Regular maintenance… A Final Word on Your Heating System. A dirty air filter can restrict airflow, causing the heat exchanger to get too hot, and in turn causing the fan limit switch to shut down the furnace. The furnace blowing cold air, or there is no heat in the house. If you notice your furnace blowing cold air... an increase in your utility bills... or can actually feel warm air coming from seals or joints in your ductwork... it’s time to investigate. Depending upon the age, condition and quality of the construction, your home’s ductwork may have some significant leakage. But that fan has two modes of operation: ON and AUTO. The first thing you have to do is check to see what type system you own. Closing too many vents may cause the furnace to adjust by cycling on and off more frequently, which can reduce overall comfort in the house and can shorten the life of the furnace. The air filtration system is designed not only to filter the air in the house but also to protect your system against dust build-up. If you have a gas furnace, a lack of fuel will cause the pilot light to go out. There’s also nothing like the disappointment of discovering your furnace blowing cold air inside when it’s turning cold outside. During the winter months, no one wants their furnace blowing cold air. This can cause your furnace to lock down for safety. Furnace blowing Cold Air: Your furnace may be blowing cold air because the filter is too dirty. We care for your comfort and so we care about your investment on your HVAC appliances.Reach us for a genuine quote and expert advice. Furnace still blowing cold air? Many furnace models include a fan limit switch with a function called “blower on delay”. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Here is a guideline to help you troubleshoot and possibly solve the issue. Changing the fan setting to auto will turn off the blower when the system is not actively heating. Furnace Blowing Cold Air! An old or dirty flame sensor will cause your furnace to blow cold air, too. When it is chilly, having a heater that is not working is a major cause of concern. If you’ve checked all of the easy-to-remedy reasons that can result in your furnace blowing cold air and you still haven’t solved the problem, it may be time to contact your local Carrier® indoor comfort expert to see if your furnace needs to be serviced, adjusted or replaced. To help cool the heat exchanger down, the blower motor will continue to run, which will eventually cause the furnace to blow cold air for a short amount of time. It is also possible that the cold air in the attic mixes with the warm air and cold air results when the heating is on. It is usual for cold air to enter the heating system until it is warm, and then for warm air to continue to blow after the air heats up. Before checking your furnace filter, be sure the thermostat is set for heating and that the temperature setting is correct. Simply turn your system on, and hold your hand over joints, connections, or anywhere you can visibly see a seal in the ductwork. Is the fan set to run constantly, even when the system isn’t heating the air? If you have made some of the described adjustments and your system does not respond, it may be time to contact your local Carrier HVAC expert for a professional analysis of your system’s operation. It is, therefore, likely to have the ventilation ducts repaired to resolve the problem. Learn how to choose and maintain your HVAC system. If the fan limit switch malfunctions, the blower might continue to operate even when the furnace is not heating the air resulting in your furnace blowing cold air from your registers. It is usual for cold air to enter the heating system until it is warm, and then for warm air … 10 Common Reasons Why Your Furnace is Blowing a Cold Air Read More » If a thermostat is set incorrectly, you might notice your furnace blowing cold air from the heat registers, a lower than expected temperature reading on the thermostat, or you may even hear your air conditioner running outside. This operation must be carried out every year by a professional heating engineer. Because a functioning flame sensor and a malfunctioning flame sensor can both result in a furnace shutting down, it may be best to contact an expert to determine why your system isn’t functioning properly. Furnaces can overheat for a variety of reasons, including: If you continue to have problems associated with duct leakage or your furnace blowing cold air, an HVAC professional can provide a more sophisticated analysis and duct sealing options for ducts that are not easily accessible. This helps to prevent natural gas (or propane) from continuing to flow into the home’s air supply. A friend of ours bought a new house recently. Have you ever turned on your heat after turning it off for months, only to find that cold air was blowing because you still have it on the cold air setting? What Is the Cost to Buy or Replace a Home Furnace? Press J to jump to the feed. Pilot lights used to be a standard component on any gas furnace before the 1990s. 7 Possible Reasons Your Home Heater/Furnace Is Blowing Cold Air. If you notice the air temperature in your home is cooler than normal... if the airflow from your heat vents seems to be weaker than usual... and/or if you hear the furnace running for short periods of time before shutting down (short cycling), you may have a dirty air filter to blame. though several reasons can cause this problem, there are a few things you can do before you call a professional. If the gas pressure is low, the pilot may shut down. One of the main culprits of cold airflow is an improperly set thermostat. If you suspect your furnace is overheating, it will start blowing cool air to lower the temperature to a safe level. Check your air filter, and clean or replace if needed. This is a common problem with homes in the United States. However, this occurs more often than people think and can result from a plethora of different issues. Check the owner’s information for your furnace to see if there should be a blower delay after the burner kicks on. Its responsibility is to eliminate water that is made during the warming cycle. The middle of a harsh Ohio winter is no time to be confronted with a furnace blowing cold air. Note that cleaning of the ventilation ducts may be required. Lack of maintenance can lead to build-up of dirt, dust and other airborne pollutants that can clog your filter, restrict airflow and lead to both discomfort or in more extreme cases, system failure. Those who have any heating system in their home should know that their design needs to be serviced. Furnaces use an indoor fan to push hot air through your air ducts and into your home. 10 Common Reasons Why Your Furnace is Blowing Cold Air, 8540 Keele St., Unit 41, Vaughan, ON, L4K 2N2, Copyright © 2020 | Smile HVAC Service and Installation, 31-32, 8600 Keele st, Vaughan, ON L4K 4H8, filter needs to be replaced more frequently. The thermostat is the first place to check when the furnace is blowing only cold air. Check Your Air Filter. If, after a few minutes you still experience the furnace blowing cold air, you may need to contact your HVAC contractor. Compromised flame sensor. A furnace that isn’t getting fuel will not ignite and will blow only cold air. Check on the side of your furnace for instructions. Check the temperature setting to make sure somebody else didn’t change it to a lower setting. Wi-Fi® models offer remote access to change your settings from a computer or mobile device anywhere you have access to the internet. Is there a worse time for your furnace to start blowing cold air in your Georgetown home than on a cold winter night? In the future, perform annual furnace maintenance to make sure it is ready for use in cold weather. User account menu • Furnace Blowing Cold Air! Your gas supply could be turned off. There could be several reasons for this, so it’s always a good idea to troubleshoot your furnace, especially as it can help the heating engineer who eventually will be needed to repair your appliance. And, if your furnace does have a pilot light ignition, it may be time to consider upgrading to a new, pilotless gas furnace. The fan setting on your thermostat has two options, “on” and “auto”. However, furnaces are “sized” to efficiently deliver comfort to the entire home. Here are some of the common and uncommon reasons we see furnaces blowing cold air. Or the gas line isn’t supplying enough gas to your furnace. If you only have a furnace and the ventilation works only in winter and don’t have pets, replace it once a year. Having a professional heating engineer examine the furnace may solve the problem. save. If your furnace is blowing cold air, or is not operating at all, a component called the fan limit switch may have malfunctioned. Settings. 0:00. Some will continue to use their system year after year without worrying about maintenance, and when the system fails, that’s when they realize care is a problem. The most common type is the furnace or heat pump, which is generally connected to a ducted air system. Your thermostat has an ON and AUTO switch that runs your blower. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. Note that the filter needs to be replaced more frequently in new construction due to interior finishing work while the system is in operation. This means that when the furnace is on, only cold air will come out through the vents. Incorrect thermostat settings... a wave of cool air from your heat vent before the warm air arrives... and cool air circulating through the house because the constant fan setting is set to run when the furnace isn’t actively heating... these are all common reasons for a heating system blowing cold air. A full, clogged filter reduces airflow and minimizes system performance. Major duct problems. Learn about our innovative products and how they can help improve your comfort. If you experience any of these symptoms in your home, the first step is the check the thermostat and look for the obvious answers. If you have exposed ductwork, typically in a basement or crawlspace, checking for leaks can be relatively easy. Start by checking the indoor regulator to ensure the fan setting isn’t in the “ON” position. All you have to do is switch the thermostat to the AUTO position. This short delay is intended to keep you more comfortable by eliminating an initial blast of cold air from your heat vents. If cleaning or replacing the filter doesn’t solve the problem, it’s probably best to contact your local HVAC professional to diagnose the issue. Replacing the sensor should be a fairly easy fix for your contractor as well. Have an expert inspect your ducts along with the furnace. If you notice a room is too cold or hot... inconsistent temperatures in different areas of your home... the temperature reading on your thermostat doesn’t match the temperature you set... or if your furnace is constantly turning on and then back off after a short time (short cycling), you may have too many closed vents. If your furnace is still blowing cold air, it sounds like you’re going to need some professional help to get things working. It's also possible that the furnace's pilot light isn't well shielded. Most pilot lights are fairly simple to reignite. The fan limit switch measures the air temperature inside the furnace or hot air supply plenum and controls blower motor operation. Although not an issue for natural gas customers, if you use heating oil, it’s best to check the fuel level. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Common Reasons: Thermostat. Over time, dust and dirt will accumulate within your gas or oil burner, which can cause trouble in igniting. Always check your thermostat first if your furnace is blowing cold air. Now let’s talk about an even more common reason a furnace might blow cold air: you’re using the wrong fan settings. Because a pilot light is designed to burn continuously, it also uses more of your gas supply, which can be reflected in higher utility bills. Serviced regularly can result from a plethora of different issues many furnace models include a fan motor to stop.. 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