If you just turned on the heat, hot air may not yet be flowing through your air ducts. Next, use fine-grit sandpaper to remove any oxidation from the tip of the pilot, and reattach the pilot tube to the furnace. It's also possible that the furnace's pilot light isn't well shielded. This “hot then cold air” sequence happens over and over and your home isn’t warming up. The HSI features a cobalt element that's prone to cracking. If the flame sensor is dirty, it will produce inaccurate readings which can cause heating issues. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 4. Whipple Service Champions is a leading furnace repair service in Salt Lake County . Check The Thermostat. Your furnace clicks on and the blower motor is running, but the air coming from the vents is cold or cool instead of hot. This can cause your furnace to lock down for safety. Fortunately, there are specific reasons why your furnace may not … Check to see if one of these troubleshooting tips fixes the issue. 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. 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. When considering whether to purchase a gas furnace or oil furnace, homeowners should consider where their home’s location and their heating needs. If you haven’t been regularly checking and changing your air filter, it’s most likely extremely clogged. If you have a high-efficiency furnace and you see water pooling around the furnace. Here is a guide to show you how your furnace should be working and tips to … If you choose to call a professional to do the job for you, this would be a good time to have your system inspected. 1) Change the furnace’s air filter if it’s dirty When it’s cold outside, the last thing you want to find is cold air coming out of your furnace when it’s supposed to be heating your home. If you did it yourself instead of calling a professional, you may have chosen a thermostat that’s not compatible with your heating system. The cool air is not necessarily a sign that you need to replace your furnace. If this is the case, you'll first want to turn the gas valve that supplies the pilot light off. Consult your users manual for directions on restoring the settings for your specific unit. All Rights Reserved. In other words; no vacuum means no ignition, which may be why you are experiencing cold air when you're expecting hot. 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. Turn the gas valve to the "on" position, and try to light the pilot again. Last update on 2020-12-29 / Affiliate links / Images from Amazon Product Advertising API. 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. Regular maintenance can prevent HVAC problems like your furnace blowing cold air. There could be a few reasons why your furnace is chilling the room. Do this: Turn off your furnace at the thermostat These 5 fixes can solve most furnace problems without you needing to pay for a repairman to come out. Here are some possible reasons your furnace is blowing cold air: The furnace is overheating Pilotless furnaces have been an energy-saving breakthrough for the home and commercial heating industries. In fact, the problem may be as simple as changing your filter! So if you feel the air blowing out of the vents while the furnace is off, the air will seem cool since it’ll be at about room temperature. Unfortunately, it isn't uncommon for an HSI to malfunction. This guide will tell you what you need to know if that happens. Here are 6 common reasons for a furnace blowing cold air, and what you should do about it: 1. When it is chilly, having a heater that is not working is a major cause of concern. Funny as it may sound, a system set to “on” will not necessarily blow warm air. When the condensate drain freezes, it causes condensation to drip back into your system and trigger a shutdown. Don’t freeze on days and nights you should be warm and cozy. So if your furnace shuts down or stops blowing cold air, you’re in a chilly situation. Every thermostat has two air blower settings: auto and on. Somebody else is adjusting the thermostat . If not, the compromised air flow can cause your furnace to overheat, shutting down the burner. With the AUTO setting chosen, your furnace should only run the fan during a heating cycle and not push cold air through your vents in between. Write CSS OR LESS and hit save. 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. Furnace Blowing Cold Air? They are available in electric, gas and oil models. To protect the heater from malfunctioning altogether, engineers embed automatic limit switches that are responsible for turning the heat-generating furnace off. If your pilot light did go out, try to relight it. The flame sensor itself is relatively easy to clean, but many homeowners are uncomforable working on their furnaces. In most situations, it's best to enlist the help of a professional to fix this problem. Your gas supply could be turned off. The furnace will be more likely to pull in sediment from the tank, which can clog your air filter. This is usually a simple fix, but you’ll need to call a technician to adjust or replace it. Have You Been Changing Your Furnace Filter? I’d watched the repair guy do his 10 minute job, and it didn’t look difficult at all. While in some cases, you’ll need a professional the fix the pump. Once the vacuum is created, the vacuum switch sends a signal for the furnace to ignite. 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. It generates heat through ductwork in the home by using a pilot light connected to a thermostat that homeowners can set to regulate the temperature in their homes. If you own an electric furnace and it's blowing cold air there's a few things that could be causing the problem. Therefore, set your fan to “auto” to coordinate it with the furnace and you’ll just have hot air blowing, not cold. 2. You may have a thermocouple-related problem, meaning the component needs adjusting or replacing. Changing your filter is a good starting point, but if the problem persists we have other options for you to troubleshoot. 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. If the gas is on, but the pilot won't light or stay lit, the pilot tube or orifice may be dirty. What To Do When The Furnace Is Not Blowing Hot Air. Make sure the furnace’s gas valve switch is in the “on” position (parallel/in line with the gas supply pipe. How to Troubleshoot a Furnace Blower That Runs No Heat. When the filter is clogged, ignition can be affected and the result is your heating not blowing hot air. As an Amazon Associate we earn from qualifying purchases. Have an expert inspect your ducts along with the furnace. If you have an oil-fired furnace, you may be out of fuel. You might be suprised to learn that one of the most common residential HVAC issues is the thermostat. In most cases, it’s best to have a professional identify the problem and repair your 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. In such cases, if your fan is still running, it could cause the system to blow out cold air, instead. As your oil or gas-powered furnace heats the air, condensation is created. 2. Solution 3: If the pilot lights, but won’t stay lit, then there’s a problem with the thermocouple (the copper rod you see the pilot flame hitting). Improper Thermostat Settings. After checking that your fuel level is adequate and your filter is clean, the next area to check is the flame sensor. Have your system professionally cleaned to take care of this problem. Also read: Furnace Duct Cleaning: Know About Their Pros and Cons. Ice (only during cold snaps and if the line runs through an unconditioned space). Or the gas line isn’t supplying enough gas to your furnace. Some reasons your furnace is blowing cold air: You might have walked by a vent and noticed the air seemed cool. if it is, clean it to allow gas to come through. If the flame goes out, then all is not well. If the furnace burner itself is neglected, accumulated dust and grime can cause trouble igniting. We will examine the most common issues that cause your furnace to blow lukewarm air, including: Unfortunately, more complex issues in this department typically require an expensive replacement. I’m honestly not trying to insult your intelligence, but you’d be shocked at how many times we’ve gotten a call to come out when a furnace won’t turn off, only to find out that it was really a cold-war between the wife who likes it at 80 degrees and the husband who likes it at 68. If you own a gas furnace, there are several potential things that can cause cold air to blow when you're expecting hot. Copyright 2020 Think Tank Home. Excessive heat or exposure to water can damage the circuit board, which can cause your furnace to lose some or all of its functionality. If you're lucky, the problem may be as simple as changing a fuse on the circuit board. If your thermostat is set to "on" instead of "auto," it could be causing your furnace to blow cold air. Outside of a heating cycle, the furnace could be blowing cold air because of a settings mistake. 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. After ruling out all of the ‘simple’ problems above, the most likely cause of a furnace not blowing air is a problem with the blower fan itself which, if you remember, … If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. If you’re comfortable doing so, just follow the manufacturer’s instructions for how to re-light it safely. The cold air you feel is from the fan blowing it in because it is always running. But my furnace was blowing hot air, and my family wasn’t complaining any more, so I didn’t complain either… at least not out loud. This could happen from a gust of air caused by someone working near the furnace. Seals breakdown, the constant pull of gravity, rodents, incorrect installation, and even age can play havoc when it comes to delivering hot air. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. If you’ve had the thermostat for a while, the battery might be low. If cleaning the pilot tube and ignition element doesn't solve the problem, and you continue to lose your pilot, the thermocouple may be defective. A flame sensor that’s covered with grime or worn out can cause the burner to keep shutting off. Your furnace may or may not be blowing cold air if your ductwork is leaking, but you may have noticed it more challenging to keep one or two rooms warm. We strive to provide the best possible customer service experience for each of our customers. The thermocouple is a sensor that controls the gas valve and ignition. You can avoid expensive repairs by troubleshooting furnace problems before calling a professional. Your furnace may be blowing cold air because the filter is too dirty. Also, if your oil burner isn't functioning correctly you should check for a clogged filter. Why Furnaces Blow Cold Air & What To Do Next. Because the work involved is technical, trying a do-it-yourself replacement could do you more harm than good. That’s why the furnace is not blowing hot air. During cold weather, you want to be sure that your furnace is blowing plenty of hot air. Overheated furnace. This is due to the programmed settings of a furnace system, which gauge the temperature within a living quarter and only disperse heat until the preset temperature is reached. You might not think your filter contributes to your AC not blowing cold air, but it does. They may even need to run a static pressure test during their assessment. A furnace that frequently shuts off automatically may have other issues, such as a clogged air filter or blocked ducts that are causing the furnace to overheat. However, fixing the problem can be easier than you think. Fill up the empty oil tank and try restarting your furnace. In such a case, your heater is not lighting the fuel, as a result of which it cannot heat your home. As a pilotless burner owner, you'll want to keep your fingers crossed that your issue isn't related to your burner's circuitry. If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. What’s the problem? Changing your furnace filter is an important part of caring for your HVAC system and it should be done, at minimum, every three months. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. You’ll need a visit from an HVAC professional to make this furnace repair. Inadequate gas supply. There's a lot of issues that can cause your ducts to leak. If the furnace still blows cold air, call in a professional. If the furnace turns on but no heat comes out, it will be a cold night. That’s why the furnace is not blowing hot air. When the fan is on, the furnace will continue to blow, regardless of whether or not the air is being heated. This is especially common if you have an older fuel tank with a less-than-accurate fuel gauge. though several reasons can cause this problem, there are a few things you can do before you call a professional. Check for instructions on how to ignite your model’s pilot light. Once its lit, if it doesn’t stay lit, it may need some routine maintenance from an HVAC professional. That may be a quick and easy fix. Use care not to touch an HSI when troubleshooting or installing a new one. Make sure the gas valve is switched on. When the burners of your furnace are clogged, there won’t be enough fuel for your furnace to keep blowing out hot air. In case of severed line case you’ll need some professional help. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. When high-efficiency furnaces run, they create water (condensate), which is emptied out a drain line. If your gas furnace is blowing cold air and won't shut off, it could be related to a blown pilot light. The oil from your fingers can cause permanent damage to the part. Solution 2: If the pilot refuses to light, ensure that gas is flowing into the furnace. 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. If. The first thing you should check is the fuses or circuit breaker. If after refilling the tank your furnace doesn't turn on, it may be necessary to manually bleed and restart your furnace. 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. It’s Just Been Switched On – Any furnace will blow cold air when it starts up, since it takes time for hot air to travel through the system and into your home. If this is the case, someone walking by the burner could generate enough of a draft to cause the pilot to go out. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. Consult an HVAC expert for advice. Although you can do this yourself, we recommend calling a professional as there may be another underlining problem. Let’s look at some of the solutions to this common furnace problem. If this doesn't resolve your cold air problem it could be the themostat itself, but before calling a professional, we recommend trying the other troubleshooting suggestions first. If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. 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. If you suspect that ice is the problem, then wrap the condensate line with heat tape and pipe insulation. Is your furnace not blowing hot air? When your heater isn’t working properly and is blowing cold air, don’t despair. To do this find the gas line and make sure that the gas valve is parallel with the pipe. If it is, the problem might be a simple thermostat setting. Check the furnace’s air filter. 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! Have you installed a new thermostat lately? If so, the limit switch, a furnace safety device, turned the furnace burners off. But is your home staying warm, at the temperature you set it at? Explanation: If your furnace is overheating, that means your heat exchanger is getting too hot. If your fan is set to "on," your furnace will continue to blow cold air until the drain thaws. If your gas furnace seems incapable of blowing hot air, the problem could be with the ignition system. To fix this issue is simple, just flip the fan switch from “ ON ” to “ AUTO .”. When your furnace is blowing cold air your warm and inviting home can turn into an icebox in a matter of hours! A furnace blowing cold air is indicative of a problem. Ductwork is often installed in areas such as attics, garages or crawl spaces where there isn't temperature control. Leaky ductwork can cause serious issues for your heating system. A gas furnace is a type of heating system. The pilot light is another common culprit of gas furnace problems. With that said, even if you recently changed your filter you should check it again. Try changing the air filter and restarting the furnace. Solution 1: Relight the furnace pilot light. 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. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Many times the problem can be resolved by restoring the thermostat to it's factory default settings. Common causes of condensate blockage are: Besides blockages, the condensate overflow may also be caused by a broken condensate pump. 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. Try changing the air filter and restarting the furnace. 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. Make sure the switch is set to AUTO, not ON. Another common reason your furnace is blowing cold air is that your flame sensor is dirty.. 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 your thermostat’s fan setting is set to ON, then your furnace blower will constantly be operating ever when it is not putting warm air into your home. These components typically have a 3 to 5 year service life, so it's a good idea to keep a spare on hand for when it inevitably needs to be replaced. Then, use a pipe cleaner or other small brush to remove any clogs within the supply tube. Alternatively, you can call your local utility company or an HVAC technician to make sure it is lit safely. Your furnace might lock down for safety reasons if it is not getting the amount of gas it requires to provide warm air. The blower motor itself does not … The reason your furnace is not blowing hot air could be something very simple or a reason to call for service. Check the Service Door It is possible—particularly if you’ve recently changed your furnace filter or done other maintenance—that the door to your furnace has been left open or closed improperly. heater is not lighting the fuel, as a result of which it cannot heat your home, Ducane Furnace Reviews [Models and Prices]. If this is the case, you can simply switch the setting from "on" to "auto" and your problem should be fixed. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. Your furnace may be blowing cold air because the filter is too dirty. This will eliminate the risk of freezing. Clean it to ensure proper gas flow. Go to your thermostat and take a look at the fan setting. If you cannot relight the pilot, check your gas supply. But if it doesn't light, or it won't stay lit, you'll want to check that gas is flowing to the pilot. One of the most common causes of a furnace blowing cold air is not actually a repair at all. To mitigate carbon monoxide and puff backs, an internal motor kicks on and creates a vacuum just before the burner engages. If the flame stays on, great! But you might want to consider calling a professional HVAC service who has the knowledge, tools and experience to find and repair the problem. You’ll find the instructions on the unit itself or in the user’s manual provided. Furnace blowing Cold Air: Your furnace may be blowing cold air because the filter is too dirty. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. The longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. An HSI or Hot Surface Ignitor is the most popular way to ignite a pilotless furnace. If you have an older furnace with a continuous pilot light, the pilot may have gone out. And if it's the dead of Winter, this can be a serious problem that needs immediate attention. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. It’s possible your furnace overheated. Use a wrench or pliers to remove the pilot tube. There’s only one thing worse than a furnace not working, it’s a furnace blowing cold air. 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. This is a likely cause if your furnace blows hot air, then cold. If you notice your furnace only blows cold air on occasion but your home is still maintaining its temperature than this may be simply a setting on your thermostat. 5. If your furnace is blowing cold air, not blowing any air at all, or making odd noises, it’s important to schedule a repair as soon as possible. It needs to be adjusted or replaced. 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. Is your “furnace not blowing out hot air”? If not, the compromised air flow can cause your furnace to overheat, shutting down the burner. Another telltale sign is if your utility bills are higher than they should be based on use. Check your thermostat and make sure that it is set to “auto” rather than “on.” When set to “on”, the fan on your furnace will blow continually, even when the furnace isn’t actually heating the air. Solution. Then the furnace’s condensate line (usually a PVC pipe) may be blocked, which causes the furnace to shut down. How a furnace works is that a spark or flame ignites the gas that heats the coils in your unit.. Do you have cold air blowing out of vents when heat is on? The heat exchanger uses natural gas instead of oil as its fuel source. Your furnace might be running just fine, but the air blowing out of your vents feels cold. 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. If your gas supply is not turned off, then you probably have a severed line. Icy cold air blowing from your vents on an already cold night is a dreadful experience. But I was complaining a little on the inside. If it is, you probably have a dirty pilot light. Try changing the batteries. Why Is My Furnace Running but Not Blowing Hot Air? Relight it and wait for a few minutes. Have your system cleaned and checked by an HVAC professional. This results in your furnace not heating up the coils. Have you changed your air filter lately? If the vacuum does not occur, the furnace will not ignite. Depending on the type of burner you have, it isn't uncommon to experience any of the issues listed above. If your furnace ran out of fuel, or was simply low on fuel, this could be your problem. Or, if your system has not been cleaned in a while, a valve could be stuck due to dirt and debris. Have you changed your air filter lately? A clogged filter will restrict air flow into your home. If it stays lit, you should be back in business. Your furnace may or may not be blowing cold air if your ductwork is leaking, but you may have noticed it more challenging to keep one or two rooms warm. The best thing to do is have an HVAC specialist route the condensate drain into your sewage drain. When it gets cold enough outside that you need to turn on your heating system, the last thing you expect is to find that your furnace is blowing cold air. Check your air filter, and clean or replace if needed. Extinguished pilot light. Another telltale sign is if your utility bills are higher than they should be based on use. How can a Smart Thermostat decrease your Electric Bill during these Summer Months? Here are the reasons your system is not producing warm air, and what to do. 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. If you don’t feel comfortable doing this, then contact a professional. Troubleshooting Furnaces Not Blowing Hot Air. Or, it may prevent the furnace from operating at all. Many of the causes of furnace problems can be prevented with regularly-scheduled cleaning and maintenance. When this is the case there's a good chance that the material will degrade and begin to leak. 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. Before calling for repairs, check your fuel level. Major duct problems 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. CTRL + SPACE for auto-complete. Your System Was Just Turned On. But when it stops blowing hot air and starts blowing cold air, you know you have to find a solution. The thermocouple is a sensor that regulates ignition, and if it requires adjustment or replacement your furnace will blow cold air. If the pilot won’t light at all, you may have a faulty gas valve. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not …
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