The furnace comes on and blows warm air and then for no apparent reason every now and then starts blowing cold air and we have to switch it off to get it to stop blowing the cold air. If you just turned on the heat, hot air may not yet be flowing through your air ducts. If you have a high efficiency furnace, it produces condensation. There are four main components of a furnace. So here’s the situation: It’s a chilly night in Phoenix and you turn the heat on, expecting some warm relief. Heating systems are generally easy to maintain. Normally, this switch should allow the furnace burners to warm up completely before turning the fan on and should keep the fan running just until the burners cool off slightly (to prevent damage or overheating). Customer : Both of the electric heat strips (heat elements) come on; it blows warm air for a short period and then cool air. However, if a blockage is present, condensation will back up and trigger the overflow kill switch which shuts down the furnace to prevent damage. Typically, the condensation drains away from the home through the condensate drain line. Your System Was Just Turned On. Check the air filter. This extra pressure puts strain on the furnace blower, slowing it down. Your System Was Just Turned On. If you have the same thermostat for a while, check the batteries. Ensure that your thermostat is set higher than the temperature in your home. If you’re comfortable doing so, just follow the manufacturer’s instructions for how to re-light it safely. Otherwise your electric heater or gas furnace will not turn on. The bad behavior is that about 50% of the time, I walk to the controlled rooms and the fan is blowing but the air is cold, and the temperature is far below the heater on set point, and the thermostat is visibly still calling for heat. If you have a furnace that continues to blow cold air sometimes, don’t suffer through the season with inconsistent comfort control! Have a professional inspect the fan limit switch. Allowing this issue to continue could cause great energy waste and the longer you ignore it, the more damage your heating system could incur. Sanborn’s Air Conditioning & Heating walks you through some simple troubleshooting for some of the problems you may be able to solve yourself. Try leaving the furnace off for a few minutes before switching it on again, and that may clear up the issue of your furnace fan blowing cold air. Rinse, dry, and replace. to repair your furnace fast! If the filter’s surface is caked with contaminants, it’s time to replace it. A dirty air filter blocks the airflow which in turn can cause the furnace to overheat. That cold air mixes with the warm air from your furnace, causing the air coming from your vents to feel considerably cooler than it should. To troubleshoot an electric furnace, start with the obvious and move to the complex components. Cold air trapped inside will need to be expelled before the hot air can take its place! All Rights Reserved. To clear condensate line clogs, do the following: Turn off power to the furnace at your home’s electrical panel. 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. Troubleshooting a Furnace That's Blowing Cool Air. We’ll send over a Phoenix professional to get your furnace back to normal operation. 2. Dirty Furnace Filter. Now let’s talk about an even more common reason a furnace might blow cold air: you’re using the wrong fan settings. why does sometimes my electric furnace only blow out cold air but if i flip the breaker off and what a few sec and flip it back on it fixes the problem and it starts blowing out warm air … The fan, however, may keep on rockin’, causing that cold air to blow. But that fan has two modes of operation: ON and AUTO. 1. Below are some reasons you may be getting a blast of chilly air and how you can warm up your house as soon 1as possible. And when this happens, your fan limit switch (the switch we discussed above) will shut off the burners and keep the fan on until the heat exchanger cools down. Compromised flame sensor. If your furnace is blowing cold air… However, if a blockage is present, condensation will back up and trigger the overflow kill switch which shuts down the furnace to prevent damage. This means that your electric heat strips are not coming on. Typically, the condensation drains away from the home through the condensate drain line. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. 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. I did some googling and asking around, and folks told me my flame sensor was likely bad. Two thermostat issues that could cause your furnace to blow cold air include: Yeah, we know the first one seems like a pretty silly problem but you’d be surprised by how many residents in Phoenix leave their thermostat set to COOL year round and just forget about their HEAT button altogether. This would not cause you to get cold are but it will run up up your electric bill. If you want help from us, you'll have to tell us the make and model of both the furnace and thermostat. The furnace comes on and blows warm air and then for no apparent reason every now and then starts blowing cold air and we have to switch it off to get it to stop blowing the cold air. In a furnace, the heat being produced and blowing into your home starts out at upwards of 110 or more degrees, often much higher than that. It has a clean air filter in it also. To clear condensate line clogs, do the following: If you have a furnace that continues to blow cold air sometimes, don’t suffer through the season with inconsistent comfort control! You should contact an HVAC expert that will help you find the solution. Restricted airflow can overheat your furnace, causing a safety control to shut off the burners. https://youtu.be/ssI_YCnnF4Q2. With temperatures falling below zero several times already this winter season, now is not the time for your furnace to be blowing cold air. The air coming out of the vents will just be about whatever the temp inside is currently, or colder. 6. Electric Furnace Troubleshooting. My electric furnace blows cold air, sometimes. Does the air start out cool and then warm up, or are the cool air cycles in addition to the warm air cycles (for example does it blow cold air 3 times a day, and warm air 7 times a … Water on the floor around your furnace is a clear sign of this issue. Meanwhile, you’ll get cold air because the fan continues to run as a safety measure, even after the furnace isn’t producing heat. When the furnace is off and no heat is produced, cold air will be blowing from the vents. So what’s the problem? Furnaces blowing cold air will sometimes may have various issues present that cause this issue. The longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. So, how do you know which problem is causing your furnace to blow cool air? The fan blows fine. This “hot then cold air” sequence happens over and over and your home isn’t warming up. Dirty Filter. If you only feel your furnace blowing cold air briefly, and the air is quickly replaced by warm air, this is the most likely explanation. Have a technician inspect your air ducts for leaks, Have a professional inspect the fan limit switch, Your thermostat settings need to be adjusted, Your fan limit switch settings need to be adjusted, Your thermostat fan button is positioned under ON or set to COOL, Your thermostat is still set to COOL not HEAT, Your thermostat fan setting is set to ON not AUTO, Your heating and cooling systems struggle to reach your desired temperature, You have higher-than-normal utility bills, Certain rooms or areas are stuffy or don’t cool/heat properly, You see ductwork with kinks, holes or loose connections, The air coming from your vents is first chilly, eventually turns warm but then gets chilly again before the fan cuts off completely between heating cycles. Regular maintenance… A … ©Sanborn's AC All Rights Reserved Valve+Meter Performance Marketing, Proudly Serving San Bernardino County and Riverside County, California, Furnace Blowing Cold Air Sometimes – What to Do. There are many issues that can cause your heater to blow cold air. Often, this issue is caused by the fan settings of the thermostat. So I live in a mobile home with an electric furnace, and occasionally it will just completely stop producing heat. Details. If your furnace is blowing hot air sometimes, and cold air other times, the fan may be on. The furnace will stop working to protect the heat exchanger from exposure to high heat – if the blower motor continues to run, only cool air will come out of your vents because the furnace is no longer working to produce heat. If the leaks aren’t excessive, a professional may opt to repair single leaks. 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. Check to see if one of these troubleshooting tips fixes the issue. Change the air filter. Schedule service Troubleshooting tip #1: Check the thermostat If your furnace blows hot air sometimes and cool air at other times, … And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. Ductwork with a loose connection. Have you cranked up your thermostat to knock the chill down only to discover that your heater is blowing out cold air. Your fan limit switch is located just under your furnace hood and is in charge of telling your furnace blower when to come on. Here are 6 common reasons for a furnace blowing cold air, and what you should do about it: 1. Call Sanborn’s Air Conditioning & Heating to repair your furnace fast! My electric furnace blows cold air, sometimes. 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. COVID-19 Update: We care about your health and continue to serve our customers safely. 7. Source. They may be able to adjust the settings so that the fan won’t blow cold air into your home. Go to your thermostat. When your furnace is blowing cold air, you could be looking at a number of issues. Overheating Furnace . But if you close too many, it increases pressure inside the duct system. Thermostat: A Furnace Blowing Cold Air Could be Due to Your Thermostat. After we switch it back on it blows warm air again, I am just wondering if anyone has had this happen before, before we go spending a whole lot of money to have a professional come to the house. You may have a bad defrost board on the outdoor unit not allowing your unit to come out of defrost. Your furnace may be blowing cold air … It’s not uncommon to notice that your furnace is blowing cold air sometimes, but hot air other times. 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. Sometimes, the thermostat simply isn’t compactible with the heating system. 1. See our response to recent issues regarding COVID-19. Especially if your furnace is blowing cold air. It then turns itself off, and after a couple of minutes, resumes its heating cycle properly. If you’ve read some of my other articles, you’ll know that I am a huge fan of checking the simplest problems first. If your filter gets dirty, it can block the airflow in the heat exchanger. An old or dirty flame sensor will cause your furnace to blow cold air, too. During the cold winter months the last thing you want to have is furnace problems. Good Luck. When the thermostat is set to ON, the furnace blower motor continuously runs, even when the furnace does not. It will also depend on how much insulation you have around your ducts and how old your furnace … Attach the wet/dry vacuum to this opening and turn it on to pull out any clog material. Our technicians take over when troubleshooting isn’t enough, performing reliable repairs to help your furnace run flawlessly throughout the winter season. Furnace blows cold air: This article describes what to check if the warm air heating blower fan delivers intermittent cold air into the occupied space, or if the furnace cycles between blowing warm air & cool or even cold air into the building.. Dirty Filter. furnace blowing cold air too I currently have the same problem with my gas furnace heating system; on occassion it blows warm air, but at least in the last few days, when it comes on, it is cold. If you find that your air … Is your furnace blowing cold air? The longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. Or I Check that all supply vents are open. blowing cold air furnace broken It was a dark and stormy night. If your furnace fan is set to ON, the fan runs continuously, whether or not your furnace is producing heat. If your Oil Furnace is Still Blowing Cold Air, Check Your Flame Sensor. Pilot lights used to be a standard component on any gas furnace before the 1990s. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. It then turns itself off, and after a couple of minutes, resumes its heating cycle properly. Find the exit point of the condensate line by following the tube to the outside of your home. The air coming out of the vents will just be about whatever the temp inside is currently, or colder. What to do if your heat pump is blowing cold air. A home furnace, heat pump, or heater blowing cold air isn’t necessarily a reason to panic. Once finished, turn power back on to the system. When you have a heating, air conditioning or indoor air quality issue in your home, rely on the professionals at Sanborn’s. An electric heater and a gas furnace blowing cold air will be exactly the same, so give it a few minutes after you turn it on. During the cold winter months the last thing you want to have is furnace problems. It restricts the airflow in and out of your furnace, which can cause this issue. We’ll explain each of the problems above, how you’ll know if that’s your particular issue and what you can do to fix it. Dirty Furnace Filter. When your pilot light is out, an otherwise perfectly functioning furnace will not provide heat for your home. A dirty air filter restricts airflow into your furnace. A dirty air filter is a common culprit of furnaces blowing cold air. 2. This usually results in a confused homeowner who thinks the cold air from their vents means there’s a problem with their furnace when really their HVAC systems are responding properly. A filter in any heating or cooling product is important, but it is something else that can break and cause issues. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. (That’s where a tech will start first, so you should as well.) If leaks are excessive, you may want to consider sealing your ducts. Well this happens sometimes and a few things can be the cause. Learn how to troubleshoot your furnace when it blows cold air and what could cause this issue, as well as how to get warm air blowing back through your vents. Is the furnace’s blower constantly running? This causes the system to overheat, and your furnace trips its limit switch because internal temperatures are too high. If your furnace is blowing hot air sometimes, and cold air other times, the fan may be on. It can be frustrating to deal with a malfunctioning furnace, but there’s still hope. Detach the pan and clean it with dish soap and warm water. If the furnace does not start back up after it has cooled and the air filter has been replaced, you may need to. Sadly, this cannot be solved on its own. The first thing you should check is the fuses or circuit breaker. Once in a while, perhaps once every day or two, it starts blowing cold air for about a 45-50 minute period. We’ve tried to troubleshoot the issues your furnace might be having. Funny as it may sound, a system set to “on” will not necessarily blow warm air. An electric heater and a gas furnace blowing cold air will be exactly the same, heater to kick on frequently throughout the day, increasing your energy costs. An electric heater and a gas furnace blowing cold air will be exactly the same, heater to kick on frequently throughout the day, increasing your energy costs. Why Is My Furnace Blowing Cold Air Sometimes? Furnace Blowing Cold Air Sometimes – What to Do. When the furnace stops, the blower motor will stop, too, so you don’t have cold air coming from your vents. If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. This can be a little bit confusing, so let’s clarify it carefully. Or I So too with an electric control panel. 1.Your Heater hasn’t had time to warm up. But, if the switch is bad, they’ll need to replace it. Click here for a guide on how to fix this problem. Possible Conclusion 1: It’s Not Blowing Cold Air. Your furnace may be blowing cold air because the filter is too dirty. Especially if your furnace is blowing cold air. Water on the floor around your furnace is a clear sign of this issue. While it's blowing cold air, the thermostat calls for heat, but the furnace will not respond, even if I … Instead, you’re blasted with cold air. blowing cold air furnace broken It was a dark and stormy night. If you’re still not getting warm air from your furnace, we can help. I have an electric furnace that blow cold air sometimes. When the furnace is on, the blower motor circulates hot air to heat your home. It has a LUX TX9000TS thermostat controlling it. So, how do you know which problem is causing your furnace to blow cool air? Is your furnace blowing cold air? Call Sanborn’s Air Conditioning & Heating. Your furnace may be blowing cold air because the filter is dirty. Sanborn’s Air Conditioning & Heating walks you through some simple troubleshooting for some of the problems you may be able to solve yourself. 2. I would advise you to call a technician out to check since electric heat is very dangerous to work with. Heat pump systems operate pretty differently than standard furnace systems. why does sometimes my electric furnace only blow out cold air but if i flip the breaker off and what a few sec and flip it back on it fixes the problem and it starts blowing out warm air … Why Is My Furnace Blowing Cold Air Sometimes? It has a clean air filter in it also. If you own an electric furnace and it's blowing cold air there's a few things that could be causing the problem. If your furnace continues to overheat and blow cold air after you replace the filter and open all supply vents, have a professional inspect the system for other issues. If it’s dirty, change it! Bryant furnace error code 33 https://youtu.be/fMHvgBxDwm03. 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. However, no matter what type of furnace you have, there are a few things you can … Once the heat exchanger cools down, your furnace will try again to warm your house (and will likely repeatedly turn on and off). Heater blowing cold air; Furnace won’t turn on; First, Check Your Thermostat Setting. So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. 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. I have an circa 1991 A/C/heater forced air unit. When you have a heating, air conditioning or indoor air quality issue in your home, rely on the professionals at Sanborn’s. If your thermostat is set to "on" instead of "auto," it could be causing your furnace to blow cold air. Here are 7 possible causes, and only some cost money to fix Ph: 425.402.4456 The fuel system, the burners, the fan and the ductwork. When the air filter is dirty, airflow through the system is restricted and the furnace may not be heating the air. If you’re comfortable doing so, just follow the manufacturer’s instructions for how to re-light it safely. 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. Furnaces blowing cold air will sometimes may have various issues present that cause this issue. Furnace sometimes blowing cold air. The cold weather has rolled in and you’re looking to warm up the house, so you decided to turn your furnace on only to find that it’s blowing cold air. furnace, it produces condensation. An electric heater and a gas furnace blowing cold air will be exactly the same, so give it a few minutes after you turn it on. Check your air filter. I have a York Diamond 90 furnace up in my crawl space. 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. The most common source is holes or leaks in the duct work which allow warm air to escape and cold air to enter. If I shut if off for a few minutes and then try again, about half the time it will blow hot air. Verify the unit has power. You see, a clogged filter restricts the amount of cool air that runs through your furnace’s system and causes the unit to quickly overheat and shut off. How to test Pressure Switch! Sometimes snow, ice or other debris can clog the system and either shut your system down or force it to blow cold air. 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. Need a tech ASAP? There are a few reasons your heat pump could be blowing cold air. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. Your supply vents (pictured below) push warm air into your home. Woke up one moring and it was blowing cold air. 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. Furnace Blowing Cold Air Sometimes – What to Do. If you just turned on the heat, hot air may not yet be flowing through your air ducts. 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. If they are low, this might be the cause of your furnace blowing cold air. Why Is My Furnace Blowing Cold Air? Why Is My Furnace Blowing Cold Air? Just contact us and we’ll send over an experienced Phoenix tech that can get your furnace working properly in no time. Translation: When your fan limit switch is set correctly and is working properly, you should never feel chilly air coming from your vents. Remove the air filter from the filter compartment and inspect it. Sometimes there is nothing wrong with the heat creation part of the furnace and instead the issue of cold air blowing is caused instead by the heat delivery. Unfortunately, you’ll need a professional to fix this problem. Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. 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.
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