Navien error code 003

Encountering Navien error code 003 on your boiler? You’re not alone. This common issue often perplexes homeowners. But, don’t fret! Our comprehensive guide will help you understand, troubleshoot, and fix this error.

Understanding Navien Error Code 003

The Navien error code 003 typically indicates a problem with your boiler’s ignition. This error surfaces when your boiler fails to ignite or when the flame goes out unexpectedly. Several underlying issues can cause this code to appear.

Navien error code 003

Causes of Navien Error Code 003

  • Inadequate Gas Supply: At times, your boiler may not have enough gas supply to ignite. This issue can lead to Navien error code 003. Check your gas valve and make sure it’s fully open.
  • Blocked Ventilation: Proper ventilation is essential for your boiler’s ignition system. A blocked vent pipe can prevent the flame from igniting, triggering the error code. Regularly inspect and clean your vent pipes to avoid this.
  • Faulty Ignition: A faulty ignition is another common cause. Over time, ignitions can wear out or become dirty, leading to ignition failure.

How to Fix Navien Error Code 003?

Now that we know the causes, let’s dive into the fixes. Remember, safety first. Always turn off your boiler before beginning any troubleshooting.

Fix 1: Ensuring Adequate Gas Supply

To fix a potential gas supply issue, follow these steps:

  • Step 1: Check the Gas Valve: Locate the gas valve on your boiler. Ensure it’s fully open. If it’s partially closed, turn it counterclockwise to open fully.
  • Step 2: Check for Gas Leaks: Smell around your boiler for any gas odors. If you detect a gas smell, evacuate the building immediately and contact your gas supplier.
  • Step 3: Contact Gas Supplier: If the gas valve is fully open and there’s no gas smell, yet the error persists, contact your gas supplier. They can determine if there’s a disruption in your gas supply.
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Remember, never attempt to fix gas leaks yourself. It’s a job for professionals due to the inherent risks involved.

Fix 2: Clearing Blocked Ventilation

Let’s explore how to clear blocked ventilation, another common cause of Navien error code 003.

  • Step 1: Inspect the Vent Pipe: First, check the vent pipe for any blockages. Over time, debris, dust, or even small animals can clog the pipe.
  • Step 2: Clear the Blockage: If you find a blockage, remove it gently. Use a long, flexible brush for hard-to-reach areas.
  • Step 3: Verify the Fix: After clearing the blockage, restart your boiler. If the error code persists, consult a professional.

Always remember, your safety is paramount. If you’re uncomfortable doing this, hire a professional to do the job.

Fix 3: Addressing a Faulty Ignition

A faulty ignition can cause Navien error code 003. Let’s understand how to handle this.

  • Step 1: Inspect the Ignition: Turn off your boiler and locate the ignition. Check it for any visible damage or soot buildup.
  • Step 2: Clean the Ignition: If you see soot, gently clean the ignition with a soft, dry cloth. Avoid using water or cleaning products as they can damage the ignition.
  • Step 3: Replace the Ignition: If cleaning doesn’t solve the problem or if you see visible damage, the ignition may need replacing. For this step, we recommend hiring a professional.

Remember, these fixes are general guidelines. If you’re unsure or uncomfortable performing these steps, it’s always best to call a professional.

Fix 4: Checking Electrical Connections

Electrical problems could also lead to Navien error code 003. Let’s walk through the steps to troubleshoot this.

  • Step 1: Turn Off the Boiler: Before checking any electrical connections, always ensure your boiler is turned off for safety.
  • Step 2: Inspect Electrical Connections: Check the wires connected to your boiler’s ignition. Look for loose or frayed wires.
  • Step 3: Secure Loose Wires: If you find any loose wires, secure them. If wires are frayed or damaged, they may need replacing.

Remember, working with electricity can be dangerous. If you’re unsure, consult with a professional electrician.

Fix 5: Resetting the Boiler

Sometimes, a simple reset can clear the Navien error code 003. Here’s how:

  • Step 1: Turn Off the Boiler: Turn off the boiler and unplug it from the power source.
  • Step 2: Wait for a Few Minutes: Wait for about 10-15 minutes. This break allows the boiler’s system to reset.
  • Step 3: Turn On the Boiler: Plug your boiler back into the power source and turn it on. If the error code clears, your boiler is back to normal.
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If none of these fixes work or if the error code reappears, it’s time to call in a professional. They can provide a thorough inspection and remedy the problem.

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Fix 6: Checking the Flame Rod

The flame rod in your boiler could be the reason behind Navien error code 003. Here are the steps to check and clean it.

  • Step 1: Turn Off the Boiler: For safety reasons, always turn off your boiler before inspecting.
  • Step 2: Locate and Inspect the Flame Rod: Find the flame rod in your boiler. Check it for any signs of corrosion or soot buildup.
  • Step 3: Clean or Replace the Flame Rod: If there’s soot, gently clean the flame rod with a soft, dry cloth. If the flame rod is corroded, it’s best to replace it. For replacing the flame rod, we suggest calling a professional to ensure safe and correct installation.

Fix 7: Checking the Heat Exchanger

Finally, a dirty or faulty heat exchanger can also cause Navien error code 003. Here’s how you can deal with this.

  • Step 1: Inspect the Heat Exchanger: Turn off your boiler and locate the heat exchanger. Check it for any visible soot or dirt buildup.
  • Step 2: Clean the Heat Exchanger: If you see dirt or soot, clean it gently using a soft brush.
  • Step 3: Consider Replacement: If the heat exchanger appears damaged or excessively dirty, it might need replacement. This task should be performed by a professional to ensure proper installation and safety.


Navien error code 003 can be a hassle, but with our comprehensive guide, you’re well-equipped to handle it. Whether it’s a gas supply issue, a blocked vent, a faulty ignition, electrical problems, or issues with the flame rod or heat exchanger, these fixes provide a roadmap. However, always prioritise safety and don’t hesitate to seek professional help when needed. Boiler maintenance can be a complex task, and there’s no harm in calling the experts.


Why does this error occur?

It can happen due to issues like inadequate gas supply, blocked ventilation, faulty ignition, or electrical problems.

Can I fix this error myself?

Yes, some fixes are simple and can be done yourself, like resetting the boiler or ensuring adequate gas supply.

How do I ensure my gas supply is adequate?

Check the gas valve on your boiler. If it’s partially closed, turn it counterclockwise to fully open it.

What should I do if the gas supply is not the issue?

There might be other causes like blocked ventilation or faulty ignition. Check these areas next.

How do I clear a blocked vent pipe?

You can gently remove the blockage using a long, flexible brush.

What if none of these fixes work?

If the error code persists after troubleshooting, it’s best to call a professional for assistance.

Is it safe to perform these fixes myself?

While you can perform some fixes, always prioritize safety. If you’re unsure, consult a professional.