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