If this is the case, someone walking by the burner could generate enough of a draft to cause the pilot to go out. Do you have cold air blowing out of vents when heat is on? Furnace Blowing Cold Air? Another common reason your furnace is blowing cold air is that your flame sensor is dirty.. Have your system professionally cleaned to take care of this problem. If you know how, you can clean or replace the filter yourself, but it’s messy and not as easy as an air filter so you may want to leave this job to the pros. And if it's the dead of Winter, this can be a serious problem that needs immediate attention. If. 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. Here are the reasons your system is not producing warm air, and what to do. Every thermostat has two air blower settings: auto and on. In most cases, it’s best to have a professional identify the problem and repair your furnace. In addition, there are a few problems that are unique to pilotless furnaces which you'll want to look into if the troubleshooting tips above don't fix your problem. If you own an electric furnace and it's blowing cold air there's a few things that could be causing the problem. If you suspect that ice is the problem, then wrap the condensate line with heat tape and pipe insulation. Outside of a heating cycle, the furnace could be blowing cold air because of a settings mistake. If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. If you've recently had an electric power surge or any other power issue, the fix could be as simple as replacing a fuse or flipping the circuit breaker. Overheated furnace. With that said, even if you recently changed your filter you should check it again. There’s only one thing worse than a furnace not working, it’s a furnace blowing cold air. In case of severed line case you’ll need some professional help. 4. In such cases, if your fan is still running, it could cause the system to blow out cold air, instead. If the flame sensor is dirty, it will produce inaccurate readings which can cause heating issues. In most situations, it's best to enlist the help of a professional to fix this problem. These Common Issues May be the Reason, AC Evaporator Coils: Everything You Need to Know, AC Compressor Not Working but Fan is Running, Evaporator Coil Leak: What You Need to Do, Looking for A Portable Air Conditioner That Doesn’t Need A Window, Why Your Furnace is Short Cycling and What to Do About It, Best 50 Gallon Electric Water Heaters: Our Top Picks. Check the furnace’s air filter. Unfortunately, it isn't uncommon for an HSI to malfunction. To mitigate carbon monoxide and puff backs, an internal motor kicks on and creates a vacuum just before the burner engages. Fill up the empty oil tank and try restarting your furnace. A flame sensor that’s covered with grime or worn out can cause the burner to keep shutting off. Consult an HVAC expert for advice. It’s possible your furnace overheated. To fix this issue is simple, just flip the fan switch from “ ON ” to “ AUTO .”. The cold air you feel is from the fan blowing it in because it is always running. Your gas supply could be turned off. Here are 6 common reasons for a furnace blowing cold air, and what you should do about it: 1. Check for instructions on how to ignite your model’s pilot light. Major duct problems You’ll need a visit from an HVAC professional to make this furnace repair. As your oil or gas-powered furnace heats the air, condensation is created. If your gas furnace is blowing cold air and won't shut off, it could be related to a blown pilot light. However, if that line gets blocked, water backs up into the furnace, causing an overflow kill switch to shut down the furnace to prevent water damage. When the burners of your furnace are clogged, there won’t be enough fuel for your furnace to keep blowing out hot air. Common causes of condensate blockage are: Besides blockages, the condensate overflow may also be caused by a broken condensate pump. If you cannot relight the pilot, check your gas supply. If you haven’t done that yet this winter, call in an HVAC service expert to keep your system in top shape and prevent unexpected failures. This will eliminate the risk of freezing. When your heater isn’t working properly and is blowing cold air, don’t despair. The cool air is not necessarily a sign that you need to replace your furnace. At first, you may think the furnace will stop blowing cold air on its own, but after several minutes you realize that something is wrong and that the furnace is not going to fix itself. If you have an oil-fired furnace, its filter can become clogged with dirt and debris, just like an air filter on a gas-fired system. Funny as it may sound, a system set to “on” will not necessarily blow warm air. If those flames fail to ignite, the furnace needs to know to close the valves so you aren’t pouring natural gas into the furnace. 2) Furnace overheated Let’s say your furnace blows hot air, then cold air, but then stops blowing any air at all after a while. If you’re comfortable doing so, just follow the manufacturer’s instructions for how to re-light it safely. The condensation must be removed from the system and if your condensate drain terminates outside your home, it can freeze. Cold air trapped inside will need to be expelled before the hot air can take its place! The heat exchanger uses natural gas instead of oil as its fuel source. Ice (only during cold snaps and if the line runs through an unconditioned space). As an Amazon Associate we earn from qualifying purchases. Your furnace may be blowing cold air because the filter is too dirty. Ductwork is often installed in areas such as attics, garages or crawl spaces where there isn't temperature control. if it is, clean it to allow gas to come through. Don’t freeze on days and nights you should be warm and cozy. When an oil furnace blows cold air the problem could be the result of one of the following reasons: It may seem silly, but you'd be surprised at how many people's furnace problems are simply a case of running out of oil. Another telltale sign is if your utility bills are higher than they should be based on use. If the gas is on, but the pilot won't light or stay lit, the pilot tube or orifice may be dirty. That may be a quick and easy fix. If you have an oil-fired furnace, you may be out of fuel. During cold weather, you want to be sure that your furnace is blowing plenty of hot air. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. If you’ve ever worked in an office where someone has cranked the AC way up high to the discomfort of others, then you know where this is going. Troubleshooting Furnaces Not Blowing Hot Air. Excessive heat or exposure to water can damage the circuit board, which can cause your furnace to lose some or all of its functionality. ThermostatLab helps you to simplify your decision in order to choose the best thermostat in the industry, we provide all the exclusive reviews about thermostat so that you can easily pick the best. Changing your filter is a good starting point, but if the problem persists we have other options for you to troubleshoot. Furnace blowing Cold Air: Your furnace may be blowing cold air because the filter is too dirty. Icy cold air blowing from your vents on an already cold night is a dreadful experience. If you're lucky, the problem may be as simple as changing a fuse on the circuit board. The first thing you should check is the fuses or circuit breaker. The best thing to do is have an HVAC specialist route the condensate drain into your sewage drain. Why Is My Furnace Running but Not Blowing Hot Air? 5. Consult your users manual for directions on restoring the settings for your specific unit. 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. If you have an older furnace with a continuous pilot light, the pilot may have gone out. If the vacuum does not occur, the furnace will not ignite. Check The Thermostat. If your gas furnace seems incapable of blowing hot air, the problem could be with the ignition system. If your fan is set to "on," your furnace will continue to blow cold air until the drain thaws. This is a likely cause if your furnace blows hot air, then cold. To do this find the gas line and make sure that the gas valve is parallel with the pipe. If you own a gas furnace, there are several potential things that can cause cold air to blow when you're expecting hot. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. If you haven’t been regularly checking and changing your air filter, it’s most likely extremely clogged. If the pilot won’t light at all, you may have a faulty gas valve. What To Do When The Furnace Is Not Blowing Hot Air. Also, if your oil burner isn't functioning correctly you should check for a clogged filter. Although you can do this yourself, we recommend calling a professional as there may be another underlining problem. After checking that your fuel level is adequate and your filter is clean, the next area to check is the flame sensor. There's a lot of issues that can cause your ducts to leak. Or, it may prevent the furnace from operating at all. Try changing the air filter and restarting the furnace. Relight it and wait for a few minutes. If your heater stops blowing after a short period or starts emitting cold air, it might be a good idea to check if the furnace is working fine. What’s the problem? But you might want to consider calling a professional HVAC service who has the knowledge, tools and experience to find and repair the problem. Why Furnaces Blow Cold Air & What To Do Next. The HSI features a cobalt element that's prone to cracking. 1) Change the furnace’s air filter if it’s dirty If it is, the problem might be a simple thermostat setting. Copyright 2020 Think Tank Home. When the fan is on, the furnace will continue to blow, regardless of whether or not the air is being heated. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Try changing the batteries. Inadequate gas supply. Then, use a pipe cleaner or other small brush to remove any clogs within the supply tube. if the switch is on, then check to see if the pilot light is dirty. Also read: Furnace Duct Cleaning: Know About Their Pros and Cons. Or, if your system has not been cleaned in a while, a valve could be stuck due to dirt and debris. A clogged filter will restrict air flow into your home. Regular maintenance can prevent HVAC problems like your furnace blowing cold 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 … In other words; no vacuum means no ignition, which may be why you are experiencing cold air when you're expecting hot. 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. 2. Because the work involved is technical, trying a do-it-yourself replacement could do you more harm than good. Your System Was Just Turned On. 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