Why Is My Rv Furnace Blowing Cold Air

Why is My RV Furnace Blowing Cold Air?

If you’re an RV owner, you know how important it is to have a properly functioning furnace when embarking on your adventures. However, there might come a time when you turn on your RV furnace and it starts blowing cold air instead of warm air. This can be quite frustrating, especially when you’re expecting cozy warmth during your camping trips. But why does it happen? Let’s explore some possible reasons why your RV furnace might be blowing cold air and how you can fix the issue.

1. Thermostat settings:

One of the most common reasons for your RV furnace blowing cold air is incorrect thermostat settings. It’s essential to double-check the temperature setting on your thermostat to ensure it is set to the desired temperature. Sometimes, the settings may have been accidentally changed, resulting in the furnace blowing cold air. Make sure the thermostat is set to “Heat” mode and set to the temperature you want. This simple step can often resolve the issue quickly.

2. Ignition or flame sensor issues:

Another reason for your RV furnace blowing cold air could be ignition or flame sensor issues. Over time, the ignitor or flame sensor in your furnace can become dirty or corroded, leading to problems with the ignition process. This can cause the furnace to shut down before it can produce any warm air. Consider cleaning or replacing the ignitor or flame sensor to resolve the issue. It’s recommended to consult the furnace manufacturer’s manual for proper cleaning instructions or contact a certified technician for assistance.

3. Propane supply:

The propane supply is another crucial factor to consider when your RV furnace is blowing cold air. If your propane tank is empty or the supply is low, the furnace may not receive enough fuel to produce warm air. Monitor the propane levels regularly and ensure the tanks are properly connected. If the propane supply is low, refill or replace the tank as needed. It’s also a good idea to check for any leaks in the propane system, as these could also affect the furnace’s performance.

4. Airflow restrictions:

Sometimes, restricted airflow can be the reason behind your RV furnace blowing cold air. Check the air filters in your furnace to see if they’re dirty or clogged. Dirty filters can obstruct proper airflow, preventing the furnace from heating adequately. Clean or replace the filters regularly to ensure optimum performance. Additionally, check for any obstruction in the vents or ducts that could restrict the airflow. Clearing any blockages can help restore the proper airflow and solve the issue of cold air blowing from the furnace.

5. Electrical or wiring problems:

Electrical or wiring issues can also contribute to your RV furnace blowing cold air. If there’s a problem with the electrical connection or the wiring within the furnace, it may not function correctly. Inspect the electrical connections and wiring for any loose or damaged components. Ensure all connections are secure and there are no visible signs of damage. If you’re unsure about dealing with electrical repairs, it’s best to consult a qualified professional to avoid any safety hazards.

6. Malfunctioning blower motor:

A malfunctioning blower motor can also cause your RV furnace to blow cold air. The blower motor is responsible for circulating warm air throughout your RV’s ductwork. If it is not functioning properly, the warm air may not reach the desired areas, resulting in cold air blowing from the furnace. Check the blower motor for any signs of damage or wear and tear. Lubricate the motor as per the manufacturer’s instructions to ensure smooth operation. If the motor is severely damaged, it might need replacement by a professional technician.

7. Insufficient power supply:

In some cases, an insufficient power supply can cause your RV furnace to blow cold air. If the furnace is not receiving enough power, it may not function properly, resulting in inadequate heat production. Monitor the battery levels in your RV and ensure they are fully charged. Check the electrical connections and inspect the fuses for any signs of damage. If you suspect an issue with the power supply, seek assistance from a knowledgeable RV technician to diagnose and fix the problem.

Frequently Asked Questions For Why Is My Rv Furnace Blowing Cold Air

Why Is My Rv Furnace Blowing Cold Air?

Your RV furnace may blow cold air due to various reasons such as a malfunctioning thermostat, dirty filters, or a problem with the ignition system. It is important to diagnose the issue and seek professional help if needed.

How Can I Fix My Rv Furnace Blowing Cold Air?

To fix your RV furnace blowing cold air, you can start by checking the thermostat settings, cleaning or replacing the air filters, and ensuring the propane supply is adequate. If the issue persists, it is recommended to contact a qualified technician for further inspection and repair.

What Are The Common Causes Of An Rv Furnace Blowing Cold Air?

Common causes of an RV furnace blowing cold air include a faulty thermostat, clogged air filters, ignition system problems, low propane pressure, or a broken blower motor. Identifying the specific cause will help in resolving the issue effectively.

Can A Dirty Filter Cause My Rv Furnace To Blow Cold Air?

Yes, a dirty filter can cause your RV furnace to blow cold air. When the air filter gets clogged with debris, it restricts the airflow, preventing the furnace from heating up properly. Regularly cleaning or replacing the air filter can help prevent this issue.

Should I Attempt To Fix My Rv Furnace Blowing Cold Air On My Own?

While it is possible to fix minor issues with your RV furnace blowing cold air on your own, it is generally recommended to seek professional assistance. HVAC systems can be complex, and improper troubleshooting or repair attempts may cause further damage or safety hazards.

It is best to rely on experts for reliable and safe solutions.


When your RV furnace starts blowing cold air, it can put a damper on your camping experience. By understanding some common causes of this issue, such as thermostat settings, ignition problems, propane supply, airflow restrictions, electrical or wiring problems, malfunctioning blower motors, and insufficient power supply, you can work towards finding a solution. Remember to consult the manufacturer’s manual for troubleshooting tips or seek professional help when needed. With proper maintenance and prompt attention to any furnace issues, you can ensure a cozy and enjoyable camping adventure with a warm and efficient RV furnace.

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