More cool air than warm. The furnace blowing cold air, or there is no heat in the house. The longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. 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. 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. Why Is My Furnace Blowing Cold Air? It then turns itself off, and after a couple of minutes, resumes its heating cycle properly. Have an expert inspect your ducts along with the furnace. Bryant furnace error code 33 https://youtu.be/fMHvgBxDwm03. If your filter gets dirty, it can block the airflow in the heat exchanger. Is the furnace’s blower constantly running? Heater blowing cold air; Furnace won’t turn on; First, Check Your Thermostat Setting. Your furnace may be blowing cold air because the filter is too dirty. After you check your thermostat, make sure it is set to AUTO – this allows the blower to run only while the furnace does. Dirty Furnace Filter. 7. 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. 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. Cold air trapped inside will need to be expelled before the hot air can take its place! Restricted airflow can overheat your furnace, causing a safety control to shut off the burners. 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. So too with an electric control panel. 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. If the leaks aren’t excessive, a professional may opt to repair single leaks. Have a professional inspect the fan limit switch. I ordered one online and installed it (simple), but the problem still persists. blowing cold air furnace broken It was a dark and stormy night. It restricts the airflow in and out of your furnace, which can cause this issue. 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. Or I The air coming out of the vents will just be about whatever the temp inside is currently, or colder. If you have the same thermostat for a while, check the batteries. Well this happens sometimes and a few things can be the cause. The longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. 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 to see if one of these troubleshooting tips fixes the issue. When you have a heating, air conditioning or indoor air quality issue in your home, rely on the professionals at Sanborn’s. 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. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. 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. Your fan limit switch is located just under your furnace hood and is in charge of telling your furnace blower when to come on. When you have a furnace blowing cold air sometimes, your Redlands area home definitely isn’t as comfortable as it could be! 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. Make sure the thermostat is set to “AUTO”, not “ON”. Need a tech ASAP? 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. Especially if your furnace is blowing cold air. We’ve tried to troubleshoot the issues your furnace might be having. If you just turned on the heat, hot air may not yet be flowing through your air ducts. Heating systems are generally easy to maintain. When the thermostat is set to ON, the furnace blower motor continuously runs, even when the furnace does not. This causes the system to overheat, and your furnace trips its limit switch because internal temperatures are too high. When this happens, a high limit switch will cause the furnace burners to shut off in order to avoid damage. 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. Dirty Filter. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. It’s Just Been Switched On – Any furnace will blow cold air when it starts up, since it takes time for hot air to travel through the system and into your home. If you only feel your furnace blowing cold air briefly, and the air is quickly replaced by warm air, this is the most likely explanation. Regular maintenance… A … 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. 1. Heat pump systems operate pretty differently than standard furnace systems. Your furnace may be blowing cold air because the filter is dirty. 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. 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. Overheating Furnace . Rinse, dry, and replace. 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. While it's blowing cold air, the thermostat calls for heat, but the furnace will not respond, even if I … I would advise you to call a technician out to check since electric heat is very dangerous to work with. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. Thermostat: A Furnace Blowing Cold Air Could be Due to Your Thermostat. 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. There is a reason for this – it works! The most common source is holes or leaks in the duct work which allow warm air to escape and cold air to enter. This would not cause you to get cold are but it will run up up your electric bill. 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. 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. Dirty Furnace Filter. How to test Pressure Switch! Once the heat exchanger cools down, your furnace will try again to warm your house (and will likely repeatedly turn on and off). Sanborn’s Air Conditioning & Heating walks you through some simple troubleshooting for some of the problems you may be able to solve yourself. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. A home furnace, heat pump, or heater blowing cold air isn’t necessarily a reason to panic. Verify the unit has power. So, how do you know which problem is causing your furnace to blow cool air? Make sure your thermostat is set to HEAT and your fan is set to AUTO. Is your furnace blowing cold air? This “hot then cold air” sequence happens over and over and your home isn’t warming up. If your thermostat is set to "on" instead of "auto," it could be causing your furnace to blow cold air. We’ve tried to troubleshoot the issues your furnace might be having. And when the blower slows down, it can’t push as much cool air over the heat exchanger, eventually causing it to overheat. Check the air filter. When the air filter is dirty, airflow through the system is restricted and the furnace may not be heating the air. Well, if your furnace is blowing cold air, it’s most likely due to one of these problems: Yeah, that’s a lot of possibilities. 1) Thermostat is set to ON Is your furnace blowing cold air only sometimes? Water on the floor around your furnace is a clear sign of this issue. Your supply vents (pictured below) push warm air into your home. But, if the switch is bad, they’ll need to replace it. 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. The fuel system, the burners, the fan and the ductwork. A dirty air filter is a common culprit of furnaces blowing cold air. Go to your thermostat. 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 … furnace, it produces condensation. I have an electric furnace that blow cold air sometimes. So, how do you know which problem is causing your furnace to blow cool air? Electric Furnace Troubleshooting. 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. I did some googling and asking around, and folks told me my flame sensor was likely bad. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. So I live in a mobile home with an electric furnace, and occasionally it will just completely stop producing heat. All Rights Reserved. So here’s the situation: It’s a chilly night in Phoenix and you turn the heat on, expecting some warm relief. Troubleshooting a Furnace That's Blowing Cool Air. 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. To troubleshoot an electric furnace, start with the obvious and move to the complex components. However, if a blockage is present, condensation will back up and trigger the overflow kill switch which shuts down the furnace to prevent damage. It then turns itself off, and after a couple of minutes, resumes its heating cycle properly. 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. Good Luck. There are many issues that can cause your heater to blow cold air. (That’s where a tech will start first, so you should as well.) Sanborn’s Air Conditioning & Heating walks you through some simple troubleshooting for some of the problems you may be able to solve yourself. Or I 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. So I live in a mobile home with an electric furnace, and occasionally it will just completely stop producing heat. © 2020 Patrick Riley, LLC. Here are 6 common reasons for a furnace blowing cold air, and what you should do about it: 1. I have a York Diamond 90 furnace up in my crawl space. If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. Our technicians take over when troubleshooting isn’t enough, performing reliable repairs to help your furnace run flawlessly throughout the winter season. Detach the pan and clean it with dish soap and warm water. Furnaces use an indoor fan to push hot air through your air ducts and into your home. So what’s the problem? 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. 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). Issues present that cause this issue furnace burners cut off, and after a couple of minutes resumes. Is electric furnace blowing cold air sometimes hot air can take its place take its place to notice that your electric or! 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