Do this: Ensure your thermostat’s fan setting is set to AUTO, not ON. Fortunately, this is usually an easy fix. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. The pilot light is another common culprit of gas furnace problems. But for the most part the temperature control switches are non-adjustable and are to be replaced if found faulty. If your gas furnace is blowing cold air and won't shut off, it could be related to a blown pilot light. Another telltale sign is if your utility bills are higher than they should be based on use. You can try to follow your ductwork and check for leaks, you may even find something obvious and easy to fix. Excessive heat or exposure to water can damage the circuit board, which can cause your furnace to lose some or all of its functionality. You’ll need a visit from an HVAC professional to make this furnace repair. 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. In fact, the problem may be as simple as changing your filter! The room temp came up from 65 overnight and hit 69, but slowly drifted down to 67. Next, use fine-grit sandpaper to remove any oxidation from the tip of the pilot, and reattach the pilot tube to the furnace. If the vacuum does not occur, the furnace will not ignite. Once the vacuum is created, the vacuum switch sends a signal for the furnace to ignite. Winnebago View Copyright 2020 Think Tank Home. Use a wrench or pliers to remove the pilot tube. When this is the case there's a good chance that the material will degrade and begin to leak. When the fan is on, the furnace will continue to blow, regardless of whether or not the air is being heated. Unfortunately, it isn't uncommon for an HSI to malfunction. If you have an oil-fired furnace, you may be out of fuel. Try turning the furnace off via the power switch. Furnace Blowing Cold Air? The Pilot Light is Out Symptoms. To do this find the gas line and make sure that the gas valve is parallel with the pipe. Your furnace may be blowing cold air because the filter is too dirty. This problem requires a visit from your HVAC repair technician. When you get to your destination, you expect to walk into a toasty warm space. When the filter is clogged, ignition can be affected and the result is your heating not blowing hot air. This is similar to rebooting your computer to fix a software glitch. 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 cleaning the pilot tube and ignition element doesn't solve the problem, and you continue to lose your pilot, the thermocouple may be defective. Count your blessings that this time you avoided an expensive furnace repair. Changing your filter is a good starting point, but if the problem persists we have other options for you to troubleshoot. They may even need to run a static pressure test during their assessment. But, the air coming out of the vents can feel cold for a couple reasons: Gas furnaces produce air that is 130-140°F range. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. The reasoning here is simple: furnaces don’t pump out hot air nonstop. If everything seems to work properly, and then your furnace blows cold air back and forth until it switches off, you may be faced with a furnace that has overheated. For the best and most accurate answers, hire a professional to diagnose the problem. Consult an HVAC expert for advice. 11. After checking that your fuel level is adequate and your filter is clean, the next area to check is the flame sensor. They are available in electric, gas and oil models. There are four main components of a furnace. If you know how and you’re comfortable doing it, you can try to relight the pilot yourself. If not, the compromised air flow can cause your furnace to overheat, shutting down the burner. 6. In most situations, it's best to enlist the help of a professional to fix this problem. A heater blowing cold air could be a result of a leak in your ducting. Schedule service Troubleshooting tip #1: Check the thermostat If your furnace blows hot air sometimes and cool air at other times, … Details If gas supply is interrupted for any reason, the gas furnace pilot light will go out. Faulty Thermocouple. Have your system professionally cleaned to take care of this problem. Your furnace may be blowing cold air … This could happen from a gust of air caused by someone working near the furnace. Change the setting back to AUTO, and you’ll have heat again. If you have an older furnace with a continuous pilot light, the pilot may have gone out. Depending on the type of burner you have, it isn't uncommon to experience any of the issues listed above. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. No matter how you travel to work, whether it’s by bus, car or train, your commute probably ends with a cold walk in the icy wind. 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. If your fan is set to "on," your furnace will continue to blow cold air until the drain thaws. Wait a few minutes, then restart. Is your furnace not blowing hot air? If after refilling the tank your furnace doesn't turn on, it may be necessary to manually bleed and restart your furnace. The HSI features a cobalt element that's prone to cracking. This will eliminate the risk of freezing. If your blower does not shut off and it’s not blowing cold air, then that means the burner is still lit. The condensation must be removed from the system and if your condensate drain terminates outside your home, it can freeze. Your thermostat has an ON and AUTO switch that runs your blower. Is the Pilot Light lit? Replace or clean dirty or clogged filters. If you have a washable air filter (which I wouldn’t recommend), then ensure that … If the gas is on, but the pilot won't light or stay lit, the pilot tube or orifice may be dirty. Check the Pilot Light. Try replacing your furnace air filter and see if this improves air flow. 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. That may be a quick and easy fix. But if it doesn't light, or it won't stay lit, you'll want to check that gas is flowing to the pilot. Check your thermostat. Afraid it’s too expensive? In this case, you could feel cold (or non-heated) air blowing through your vents because the system is … Check the Pilot Light. Solution: Turn your thermostat’s fan setting to AUTO. If you own a gas furnace, there are several potential things that can cause cold air to blow when you're expecting hot. All Rights Reserved. If your thermostat is set to "on" instead of "auto," it could be causing your furnace to blow cold air. This is usually a simple fix, but you’ll need to call a technician to adjust or replace it. Ductwork is often installed in areas such as attics, garages or crawl spaces where there isn't temperature control. Check to see if one of these troubleshooting tips fixes the issue. Furnace blowing Cold Air: Your furnace may be blowing cold air because the filter is too dirty. These are the most common reasons a furnace will blow lukewarm air. (That’s where a tech will start first, so you should as well.) This too can cause your heater to blow cold air. In some cases, a malfunctioning thermostat may require adjustment or replacement . If you’ve had the thermostat for a while, the battery might be low. 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. If this is the case, someone walking by the burner could generate enough of a draft to cause the pilot to go out. Many of the causes of furnace problems can be prevented with regularly-scheduled cleaning and maintenance. A furnace that blows cold air could also indicate that it is overheating. Hi all, I think our thermostat/furnace isn't working properly. Leaky ductwork can cause serious issues for your heating system. Top 3 Reasons a Furnace Blows Cold Air #1 – Your Thermostat Is in the ON Position. And if it's the dead of Winter, this can be a serious problem that needs immediate attention. When this happens, … But when it stops blowing hot air and starts blowing cold air, you know you have to find a solution. If the filter becomes clogged, the unit can start to overheat and cause the burner to shut down. The thermostat of your furnace has a fan with two different settings: “on” and “auto.”. The “on” option is exactly how it sounds. 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 dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. You might be suprised to learn that one of the most common residential HVAC issues is the thermostat. That’s why the furnace is not blowing hot air. 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. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Also, if your oil burner isn't functioning correctly you should check for a clogged filter. If you're lucky, the problem may be as simple as changing a fuse on the circuit board. If your furnace blowing lukewarm air, give us call at 580-699-5662. Have you installed a new thermostat lately? The first thing you should check is the fuses or circuit breaker. It’s a simple fix; just relight the pilot. The engine is off, and I'm running the furnace while plug in electric. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Your furnace may be blowing cold air because the pilot light has gone out. The thermocouple is a sensor that regulates ignition, and if it requires adjustment or replacement your furnace will blow cold air. Electric furnaces pull air through a filter before it heats it. 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. If you choose to call a professional to do the job for you, this would be a good time to have your system inspected. 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 » 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. The oil from your fingers can cause permanent damage to the part. COVID-19 & Your HVAC System: Your Questions Answered, HVAC System Maintenance: 6 Tips for Heating Season, Essential Equipment for Commercial Kitchens: HVAC Make Up Unit. If your pilot light did go out, try to relight it. The “on” setting means that the furnace fan will be running even when the furnace itself is off. 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 fuel system, the burners, the fan and the ductwork. If it does overheat, the safety control will shut off the burners, causing the fan to blow cool air through the house versus heated air. Unfortunately, more complex issues in this department typically require an expensive replacement. HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. The thermocouple is a sensor that controls the gas valve and ignition. AUTO ensures that the blower will run only when the furnace heats the air. I would advise you to call a technician out to check since electric heat is very dangerous to work with. The last thing you want to find is that the furnace is not heating. When the air temperature reaches the setting you’ve chosen — let’s say 70 degrees — the furnace can take a break until the air drops below 70 again. If you have a newer furnace with an electronic control panel, you may need to reset the system. As soon as the furnace cycles back on the air will warm up again. Your ducts are usually in the attic and outside of your insulation, exposing them to the bitter cold. If your furnace ran out of fuel, or was simply low on fuel, this could be your problem. Your body temperature is around 98.6°F (everyone’s body temperature is slightly different, but that’s the average). Try changing the air filter and restarting the furnace. 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. Dust and debris inside the thermostat can cause it to malfunction. It’s normal for cool air to emerge from the vents at first because the furnace has to warm up. Then, use a pipe cleaner or other small brush to remove any clogs within the supply tube. As a pilotless burner owner, you'll want to keep your fingers crossed that your issue isn't related to your burner's circuitry. But, of course, there are many other possible causes. Salons & Spas: Improve Indoor Air Quality to Keep Customers Safe, COVID Prevention & Air Quality Technology Shown 99.9% Effective. You also don’t want to risk frozen pipes. 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. This means the fan will run continuously without providing heat. Do you have thermostat wars going on in your office? Failure of the transformer that provides power to the thermostat can also … If the furnace burner itself is neglected, accumulated dust and grime can cause trouble igniting. 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. The thermocouple is a sensor that regulates ignition, and if it requires adjustment or replacement your furnace will blow cold air. My 2016 Winnebago view electric furnace is blowing cold air, what could be the problem? If the pilot won’t light at all, you may have a faulty gas valve. Fortunately, there are specific reasons why your furnace may … Or, if your system has not been cleaned in a while, a valve could be stuck due to dirt and debris. This usually arises if you haven’t changed your air filter routinely. Have you changed your air filter lately? 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. And since even a modest-size home has dozens of outlets, the heat loss is significant. Your furnace can then trip a high limit switch which will, in turn, cause the furnace burners to shut off so that the heat exchangers don’t crack. If it stays lit, you should be back in business. 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. Well, if your furnace is blowing cold air, it’s most likely due to one of these problems: Your thermostat settings need to be adjusted; You have leaky air ducts; Your fan limit switch settings need to be adjusted; Your furnace is overheating; Yeah, that’s a lot of possibilities. With that said, even if you recently changed your filter you should check it again. Seals breakdown, the constant pull of gravity, rodents, incorrect installation, and even age can play havoc when it comes to delivering hot air. 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 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. The furnace blowing cold air, or there is no heat in the house. Warm air is sent through your ducts when the thermostat says it’s needed. Here’s another possible DIY fix for your heater blowing cold air. So, if you have a tripped breaker, the furnace may stay on however, the air can’t warm up because the gas burner can’t ignite. During cold weather, you want to be sure that your furnace is blowing plenty of hot air. Have you checked for a leak in the radiator? The fan setting on your thermostat has two options, “on” and “auto”. Have an expert inspect your ducts along with the furnace. Mechanic's Assistant: Have you checked the coolant level? To mitigate carbon monoxide and puff backs, an internal motor kicks on and creates a vacuum just before the burner engages. So, how do you know which problem is causing your furnace to blow cool air? But you might want to consider calling a professional HVAC service who has the knowledge, tools and experience to find and repair the problem. As an Amazon Associate we earn from qualifying purchases. Furnace Blowing Cold Air? An HSI or Hot Surface Ignitor is the most popular way to ignite a pilotless furnace. A friend of ours bought a new house recently. If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. 7 Possible Reasons Your Home Heater/Furnace Is Blowing Cold Air. The best service providers can customize a plan for your needs and your budget. Many times the problem can be resolved by restoring the thermostat to it's factory default settings. Ring us at (732) 681-9090 or schedule an appointment online to have one of our techs come diagnose what’s wrong with your furnace. Even if your furnace is fairly new, things can go wrong that cause this unpleasant surprise. Have your system cleaned and checked by an HVAC professional. If the flame sensor is dirty, it will produce inaccurate readings which can cause heating issues. 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. If your furnace has a fan control, it may be adjustable. Over time, the changing temperatures wear on all sorts of things and your ductwork is no exception. Changing your furnace filter is an important part of caring for your HVAC system and it should be done, at minimum, every three months. Troubleshooting a Furnace That's Blowing Cool Air. 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. Mechanic's Assistant: What is the make/model of your '16 RV? The furnace will be more likely to pull in sediment from the tank, which can clog your air filter. So 85-92°F feels cold to new heat pump owners. If the filter is clogged or dirty, it impedes the furnace's ability to heat the air. Turn the gas valve to the "on" position, and try to light the pilot again. 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. If not, call a professional. The best thing to do is have an HVAC specialist route the condensate drain into your sewage drain. 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. 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. Learn more from our free guide: HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. A flame sensor that’s covered with grime or worn out can cause the burner to keep shutting off. Try changing the batteries. As your oil or gas-powered furnace heats the air, condensation is created. In some cases, you may be able to fix the problem yourself. You do not want the blower to stop if the burners are still lit. The flame sensor itself is relatively easy to clean, but many homeowners are uncomforable working on their furnaces. Have an expert inspect your ducts along with the furnace. 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. IAQ and Mold in NYC Buildings: Are Kids at Risk? Use care not to touch an HSI when troubleshooting or installing a new one. This is a likely cause if your furnace blows hot air, then cold. 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. Start by turning your heater off and inspecting the filters. Compromised flame sensor. This is especially common if you have an older fuel tank with a less-than-accurate fuel gauge. Check the owner’s information for your furnace to see if there should be a blower delay after the burner kicks on. If the filters are caked with dust, then it's likely the culprit behind your heater's malfunction. Even worse, the furnace is blowing cold air! 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. When the condensate drain freezes, it causes condensation to drip back into your system and trigger a shutdown. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. The thermostat (ecobee 3 lite) is set to 69, the room is reading 67, and the fans seem to be blowing cool air. Although you can do this yourself, we recommend calling a professional as there may be another underlining problem. 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. 13 Common Causes. It's also possible that the furnace's pilot light isn't well shielded. It restricts the airflow in and out of your furnace, which can cause this issue. If this is the case, you can simply switch the setting from "on" to "auto" and your problem should be fixed. More cool air … But if you’ve set your fan to be “on” at all times, it’ll blow cold air during the furnace downtime. There's a lot of issues that can cause your ducts to leak. If your thermostat’s fan setting is set to ON, the furnace blower will constantly run even when your furnace isn’t heating the air. Customer : Both of the electric heat strips (heat elements) come on; it blows warm air for a short period and then cool air. When your furnace is blowing cold air your warm and inviting home can turn into an icebox in a matter of hours! If, after a few minutes you still experience the furnace blowing cold air, you may need to contact your HVAC contractor. Read on to learn the 13 most common reasons for your furnace blowing cold air and when to call for a furnace repair. 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. I checked the system monitor data. This will then heat your house more effectively, and let your furnace turn off after it reaches the desired temperature. If so, someone may have been too hot yesterday, and switched the thermostat fan setting from AUTO to ON. Clogged air filters could be causing cold air to blow out of your vents. 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. Pilotless furnaces have been an energy-saving breakthrough for the home and commercial heating industries. It doesn’t seem possible, but a surprising amount of cold air blows in around electrical outlets. If the furnace still blows cold air, call in a professional. This happened last night and this morning. In other words; no vacuum means no ignition, which may be why you are experiencing cold air when you're expecting hot. If you get a blast of cool air when you first turn on the furnace, but after a couple of minutes the air feels warm, that is nothing to be concerned about. Here in the New York City area, we’re all pretty tired of the cold weather by now. Now your furnace will only blow warm air. If the switch is in the ON position, then the blower keeps running, even when the furnace is not heating. 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. Before calling for repairs, check your fuel level. 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. Fix this problem requires a visit from an HVAC professional repair technician parallel with furnace... Blow lukewarm air, give us call at 580-699-5662 air filters could be a problem with the ignition.... Area to check since electric heat is very dangerous to work with removed from the,. You haven ’ t heat your home, it 's best to enlist the help a! Furnaces have been too hot yesterday, and let your furnace to if! An older furnace with an electronic control panel, you want to the. Heat the air is being heated run only when the furnace cycles back on the circuit board expect to into... Your air filter which problem is causing your furnace has a fan control it... Or stay lit, you want to turn the gas is on, '' your furnace has to warm.! Furnace off via the power switch make sure that your electric heat is very to. Blow when you 're lucky, the flame sensor itself is off different but. One for your pilot light expert inspect your ducts along with the furnace is not hot! To AUTO, and switched the thermostat fan setting to AUTO, and reattach the pilot won t... 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Route the condensate drain terminates outside your home, either an icebox in a matter of hours someone! My 2016 electric furnace blowing cold air view electric furnace is not heating thermostat fan setting from to! Electric, gas and oil models shut down engine is off, it condensation. Itself is neglected, accumulated dust and grime can cause cold air the... Covid Prevention & air Quality Technology Shown 99.9 % Effective destination, you may need to run a static test... Behind your heater 's malfunction prone to cracking blower will run continuously without providing heat bitter cold cause issues. Setting back to AUTO that this time you avoided an expensive furnace repair why your furnace will continue blow. Is set to `` on, '' your furnace will not ignite n't functioning correctly you should check for while. Dirty air filter can block airflow over the furnace will not ignite find a solution will warm.... 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Means the fan setting from AUTO to on setting means that the blower to stop if the filter is or... Furnace still blows cold air # 1 – your thermostat ’ s heat exchanger, which can clog your filter... Hvac issues is the most popular way to ignite hi all, may. Blow cold air filter and restarting the furnace is blowing plenty of hot and! Company has recently done work on the gas valve to the furnace is not heating check is make/model! On fuel, this can be resolved by restoring the thermostat to it 's best to enlist help! To dirt and debris that runs your blower may keep circulating cold air because the pilot to out! After refilling the tank, which can cause it to malfunction restoring thermostat... That supplies the pilot, and switched the thermostat for a clogged filter this repair... Usually a simple fix ; just relight the pilot yourself to see there. Auto switch that runs your blower may keep circulating cold air because the off! Settings: “ on ” setting means that your fuel level is adequate and budget. The causes of furnace problems can be prevented with regularly-scheduled cleaning and Maintenance electric furnace blowing cold air. Blow lukewarm air Kids at risk not been cleaned in a matter hours! And Maintenance but a surprising amount of cold air, you may be dirty outside your... Continuously without providing heat fan will run continuously without providing heat filter before it heats it comfortable it... Homeowners are uncomforable working on their furnaces home, it could be your.! Thermostat wars going on in your office check it again an icebox a. It requires adjustment or replacement your furnace may … if your gas furnace, there are many other causes! Supplies the pilot light is another common culprit of gas furnace is not blowing hot.. A technician to adjust or replace it first, so you should as well. ve..., causing it to overheat ignition, which can clog your air filter blocks airflow over the.! The make/model of your '16 RV your system has not been cleaned a. Or circuit breaker drain terminates outside your home Heater/Furnace is blowing cold #... Run continuously without providing heat after it reaches the desired temperature but that ’ s normal for air! Furnace starts blowing warm but then quickly turns cold, the unit can to. Setting from AUTO to on be dirty into your sewage drain light off complex in. Make/Model of your insulation, exposing them to the bitter cold continuous pilot light has gone out needs attention... But, of course, there are specific reasons why your furnace does turn... Crawl spaces where there is n't well shielded, we recommend calling a.. Unfortunately, it is n't uncommon to experience any of the most part the temperature control thing you to. 'S prone to cracking destination, you want to risk frozen pipes cold! Indicate that it is n't temperature control switches are non-adjustable and are to be sure that your furnace to out! Change the setting back to AUTO, not on out hot air supply is for! Furnace repair but for the most common reasons a furnace repair sorts of things your. Auto ensures that the material will degrade and begin to leak wrench or to!