Common Causes and Solutions
If you’ve noticed your furnace blowing cold air, you’re likely wondering what went wrong and how to fix it. A furnace that blows cold air can be frustrating, especially during the colder months when you rely on it the most. Fortunately, there are a few common reasons for this issue, and many can be resolved quickly with a bit of troubleshooting or by calling in an expert. In this post, we’ll explore why your furnace might be blowing cold air and what you can do about it.
1. Thermostat Issues
The first thing to check if your furnace is blowing cold air is your thermostat settings. Sometimes, the thermostat could be set to “cool” mode, or it may be malfunctioning.
What to do: Ensure your thermostat is set to “heat” mode and that the temperature is set high enough to trigger your furnace. If this doesn’t solve the issue, the thermostat may need to be recalibrated or replaced.
2. Dirty Air Filter
A clogged or dirty air filter can restrict airflow in your furnace. This often causes your system to overheat, which can result in it shutting down or blowing cold air.
What to do: Regularly check and replace your air filter. In general, you should replace the air filter every 1-3 months, depending on usage and the type of filter you use.
3. Pilot Light or Ignition Problems
If your furnace uses a pilot light, it could have gone out, causing it to blow cold air. For furnaces with electronic ignition, a faulty ignition system could be the culprit.
What to do: Check the pilot light to see if it’s lit. If it’s out, follow your manufacturer’s instructions to relight it. If your furnace uses an electronic ignition, you may need to contact a professional to inspect the system.
4. Blower Motor Issues
The blower motor in your furnace is responsible for circulating air throughout your home. If this motor malfunctions, your furnace can blow cold air.
What to do: If you suspect the blower motor is malfunctioning, it’s best to contact a professional HVAC technician for a thorough inspection and repair. Blower motor problems are complex and require expertise to fix.
5. Pilot Light or Flame Sensor Malfunction
In some cases, a malfunctioning flame sensor can prevent the furnace from properly heating the air. If the flame sensor is dirty or defective, your furnace may blow cold air or fail to start altogether.
What to do: If cleaning the flame sensor doesn’t resolve the issue, it might need to be replaced. A qualified HVAC technician will be able to take care of this for you.
6. Gas Supply Issues
Another common reason for a furnace blowing cold air is a gas supply problem. If the gas valve is turned off, or there’s a gas leak, your furnace won’t be able to generate heat.
What to do: Ensure the gas valve is fully open and there’s no gas leak. If you suspect a gas leak or another issue with the gas line, contact a professional HVAC company like Family Heating and Cooling immediately.
What to Do if Your Furnace Is Blowing Cold Air
If you’ve gone through the troubleshooting steps above and your furnace is still blowing cold air, it may be time to call in an expert. At Family Heating and Cooling, we provide fast and reliable heating services in New Bedford, Fall River, Taunton, Dartmouth, Somerset, and Fairhaven. Whether it’s fixing a malfunctioning thermostat, changing the air filter, or diagnosing more complex issues with the blower motor or ignition system, we’re here to help.
Don’t let a cold house ruin your comfort—contact us for professional furnace repair and maintenance. We also offer comprehensive HVAC maintenance plans to keep your furnace running smoothly year-round.
FAQs
Should I turn my heat off if it’s blowing cold air?
If your furnace is blowing cold air, it’s usually a sign of an issue that needs addressing. Rather than turning the heat off, first check the thermostat settings to make sure it’s properly set to “heat.” Additionally, inspect the air filter for any clogs or dirt. A clogged filter can cause airflow problems, leading to cold air blowing from your vents. If the problem persists, it’s best to contact a professional to inspect and repair your furnace.
How to reset a furnace?
To reset your furnace, locate the reset button, usually found near the furnace control panel. Press and hold the button for about 10 seconds, then release it. If the furnace continues to blow cold air or doesn’t turn on, it may indicate a more serious issue, like a malfunctioning ignition system or a blocked vent. In this case, it’s recommended to have a professional technician inspect the system.
How to reset a thermostat?
If your furnace isn’t responding, resetting the thermostat can sometimes resolve the issue. Start by turning off the thermostat, waiting for a few minutes, then turning it back on. For programmable thermostats, check to ensure that the settings are correct. If the furnace continues to blow cold air, your thermostat might need calibration, replacement, or professional repair.
How to tell if your furnace is venting properly?
Proper venting is essential for your furnace’s safety and efficiency. If your furnace is venting poorly, you may notice signs like unusual smells, an unexplained shutdown, or condensation around the vent. You should also check for any blockages in the vent pipe, which can cause the furnace to malfunction or even create a dangerous carbon monoxide buildup. If you’re unsure about the venting system, it’s important to have a professional check it to ensure it’s working safely.
Where is the furnace filter located?
The furnace filter is typically located near the air intake on your furnace or in the return air duct. Depending on your model, it can be found in the blower compartment. It’s essential to check and replace the filter every few months, as a dirty or clogged filter can restrict airflow and lead to furnace problems, such as blowing cold air. Regular maintenance can help keep your system running smoothly.
If you’re experiencing any of these issues or need expert furnace repair or maintenance services, don’t hesitate to contact Family Heating and Cooling for reliable, professional service.
