furnace blowing cold air sometimes

By | December 30, 2020

There is nothing more disheartening than to discover my own heat furnace blowing cold air in the middle of the winter months. These become clogged sometimes, so you need to ensure that you are changing them regularly. A dirty air filter can sometimes cause the furnace to overheat. Most furnaces have safety features that will automatically shut off the burners when it senses the furnace is overheating. If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. Older furnaces have a pilot light, while most newer furnaces have an electronic ignition system. 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. One of the most common causes of a furnace blowing cold air is not actually a repair at all. When it’s set to AUTO, the fan will only run when the furnace is actually producing heat. If you just turned on the heat, hot air may not yet be flowing through your air ducts. https://youtu.be/ssI_YCnnF4Q2. During that time, the gas valves might have closed, broken, or clogged. Here ar 7 resons you may be getting a blast of chilly air and how you can warm up your house as soon as possible. How to test Pressure Switch! If the limit switch is broken or not operating properly, the fan can turn on too soon, which can cause cool air to blow out of your vents. Well this happens sometimes and a few things can be the cause. Check the Pilot Light. Related: Heat Pump vs. Air Conditioner and Gas Furnace, Which is Better? This guide will tell you what you need to know if that happens. Change the air filter. Your furnace’s fan is controlled by a limit switch which tells it when to turn on and off. Furnaces can overheat from having dirty air filters. Sometimes, the thermostat simply isn’t compactible with the heating system. Sometimes, a furnace blows cold air due to duct leaks. The dirty air filter will block airflow, causing the furnace to run longer to heat your home until it overheats. So Why Is My Furnace Blowing Cold Air Instead Of Heat? To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. If you have an oil furnace blowing cold air then try this quick video on how to change your oil filter: 6. 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. The fuel system, the burners, the fan and the ductwork. Fortunately, they are pretty inexpensive and easy to change. 7. Some simple HVAC system issues easy to troubleshoot include: Gas furnace fan settings. Viewed 3k times 0. 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. Next, it actually restricts air flow that causes your furnace to work harder and if left too long…funny enough… it can actually cause your furnace to overheat. At first, I thought it must be because the weather outside is too cold and that's the reason why my heat furnace is unable to catch up with heating my whole house. Not realizing your high limit switch is dead (or even that such a part exists), you’ll be scratching your head on this one. Eventually this causes your furnace to kick in a safety feature called a limiter switch. Have an expert inspect your ducts along with the furnace. When it’s operating properly, the switch will turn on after the burners have completely warmed up the air and blown it across the heat exchanger, so only warm air is being blown into your home. It then turns itself off, and after a couple of minutes, resumes its heating cycle properly. 5740 General Washington Dr There is nothing more disheartening than to discover my own heat furnace blowing cold air in the middle of the winter months. Your system can sense this overheating and will turn off the burners but keep the blower (fan) on to help heat exchanger cool down. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. These become clogged sometimes, so you need to ensure that you are changing them regularly. Without combustion, you won’t have heat. Call an expert heating repair company if the problem persists. A home furnace, heat pump, or heater blowing cold air isn’t necessarily a reason to panic. Woke up one moring and it was blowing cold air. Leaky air ducts can also make your furnace work harder as it strives to meet your desired temperature that’s set on your thermostat. Ask Question Asked 6 years, 5 months ago. There are four main components of a furnace. Your furnace may be blowing cold air … 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. A dirty air filter hinder air movement through the furnace. There are, incidentally, some common causes for why your furnace may be blowing cold air instead of warm, and what you can do to fix the problem. Viewed 3k times 0. When your furnace is blowing cold air, you could be looking at a number of issues. If it’s … If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. Furnace Blowing Cold Air Sometimes – What to Do. Most often this air will feel cold when the fan is “on” but if you don’t notice a change in your overall home’s temperature most likely this is just blowing out room temperature air. Restricted airflow can overheat your furnace, causing a safety control to shut off the burners. If your air filter is dirty, replace it ASAP. With electronic ignition systems, cold air could be caused by an electrical issue or if parts need to be adjusted or replaced. 11 – No Fuel for Furnace . Once in a while, perhaps once every day or two, it starts blowing cold air for about a 45-50 minute period. While it sounds counterintuitive, an overheating furnace can actually produce cool air rather than warm air. Maybe, you were not using the unit during the summer. Should My Thermostat Be Set To “on” or “auto”? A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. This can cause your furnace to lock down for safety. How Often Should I Change My Furnace Filter? Troubleshooting a Furnace That's Blowing Cool Air. First your filters ability to keep your air clean is reduced causing more contaminants to flow through your air. Check the furnace’s air filter. This is what leads to the emission of cold air. If you’re not comfortable with that or run into problems, call a Phoenix furnace repair company. Damaged heating elements of electric furnaces also cause your furnace to blow cold air. Here are 7 possible causes, and only some cost money to fix Ph: 425.402.4456 To help cool the heat exchanger down, the blower motor will continue to run, which will eventually cause the furnace to blow cold air for a short amount of time. I have a York Diamond 90 furnace up in my crawl space. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. After you check your thermostat, it’s time to check your air filter. 88 views. If you have leaks or holes in your air ducts, warm air can easily escape which could explain why you’re feeling cool air coming from your furnace instead of heat. My furnace is … Compromised flame sensor. Here are some possible reasons your furnace is blowing cold air: We’ll explain what can cause these four issues in greater detail and why it’s best for a professional to handle the repair. There could be a few reasons why your furnace is chilling the room. The switch might also be hard to find, another reason you may need the help of an HVAC technician. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. Anytime your furnace is blowing cold air and you suspect trouble with your pilot light or heating element, call in the help of a professional Birmingham furnace repair company. If you’re comfortable doing so, just follow the manufacturer’s instructions for how to re-light it safely. Inadequate gas supply. Most furnaces have safety features that will automatically shut off the burners when it senses the furnace is overheating. | 2020. Your thermostat might have the wrong setting or maybe someone may have put the fan setting on which means no heat. Furnace Blowing Cold Air Sometimes – What to Do. So your fan will only run when your furnace system is running. Therefore, a furnace is built to blow air, but only warm air. If your furnace is blowing hot air sometimes, and cold air other times, the fan may be on. However, the fan will keep running, cooling the furnace to protect it from potential damage. One day when I came back home and I realised that my whole house felt kinda cold. This amongst most features in a furnace have sensors that will turn off certain features. Check to make sure your gas supply is turned in the on position (parallel/in line with the gas supply pipe. So your fan will only run when your furnace system is running. If the thermostat isn’t responsive, call a professional. It creates a spark, which lights the burners which saves the pilot light from being on at all times. 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. How to tell if there’s really a problem. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. If you only feel your furnace blowing cold air briefly, and the air is quickly replaced by … If you’re noticing that your furnace starts blowing cold air here and there, not consistently, it may be because your thermostat is set to ON. The pilot light is a small gas-flame inside the furnace that ignites the fuel. In such cases, a safety control device known as the limit switch will shut off the burners. Following up on the previous example, an issue that could cause your pilot light to go out is an not having the proper gas supply. The fan setting on your thermostat has two options, “on” and “auto”. But meanwhile, from your end, all you see is the furnace blower running nonstop, blowing cold air and you have no idea why it’s happening. Why is my new high efficiency furnace blowing cold air sometimes? If you know how, carefully try re-lighting the pilot. We're sorry, but it looks like we don't offer service to this zip code. Why Is My Furnace Blowing Cold Air Sometimes? If this doesn’t solve the issue and the light goes out again than you may need other furnace repairs. Active 2 years, 7 months ago. Sometimes the light just blows out, but it could also be a sign of another problem. Warming Up. There’s only one thing worse than a furnace not working, it’s a furnace blowing cold air. It restricts the airflow in and out of your furnace, which can cause this issue. If your furnace overheats, it could end up blowing cold air. A clogged filter means that airflow will be blocked over the heat exchanger. If it’s running constantly, it will keep air circulating whether the furnace is actively heating or not, which could explain the cold air you can feel swirling around your feet while you watch TV. The longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. (2020). On most high efficiency furnaces there are vent pipes that lead to the outside of your home from the furnace. If it’s not, they can replace it. Typically it is best to have an expert come take a look however, below are some common issues that can result in your furnace blowing out cold air. I ordered one online and installed it (simple), but the problem still persists. +2 votes. 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. One day when I came back home and I realised that my whole house felt kinda cold. Your furnace might be blowing cold air because there is no enough gas. If your furnace starts to run properly after the filter is changed, you’ve solved the problem. Many new furnaces are much more efficient and have different methods of lighting your furnace. If your Oil Furnace is Still Blowing Cold Air, Check Your Flame Sensor. Your gas supply could be turned off. Hans Heating & Air offers service 24/7/365 – we help you regardless of the time of day. Your System Was Just Turned On. Why Is My Furnace Blowing Cold Air Sometimes? The fan setting on your thermostat has two options, “on” and “auto”. A dirty air filter is a common culprit of furnaces blowing cold air. If your blower though comes on by sensing heat, it might take up to about 1 1/2 minutes to come on AFTER the burner fire comes on. These older furnaces typically have what is called a pilot light. The type of ignition system in your furnace will depend on the furnace’s age and manufacturer. Major duct problems. Funny as it may sound, a system set to “on” will not necessarily blow warm air. Pilot Light. An overheated furnace will cause cold air to emit from vents. When the thermostat is on, it might set the air to the room temperature. Should My Thermostat Be Set To “on” or “auto”? Alternatively, you can call your local utility company or an HVAC technician to make sure it is lit safely. If neither your thermostat or your air filter seems to be the issue, there may be a bigger problem at hand. What Is the Average Cost of Duct Cleaning? The clogs may block the filters, prevent the entrance of cold air into the furnace, and cause the overheating problem. In this situation, a limit switch will turn the burners off, but the blower fan will continue to run to cool the furnace down. Related: Heat Pump vs. Air Conditioner and Gas Furnace, Which is Better? Active 2 years, 7 months ago. Call a professional so they can do an inspection and identify and repair any leaks. Replacing the filter should solve this issue. Pilot Light Issues Furnace Blowing Cold Air : 11 Common Reasons Why And How to Fix It 1. If the valve is stuck closed, that may also answer the question, is your Toyota car heater blowing cold air. I took the liberty of opening the panel on the furnace and turning it off and back on again to see if that would help -- no luck. You should contact an HVAC expert that will help you find the solution. 6. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. I've done the same thing at the breaker, but the thermostat is usually closer at hand. 2. If you have a dirty filter, replacing the filter typically stops cold air from blowing. This can contribute to cooled air in vents and inevitably cause cool air to pass through your heating system. Before calling a repair service, assess these things. If you’re not comfortable with that or run into problems, call a Phoenix furnace repair company. 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. While it's blowing cold air, the thermostat calls for heat, but the furnace will not respond, even if I put the temperature way up. Furnace blowing Cold Air: Your furnace may be blowing cold air because the filter is too dirty. Your Furnace Fan will be running all the time even when the furnace system is off. Dust and debris in your indoor environment can usually accumulate around the filters. I did some googling and asking around, and folks told me my flame sensor was likely bad. Dirty Furnace Filter . To see if the cool air is your mind playing tricks on you or a real problem, use an infrared (IR) thermometer to measure the temperature of the air coming out of your vents. Break open the heater box and clean it … 7. It's also possible that the furnace's pilot light isn't well shielded. So you will feel air blowing through your vents but the air is not heated or cooled by your furnace system. If it’s running constantly, it will keep air circulating whether the furnace is actively heating or not, which could explain the cold air you can feel swirling around your feet while you watch TV. All Rights Reserved. If they’re not, try changing the batteries. When a heating cycle begins and your air handler turns on, that cool air will blow out of your registers before warm air does. If your furnace is blowing cold air, give us a call today! Privacy Policy. The cooler air is what ends up blowing into your living areas. When the furnace overheats, a safety device can turn the furnace burners off and the blowers will keep blowing cold air to cool the furnace down to a secure level. Unfortunately, this is not a problem you can fix on your own. New high efficiency furnaces have what is known as a condensate drain. Most professionals recommend changing a filter every 1-2 months. How to tell if there’s really a problem. Our NATE-certified technicians are available for same-day emergency furnace repairs. My brother's furnace started blowing cold air one on of the coldest days of the winter. Sometimes, the heat exchanger can get too hot and overheat. Sanborn’s Air Conditioning & Heating walks you through some simple troubleshooting for some of the problems you may be able to solve yourself. Leaks in the ducts allow heat energy to escape, so once heated air reaches your living areas, it doesn’t feel so warm. A furnace blowing cold air is indicative of a problem. Furnace Blowing Cold Air? 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. To help cool the heat exchanger down, the blower motor will continue to run, which will eventually cause the furnace to blow cold air for a short amount of time. Your furnace may be blowing cold air because the filter is too dirty. Sometimes the light just blows out, but it could also be a sign of another problem. A friend of ours bought a new house recently. Some reasons your furnace is blowing cold air: 1. A furnace blowing cold air is not going to happen for no reason, so keep working your way up from most obvious to least obvious. Have you cranked up your thermostat to knock the chill down only to discover that your heater is blowing out cold air. Don’t freeze on days and nights you should be warm and cozy. While it's blowing cold air, the thermostat calls for heat, but the furnace will not respond, even if I … Click here for a guide on how to fix this problem. Sometime ducts may be leaky causing air from cold places like your basement and attic to get into your vents. Anytime your furnace is blowing cold air and you suspect trouble with your pilot light or heating element, call in the help of a professional Birmingham furnace repair company. Especially if your furnace is blowing cold air. Let’s see what causes both the scenarios and how to fix it: Situation #1: When the heater blows warm air for a while and then blows cold air. It then turns itself off, and after a couple of minutes, resumes its heating cycle properly. Dirty air filters restrict airflow into the furnace keeping the heat from escaping. I have a York Diamond 90 furnace up in my crawl space. So what causes the furnace to overheat? Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. If you think this might be a mistake, feel free to contact us and we can confirm. 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. As filters become more clogged a few things happen. Filters of a Furnace Blowing Cold Air. If you are in need of a furnace repair you can trust our furnace experts here at JPS Furnace & Air Conditioning. Ensure that the air supply vents are opened well. The Thermostat Fan Is Turned Incorrectly. Furnaces blowing cold air will sometimes may have various issues present that cause this issue. However this can cause quite a few issues if your furnace filters are not changes on a regular basis. It’s job is to remove water that is created during the heating process. If your heater starts by throwing warm air out of your registers, but you are soon left with a heater blowing cold air, then I would suspect that your flame sensor needs to be cleaned. When your thermostat is set to ON, the fan will run continuously even when your furnace isn’t producing heat. Your furnace is supposed to heat up your home and instead, it’s making it even colder for you by blowing cold air. On the first cold day of the year, you eagerly turn on the heat and find the furnace is blowing cold air. He called me over to help repair his system. Sometimes a clogged filter can cause a furnace to overheat and even break down. 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. A furnace blowing cold air is not going to happen for no reason, so keep working your way up from most obvious to least obvious. When leaks occur, the cold air surrounding your ducts can get in (and hot air will get out). If your furnace keeps blowing cold air, you may notice that your air filter is too dirty. It’s important to have a professional do cleaning and maintenance on your furnace annually, to ensure that the problems you may come to face are minimal. My furnace seems to be blowing cold air. There can be many reasons for this. A furnace blowing cold air is indicative of a problem. Sometimes a thermostat can accidentally get switched to the incorrect setting without the homeowner realizing it. When air blows over the coils, the air picks up that heat. When your furnace isn’t running, the air in your ducts cools down. If this drain becomes clogged your furnace may prevent your burners from lighting. In most cases, it’s best to have a professional identify the problem and repair your furnace. If your gas furnace only blows cold air periodically, your HVAC system fan settings may be the problem. Why is my heat not coming on? The “on” option is exactly how it sounds. The blower keeps blowing to cool the furnace down to a safe level. Or the gas line isn’t supplying enough gas to your furnace. If you have the same thermostat for a while, check the batteries. Be sure not to overlook this issue as it can cause damage to your furnaces heat exchanger which can be a costly repair. Funny as it may sound, a system set to “on” will not necessarily blow warm air. The house stays at a constant 72 degrees (what it's set at), but I'm afraid that the unit may be in need of repair or replacement, or that it might be using more energy than necessary. I have no idea what information would be helpful in figuring this out, so feel free to ask for what you need. This causes your furnace to kick in and start heating up while the fan circulates the air. If you’re comfortable doing so, just follow the manufacturer’s instructions for how to re-light it safely. 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. Clogged filter causes safety control shut off. Before you troubleshoot the problem, it is important to understand how the furnace is blowing cold air. Solution: Change the air filter and see if your furnace starts only blowing warm air. Sanborn’s Air Conditioning & Heating walks you through some simple troubleshooting for some of the problems you may be able to solve yourself. An electric ignitor doesn’t require a pilot light and would act very similar to a gas stove top. Why is my furnace blowing cold air sometimes? 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. Check if your thermostat is set to ON instead of AUTO. 11 – No Fuel for Furnace A professional can check the limit switch to make sure it’s working correctly. Or the furnace always blows cold air. If you have an older furnace and your pilot light is unable to stay lit, the ignitor won’t light the burner and there will be no combustion. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. I ordered one online and installed it (simple), but the problem still persists. It is essentially a small flame that is running at all times and is required to light your furnace burners. There are many issues that can cause your heater to blow cold air. Your System Was Just Turned On. Fortunately, they are pretty inexpensive and easy to change. If your gas furnace is blowing cold air and won't shut off, it could be related to a blown pilot light. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. Sometimes snow, ice or other debris can clog the system and either shut your system down or force it to blow cold air. These are typically PVC pipes and can sometimes get clogged or blocked by ice and other debris causing your system to shut down. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Double-check that your thermostat is set to HEAT and not COOL. 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. This is a good thing. Woke up one moring and it was blowing cold air. Furnaces can overheat for a variety of reasons, including: If you’ve already checked your air filter and you know it’s not the source of the problem, you’ll need to contact a professional for a furnace inspection.. Furnaces can overheat for a variety of reasons, including: But first, we’ll share a couple of fixes you can try at home before you call a pro. After making sure your thermostat is set to HEAT, make sure the fan is set to AUTO and not ON. We have been servicing Calgary & surronding areas for over a decade With Top-Rated, award winning service. Alexandria, VA 22312 Map | (800) 948-6453, © Michael & Son Services Inc. 2003–2020. Dirty Furnace Filter. Sadly, this cannot be solved on its own. It is important to clean both the oil and air filters frequently. Most commonly, a dirty furnace air filter. This turns off the burners to prevent a fire in your home. Check the pilot light. Tags: Calgary, Chestermere, Airdrie, Cochrane, © 2018 JPS Furnace & Air Conditioning, SiteMap. The cause behind a gas furnace blowing cold air can be simple or more complex. What I'm dealing with: My controller is a White-Rodgers (model 50A50-298). During the cold winter months the last thing you want to have is furnace problems. That outside air in the mix lowers the temperature of the air that’s just come from your furnace. 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. Why Is My Gas Furnace Blowing Cold Air? Sometimes corrosion and plugged inner tubes may be the culprit, or debris has interrupted the heater core fins.

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