about any step, it’s recommended to contact a qualified Rinnai service technician. They can offer a comprehensive solution and ensure your unit’s peak performance.

Fix 7: Inspect the Venting System

The venting system of your Rinnai tankless water heater ensures safe and efficient removal of exhaust gases. If there’s a problem with the venting system, it might interfere with proper combustion, leading to the Rinnai error code 10. Let’s explore how to thoroughly inspect and resolve venting issues.

  1. Prioritize Safety: Before starting, ensure the Rinnai unit is turned off and disconnected from power. Give it some time to cool down if it was running.
  2. Access Venting System: Depending on your installation, the venting system could be a direct vent (intakes and exhausts air from outside) or a single vent (exhausts air outside only). Locate the vent pipes on your unit.
  3. Visual Inspection: Examine the vent pipes for any signs of damage, disconnection, or obstruction. Look out for things like bird nests, debris, or leaves that might block airflow.
  4. Confirm Proper Venting Configuration: Check the configuration against the guidelines in the user manual. Ensure there are no excessively long vent lengths or too many elbows, as these can hinder airflow.
  5. Examine the Termination Points: Ensure that the intake and exhaust terminations outside your home are free from obstructions and are placed a sufficient distance apart (as specified in the manual) to prevent exhaust air from being sucked back into the intake.
  6. Check for Condensation: Excessive condensation in the venting system can lead to blockages and reduced efficiency. If there’s evidence of water buildup, consider a condensation drain or addressing the root cause of excessive condensation.
  7. Ensure Proper Vent Material: Use only the venting materials approved by Rinnai. Avoid using PVC or other non-recommended materials, as they might not be safe for the high temperatures of the exhaust.
  8. Test the System: After inspecting and making any necessary adjustments to the venting system, reconnect power to your unit and turn it on. Monitor the operation to see if the Rinnai error code 10 persists.
  9. Consistent Monitoring: Given the venting system’s importance in ensuring safety and efficiency, it’s beneficial to periodically inspect it for damages or obstructions, especially after severe weather conditions.

Fix 8: Examine the Electrical Wiring and Connections

Electrical issues can be a silent culprit behind the Rinnai error code 10. From frayed wires to loose connections, electrical problems can hinder the ignition process. Let’s delve into how to inspect and correct these issues, ensuring the smooth functioning of your Rinnai water heater.

  1. Begin with Safety: Ensure your Rinnai unit is completely powered off and disconnected from the mains. This step is essential to prevent any electrical shocks.
  2. Open the Unit: Gently remove the unit’s front panel to access its internal components, where the primary wiring and connections reside.
  3. Visual Check: Inspect the visible wires for any signs of wear, fraying, or damage. Damaged wires can impede electricity flow, affecting the unit’s function.
  4. Secure Loose Connections: Go through each electrical connection, ensuring they’re tight and secure. Loose connections can lead to inconsistent power delivery, impacting ignition.
  5. Check Igniter and Electrode: These components play a direct role in the ignition process. Ensure their wiring is intact, and they’re free from damage or wear.
  6. Verify Grounding: Proper grounding is essential for safety and efficient operation. Ensure the unit is well-grounded, with no corrosion on the grounding wire or terminal.
  7. Use a Multimeter: If you’re comfortable with electronics, use a multimeter to test the continuity and resistance of the wires and components. This can pinpoint if there’s a break or if a part is not functioning as it should.
  8. Replace Damaged Components: If you find any wires or parts that are damaged beyond simple repair, consider replacing them with Rinnai-approved components. Always prioritize genuine parts to ensure compatibility and safety.
  9. Reassemble and Test: Once satisfied with your inspection and any corrections, carefully reassemble the unit. Reconnect it to the power and monitor its performance. The Rinnai error code 10 should ideally be resolved if electrical issues were the root cause.
  10. Regular Maintenance is Key: While electrical components might not wear out as quickly as moving parts, they still require periodic checks. Regular maintenance can preemptively identify issues, saving time and hassle in the long run.
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Preventing Tips for Rinnai Error Code 10

Maintaining the efficient operation of your Rinnai tankless water heater not only ensures you always have hot water on demand but also extends the lifespan of your unit. Here are some essential tips to prevent encountering the Rinnai error code 10:

1. Regular Maintenance:

  • Scheduled Check-ups: Just like your car needs periodic servicing, so does your water heater. Have a professional check the unit once or twice a year.
  • Follow the Manual: Your Rinnai water heater’s user manual offers a wealth of information, including maintenance guidelines. Adhering to these can avert many common issues.

2. Monitor Gas Supply:

  • Consistent Gas Levels: Ensure your gas tanks (especially if you’re using propane) are never too low. Low gas can lead to fluctuations in pressure.
  • Check for Leaks: Periodically check the gas line for any potential leaks or cracks.

3. Ventilation is Key:

  • Regular Vent Inspection: At least twice a year, inspect the venting system for any obstructions or damages.
  • Positioning: Ensure the exhaust and intake vents are adequately spaced outside your home, preventing exhaust air from being re-introduced into the unit.

4. Clean Water In, Clean Water Out:

  • Use a Filter: If your water supply has a lot of sediments or hard water elements, consider installing a whole-home water filter.
  • Flush Regularly: Descale and flush your Rinnai unit at least once a year to remove any mineral buildup.

5. Stay Electrically Safe:

  • Inspect Wiring: At least once a year, visually inspect the unit’s internal wiring for any visible signs of wear or damage.
  • Ensure Proper Grounding: A well-grounded system minimizes the risk of electrical malfunctions.

6. Educate Household Members:

  • User Guidance: Make sure everyone in the household knows the basics of operating the water heater. Misuse or overuse can lead to unexpected errors.
  • Safety First: Ensure family members know the primary safety protocols, especially related to gas supply.

7. Monitor Error Codes:

  • Stay Proactive: If your unit displays other error codes, address them promptly. This proactive approach can prevent further issues down the line.
  • Document: Keep a record of any past issues or repairs. This can be helpful for future diagnostics.

The key to preventing the Rinnai error code 10 and ensuring a smoothly running tankless water heater lies in regular maintenance, timely interventions, and a bit of user education. While these tips can significantly reduce the chances of issues, always remember that if in doubt, consulting a professional is the best course of action.


Encountering a Rinnai error code 10 can be frustrating, especially when you’re eagerly awaiting a warm shower. However, with the insights provided in this guide, you’re now equipped to tackle this challenge head-on. Whether you choose the DIY route or decide to call in the professionals, always prioritize safety and efficiency. With proper care and maintenance, your Rinnai water heater should serve you efficiently for years to come.


What is Rinnai error code 10?

It indicates an ignition failure in your Rinnai water heater.

Can I fix Rinnai error code 10 myself?

Yes, with proper guidance, many issues can be DIY-ed. Always prioritize safety.

What causes this ignition failure?

Factors include gas supply issues, venting problems, or electrical malfunctions.

How often should I service my Rinnai heater?

Regular maintenance, ideally annually, can prevent many common issues.