How to Fix Orange Flame on Gas Furnace

Are you seeing an orange flame on your gas furnace? If so, it could be a sign of a potential issue that requires some attention.

An orange flame in your gas furnace, instead of the normal blue flame, signals that your furnace may not be operating efficiently or safely. This color change often indicates incomplete combustion, potentially due to various issues such as a dirty burner, improper gas mixture, or insufficient air supply. Addressing this problem not only ensures the longevity and efficiency of your furnace but also safeguards your home against the risks of carbon monoxide poisoning.

In this guide, we will walk you through a step-by-step process of identifying the cause of an orange flame in your gas furnace and how to fix orange flame on gas furnace, ensuring your furnace returns to its optimal, safe operation.

What are the Benefits of a Blue Flame?

Before we discuss solutions, let’s first understand why a blue flame is the preferred color for gas furnaces. A blue flame indicates that your furnace is burning fuel efficiently and cleanly, maximizing its heating capabilities while keeping carbon monoxide emissions at a safe level. In contrast, an orange or yellow flame signifies incomplete combustion and can produce higher levels of carbon monoxide, which is harmful to humans and pets.

In addition to safety concerns, an orange flame can lead to decreased furnace efficiency and higher utility bills, as your furnace may need to work harder to produce the same amount of heat. By fixing the cause of an orange flame, you improve safety and potentially save money in the long run.

What Causes an Orange Flame in a Gas Furnace?

Now that we understand the importance of a blue flame let’s explore some common causes of an orange flame.

• Dirty Burner: One of the most common causes is a dirty burner, which can prevent proper mixing of air and gas, leading to incomplete combustion and an orange flame.
• Improper Gas Mixture: An issue with your gas supply, such as low pressure or a malfunctioning valve, can result in an improper gas mixture and cause an orange flame.
• Insufficient Air Supply: Your furnace needs adequate airflow to burn fuel efficiently. A clogged air filter or blocked vents can restrict the air supply and contribute to incomplete combustion and an orange flame.
• Blocked Flue: The flue removes exhaust gases from your furnace. If it becomes blocked, it can lead to a buildup of carbon monoxide and an orange flame.
• Faulty Parts: A malfunctioning sensor, control valve, or thermocouple can also result in an orange flame, as these parts are essential for proper combustion.

What Will You Need?

Before we get into the steps to fix an orange flame, you must gather some tools and supplies. These may include:

• Screwdriver
• A soft brush or compressed air
• Replacement parts (if necessary)

Once you have these items, you are ready to start troubleshooting and fixing your gas furnace’s orange flame.

10 Easy Steps on How to Fix Orange Flame on Gas Furnace

Step 1: Turn Off Your Furnace

Safety should always be your top priority when attempting to fix issues with your gas furnace. Before you start any work, ensure the furnace is completely turned off. This means turning off the power supply to the furnace, typically by switching off the circuit breaker or the emergency switch. If possible, close the gas valve to prevent any gas from flowing into the furnace while you are working on it. Taking these precautions helps eliminate the risks of accidents or gas leaks as you proceed with troubleshooting and repair.

Step 2: Inspect and Clean the Burner

With the furnace safely turned off, remove the access panel to locate the burner. Over time, burners can accumulate dust and debris, leading to blockages that affect the flame color. Use a screwdriver to gently remove the burner unit. Once removed, inspect it for any visible signs of dirt or corrosion.

Carefully clean the burner using a soft brush or compressed air, paying close attention to remove all debris and dust. If the burner appears severely corroded or damaged, consider replacing it with a new unit to ensure optimal performance. After cleaning (or replacing) the burner, securely place it back in the furnace, ensuring it is properly aligned and positioned.

Step 3: Check and Replace the Air Filter

A dirty or clogged air filter can significantly impact the efficiency of your furnace by restricting airflow and leading to incomplete combustion, which may result in an orange flame. Locate the air filter in a slot near the furnace blower. Slide out the old filter and assess its condition. If it’s visibly dirty or has been in use beyond its recommended lifespan, it’s time for a replacement. Ensure you choose the correct size and type of filter for your furnace model. Insert the new filter according to the airflow direction indicated on the filter’s frame. Replacing a clogged air filter can improve airflow and combustion, potentially correcting the orange flame issue.

Step 4: Examine the Gas Pressure and Valve Operation

Incorrect gas pressure or a malfunctioning gas valve can lead to an improper gas mixture, contributing to an orange flame. It’s essential to check the gas pressure and the operation of the gas valve. This step usually requires professional equipment and knowledge to accurately measure the gas pressure leading to your furnace. If you need to gain experience with gas systems, it’s recommended

to call a qualified technician to perform this check. If the gas pressure is found to be too low or the gas valve is faulty, adjustments or replacements will need to be made. Correcting these issues can help ensure that the gas mixture entering your furnace is at the proper ratio for efficient combustion.

Step 5: Verify Adequate Air Supply and Ventilation

After addressing the gas pressure and valve, the next vital step is ensuring your furnace receives sufficient air for combustion and that ventilation is unobstructed. Begin by inspecting the area around your furnace. Remove any items that could be blocking air intake or vents. Check the external air intakes and exhaust vents outside your home for any obstructions, such as bird nests, debris, or snow buildup,

which could impede airflow. Also, inspect the ductwork for leaks or blockages that restrict air movement. Ensuring adequate ventilation not only supports optimal combustion and the achievement of a blue flame but also enhances your furnace system’s overall safety and efficiency.

Step 6: Inspect the Flue for Blockages

The flue is crucial in safely venting exhaust gases out of your furnace. A blocked flue can lead to inefficient combustion and contribute to the issue of an orange flame. Inspect the flue with the furnace turned off for any signs of blockage. This can include bird nests, debris, or a buildup of soot. Depending on the location and design of your flue, this may require climbing onto the roof. If you’re uncomfortable

performing this task or require special equipment, consider hiring a professional to conduct the inspection. Remove any obstructions and ensure the flue is clear to allow for proper venting of gases. A clean and unblocked flue is essential for the efficiency and safety of your furnace.

Step 7: Check and Clean the Ignition System

A faulty ignition system can also lead to an orange flame, causing incomplete combustion. Begin by locating your furnace’s ignition system, which could be a pilot light or an electronic ignitor. For pilot systems, check if the pilot flame is blue and stable; if it’s yellow or flickering, this indicates dirt accumulation or a fault. Carefully clean the pilot orifice or ignitor with a soft brush or compressed air,

ensuring not damage any components. If the ignition system is electronic, look for signs of wear or damage and replace any faulty parts. A well-maintained ignition system is crucial for achieving efficient combustion and the ideal blue flame in your gas furnace.

Step 8: Schedule Regular Maintenance Checks

Regular maintenance by a qualified technician is essential to keeping your furnace running efficiently and safely. Even if you’ve successfully addressed the issue of an orange flame and your furnace seems to be operating normally, underlying problems may not be visible to the untrained eye. Scheduling annual or semi-annual maintenance checks can help identify and rectify potential issues before they lead to significant problems or system failures. During a maintenance check,

a technician will inspect your entire furnace system, perform necessary cleanings, and replace parts that are worn or on the verge of failing. Regular professional maintenance ensures your furnace operates at peak efficiency, extends its lifespan, and maintains a safe environment in your home.

Step 9: Monitor Furnace Performance and Flame Color

After completing the previous steps, it’s crucial to monitor your furnace’s performance and the color of the flame regularly. A healthy gas furnace flame should be a consistent blue with perhaps a small yellow tip. Observing the flame can provide immediate insights into your furnace’s condition and whether further adjustments or checks are needed. If the flame returns to an orange color or you

notice other signs of inefficient operation, such as unusual noises, a persistent gas odor, or higher than normal heating bills, it may indicate that the problem persists or there are other underlying issues. Consider revisiting the troubleshooting steps provided or consult a professional technician for further assessment and repair in such cases. Regular monitoring helps in the early detection of issues, preventing costly repairs and ensuring your furnace operates safely and efficiently.

Step 10: Consult with a Professional for Complex Issues

If, after following these troubleshooting steps, the orange flame issue remains unresolved, or if at any point you’re uncertain about the safety of performing a task, it’s crucial to consult with a professional HVAC technician. Complex furnace problems that persist beyond basic troubleshooting can signify deeper, potentially hazardous issues that require specialized knowledge and tools to address safely.

An experienced technician can comprehensively diagnose your furnace, pinpoint the root causes of the problem, and implement the appropriate solutions. Remember, while DIY maintenance can be effective for minor issues, professional intervention ensures that your furnace operates safely, efficiently, and complies with local codes and regulations.

5 Additional Tips and Tricks

1. Ensure Proper Ventilation: An orange flame could signal incomplete combustion due to poor ventilation. Check for blockages in the air intake and exhaust vents to ensure your furnace has adequate airflow.
2. Adjust the Air Shutter: The air shutter controls the air-fuel mixture. If the flame is orange, adjusting the shutter to allow more air into the mixture might be necessary, promoting a cleaner, bluer flame.
3. Inspect Fuel Quality: The gas quality can impact the flame color. Contaminants or a mix of different gas types can cause an orange flame. If you suspect this is the case, contact your gas supplier.
4. Use a Gas Leak Detector: A gas leak can also cause an orange flame. To ensure safety, use a gas leak detector to check for leaks in the furnace or surrounding areas.
5. Try Cleaning the Burners: Over time, dirt and debris can build up on the furnace burners, affecting the flame color. Regularly clean them with a soft brush or compressed air to improve combustion and achieve a bluer flame.

With these additional tips and tricks, you can further troubleshoot and fix an orange flame on your gas furnace.

5 Things You Should Avoid

1. Ignoring Manufacturer’s Instructions: Always consult your furnace’s owner manual before attempting any troubleshooting or repairs. Making adjustments without understanding your furnace’s specific requirements can lead to further damage or unsafe operating conditions.
2. Neglecting Regular Maintenance: Remedying an orange flame without addressing the underlying maintenance issues can be futile. Routine checks and cleaning are crucial for the furnace’s optimal performance and safety.
3. Overlooking Professional Help: While some fixes can be DIY, don’t hesitate to call a qualified technician for complex issues. Incorrectly adjusting components like the gas valve or air shutters can create dangerous situations.
4. Skipping Safety Precautions: Only attempt repairs after first turning off the gas and electricity to the furnace. Ignoring safety practices can result in serious injuries or even life-threatening accidents.
5. Using Inappropriate Cleaning Tools: Avoid using abrasive or harsh cleaning tools on the burners or other furnace components. Such tools can damage the furnace parts, affecting the flame color and furnace efficiency even further. Stick to soft brushes or compressed air as recommended.

By Avoiding these common mistakes, you can ensure your gas furnace operates safely and efficiently. Remember always to prioritize safety and consult a professional when in doubt.

What Chemical Makes an Orange Flame?

Orange flames are typically caused by incomplete combustion of natural gas primarily composed of methane. When there isn’t enough oxygen available for complete combustion, the flame turns orange due to the presence of carbon monoxide and other incomplete combustion byproducts.

These byproducts contain carbon compounds that emit a bright, orange-colored light when heated, giving the flame its distinct color. The presence of these compounds in the flame indicates that the furnace is not operating at its optimal efficiency and could potentially pose a safety risk. It’s important to address an orange flame promptly to prevent further damage or hazardous conditions. 

Overall, regular maintenance and proper troubleshooting can ensure your gas furnace operates safely and efficiently. A steady blue flame indicates complete combustion and optimal performance.

Is Orange Flame Incomplete Combustion?

Yes, an orange flame on a gas furnace is typically caused by incomplete combustion. This means that not all of the fuel is being burned completely due to a lack of oxygen or other factors. Carbon compounds in the flame indicate that complete combustion is not occurring and can lead to safety hazards and decreased efficiency. 

So it’s important to address this issue promptly through proper troubleshooting and maintenance.  Finally, always consider consulting a professional for complex issues to ensure the safety and efficiency of your furnace. 

With these tips and tricks, you can effectively troubleshoot and fix an orange flame on your gas furnace.

Conclusion

In conclusion, how to fix orange flame on gas furnace involves a combination of basic troubleshooting, regular maintenance, and potentially professional intervention. Starting with simple checks like ensuring proper ventilation, adjusting the air-fuel mixture through the air shutter, inspecting fuel quality, and cleaning the burners can address the common causes of an orange flame.

However, if these steps do not resolve the issue, it points to more complex problems that require the expertise of a professional HVAC technician. Remember, an orange flame is a sign of incomplete combustion, indicating that the furnace is not operating at peak efficiency and could produce harmful byproducts like carbon monoxide. Hence, addressing this issue is not just about maintaining the operational efficiency of the furnace but also ensuring the safety and well-being of all occupants in the home.

By following the correct procedures, consulting the manufacturer’s instructions, and seeking professional help when needed, you can ensure that your gas furnace operates safely, efficiently, and with the clean blue flame that signifies complete combustion.