Failure of the transformer that provides power to the thermostat can also … Your furnace’s limit switch, which specifically works as a safety measure, has turned your furnace burners off until the unit reaches a safe temperature. But if you’ve set your fan to be “on” at all times, it’ll blow cold air during the furnace downtime. Depending on the type of burner you have, it isn't uncommon to experience any of the issues listed above. Although you can do this yourself, we recommend calling a professional as there may be another underlining problem. The oil from your fingers can cause permanent damage to the part. Changing your filter is a good starting point, but if the problem persists we have other options for you to troubleshoot. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Also, if your oil burner isn't functioning correctly you should check for a clogged filter. In some cases, you may be able to fix the problem yourself. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. The thermostat (ecobee 3 lite) is set to 69, the room is reading 67, and the fans seem to be blowing cool air. Check to see if one of these troubleshooting tips fixes the issue. This usually arises if you haven’t changed your air filter routinely. Depending on the age of your system and its model, you may have to manually relight it yourself or you may only need to push a button. This means the fan will run continuously without providing heat. Leaky ductwork can cause serious issues for your heating system. When the filter is clogged, ignition can be affected and the result is your heating not blowing hot air. Have your system professionally cleaned to take care of this problem. In most situations, it's best to enlist the help of a professional to fix this problem. Read on to learn the 13 most common reasons for your furnace blowing cold air and when to call for a furnace repair. Or, if your system has not been cleaned in a while, a valve could be stuck due to dirt and debris. Heat Pump Troubleshooting: 3 Common Problems and Solutions, The Rewards of Giving Back: Arista Team Rebuilds a Home in Puerto Rico, Commercial Refrigeration Service & Repair. When your furnace is blowing cold air your warm and inviting home can turn into an icebox in a matter of hours! If it stays lit, you should be back in business. It restricts the airflow in and out of your furnace, which can cause this issue. Warm air is sent through your ducts when the thermostat says it’s needed. The flame sensor itself is relatively easy to clean, but many homeowners are uncomforable working on their furnaces. Mechanic's Assistant: Have you checked the coolant level? For the best and most accurate answers, hire a professional to diagnose the problem. Details More often than not, electric heaters blow cold air when its filters are clogged, and that's why it's the first thing you should check. The pilot light is another common culprit of gas furnace problems. If you have an older furnace with a continuous pilot light, the pilot may have gone out. The best service providers can customize a plan for your needs and your budget. Salons & Spas: Improve Indoor Air Quality to Keep Customers Safe, COVID Prevention & Air Quality Technology Shown 99.9% Effective. If you have an oil-fired furnace, you may be out of fuel. If this is the case, you can simply switch the setting from "on" to "auto" and your problem should be fixed. Your furnace may be blowing cold air … Many of the causes of furnace problems can be prevented with regularly-scheduled cleaning and maintenance. If the filters are caked with dust, then it's likely the culprit behind your heater's malfunction. Fortunately, this is usually an easy fix. If you find that you go to bed comfortable and wake up freezing because instead of your heater delivering warm air, it's blowing cold, it might be because the condensate drain has frozen. Do you have thermostat wars going on in your office? And if it's the dead of Winter, this can be a serious problem that needs immediate attention. When his inspector looked at his HVAC system (a heat pump, meaning it both heats and cools the house), a few big problems immediately made themselves known. They may even need to run a static pressure test during their assessment. The furnace will be more likely to pull in sediment from the tank, which can clog your air filter. If the switch is in the ON position, then the blower keeps running, even when the furnace is not heating. Use care not to touch an HSI when troubleshooting or installing a new one. Schedule service Troubleshooting tip #1: Check the thermostat If your furnace blows hot air sometimes and cool air at other times, … This too can cause your heater to blow cold air. If the flame sensor is dirty, it will produce inaccurate readings which can cause heating issues. The thermocouple is a sensor that controls the gas valve and ignition. You can easily fix this problem by thawing the condensate, but you'll need to take long term measures to prevent the issue from happening again. Furnace Blowing Cold Air? If your blower does not shut off and it’s not blowing cold air, then that means the burner is still lit. When this happens, … Top 3 Reasons a Furnace Blows Cold Air #1 – Your Thermostat Is in the ON Position. Check your thermostat. Compromised flame sensor. Consult an HVAC expert for advice. If you choose to call a professional to do the job for you, this would be a good time to have your system inspected. If you do manage to relight the pilot but it keeps going out, a faulty thermocouple is likely causing your furnace to blow cold air. Before calling for repairs, check your fuel level. Have you changed your air filter lately? A furnace that blows cold air could also indicate that it is overheating. But you need to know when to call in the furnace repair pros so you don’t have to spend unnecessary time in the cold and interrupt your business. That’s why the furnace is not blowing hot air. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack. Check the owner’s information for your furnace to see if there should be a blower delay after the burner kicks on. There are four main components of a furnace. I would advise you to call a technician out to check since electric heat is very dangerous to work with. The fuel system, the burners, the fan and the ductwork. If after refilling the tank your furnace doesn't turn on, it may be necessary to manually bleed and restart your furnace. The fan setting on your thermostat has two options, “on” and “auto”. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. When the furnace is turned on after a certain period, whether it be days, weeks or months, turning on the system does not mean that warm air will automatically begin to pass through the vents. As your oil or gas-powered furnace heats the air, condensation is created. Is your furnace not blowing hot air? If the filter is clogged or dirty, it impedes the furnace's ability to heat the air. This problem requires a visit from your HVAC repair technician. Next, use fine-grit sandpaper to remove any oxidation from the tip of the pilot, and reattach the pilot tube to the furnace. If your furnace has a fan control, it may be adjustable. 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 » There's a lot of issues that can cause your ducts to leak. Solution: Turn your thermostat’s fan setting to AUTO. The thermocouple is a sensor that regulates ignition, and if it requires adjustment or replacement your furnace will blow cold air. 11. If you have a newer furnace with an electronic ignition, such as an intermittent pilot or a hot surface ignition, your system may need adjustments or replacement of failed parts. To mitigate carbon monoxide and puff backs, an internal motor kicks on and creates a vacuum just before the burner engages. But, of course, there are many other possible causes. You’ll need a visit from an HVAC professional to make this furnace repair. You might be suprised to learn that one of the most common residential HVAC issues is the thermostat. But before you call for help, you might be able to do some simple troubleshooting and save yourself a little money by fixing it yourself. Seals breakdown, the constant pull of gravity, rodents, incorrect installation, and even age can play havoc when it comes to delivering hot air. Mechanic's Assistant: What is the make/model of your '16 RV? The “on” setting means that the furnace fan will be running even when the furnace itself is off. Your furnace blowing cold air could be caused by hot air escaping through holes in the duct work that carries the heat throughout your building. This means that your electric heat strips are not coming on. It doesn’t seem possible, but a surprising amount of cold air blows in around electrical outlets. Hi all, I think our thermostat/furnace isn't working properly. Your furnace may be blowing cold air because the pilot light has gone out. Use a wrench or pliers to remove the pilot tube. This is usually a simple fix, but you’ll need to call a technician to adjust or replace it. This will eliminate the risk of freezing. Once the vacuum is created, the vacuum switch sends a signal for the furnace to ignite. During cold weather, you want to be sure that your furnace is blowing plenty of hot air. You do not want the blower to stop if the burners are still lit. If you're lucky, the problem may be as simple as changing a fuse on the circuit board. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. Dust and debris inside the thermostat can cause it to malfunction. Pilotless furnaces have been an energy-saving breakthrough for the home and commercial heating industries. Count your blessings that this time you avoided an expensive furnace repair. 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