There are four main components of a furnace. For a Trane furnace, blowing cold air is a sign of an issue that will need to be corrected for proper function to return. Cold air from these spaces can also get into the ventilation if ducts are damaged. A heat exchanger is a group of metal coils that are heated. Troubleshooting a Furnace That's Blowing Cool Air. One of the most common causes of a furnace blowing cold air is not actually a repair at all. Classic furnaces work by generating heat—usually by burning natural gas or powering an electric heating element—and then using that heat to warm air that is blown through a heat exchanger. Heat pump systems operate pretty differently than standard furnace systems. Most electric heaters have dual settings, and if your heater blows both cold and warm air at different times, you should check your thermostat. Is The Thermostat Set To Auto or On? Question – Some times my gas furnace starts then stops. A forced air furnace, as the name implies, uses hot air to carry heat through the house. This safety mechanism protects your furnace from overheating and the damage that causes. As long as that’s happening, everything’s hunky-dory. #3 – The Furnace Has Overheated. The fan blows fine. There are a few reasons your heat pump could be blowing cold air. When i run my heater it blows hot for 10 minutes or so, then it blows cold air out of the defrost vents. A dirty air filter restricts airflow into your furnace. Sometimes, the heat exchanger can get too hot and overheat. Using propane and have a remote. I then switch thermostat back to "heat" and unit shuts off as if the set room temperature has been reached although it hasn't. York Diamond 90 furnace blows cold air..red light flashes furnace states look in service manual, The person owners manual for sa11694 electric furnace might have many name. Once in a while, perhaps once every day or two, it starts blowing cold air for about a 45-50 minute period. Restricted airflow can overheat your furnace, causing a safety control to shut off the burners. Here are just a few things that could mean: 1) Dead Batteries in Thermostat When air blows over the coils, the air picks up that heat. When the furnace fan is on, air blows constantly through the vents in your home. It’s time to re-explore an issue that we get called about a lot during this time of the year—a furnace that’s blowing cold air. You count on the furnace to keep your home cozy and warm when our Georgia coast nights turn chilly, so the last thing you want to experience is an unexpected icy blast from your heating registers. Maybe your heater is not blowing hot air even though the fan is running. There are many reasons why a furnace blows cold air. I have an electric furnace that blow cold air sometimes. Some furnaces have an electric starter instead of a pilot light. Super cold is in the 40s, 30s, Possibly the hi 20s. 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 your Oil Furnace is Still Blowing Cold Air, Check Your Flame Sensor. If the furnace still blows cold air, then you may need a professional to take a look. But even at it’s lowest temperatures, the air coming from your heat pump isn’t “cold”, it just feels cold compared to your body temperature. This can cause the air … When the furnace comes on, warm air will blow for a while and then cold air blows … Find the answer to this and other HVAC questions on JustAnswer. This also means that the hot air from your furnace is escaping through holes in the ducts. The temperature in your home should rise gradually until reaching your desired setting. Worked fine last season. How to diagnostics a furnace when is blowing cold air. Then when the thermostat is switched to "emer", heat blows. The cold air blowing in your home is not good and the problems can vary. Compromised flame sensor. Have a 2005 36' Keystone Challenger Fiver. The air coming out of your vents might seem rather cool or your home is not staying as warm as the temperature you set. Format : PDF. Your furnace is supposed to heat your home, so the last thing you’d expect is to feel cold air coming from your home’s air registers when your system is running. Why Does My Furnace Blow Cold Air? It does not happen – KU. But, it is still warmer than the indoor house temperature, so it is still putting heat into the house. Most of the time, this isn’t serious enough to affect the heater, but if the airflow is completely blocked, the furnace … Is my furnace not working?? A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. When an element malfunctions, you will need to call an HVAC professional. I turn thermostat onto the "heat" position and set temperature at a higher temp than room temperature. 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. But all you have to work with are the symptoms. Furnaces aren’t running 24 hours a day (unless you’re constantly increasing the temperature in your home). 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. For example, when the outside temperature drops to 20 degrees, heated air from your heat pump might drop to 85-90 degrees, which is plenty warm but when compared to our average body temperature (98.6), 85 degree air can feel cold. Other causes of furnaces blowing cold air So if the fan is on, the air that gets distributed throughout your living space may sometimes feel cool. Cooling, the blower runs 24/7 (and. So change the air filter if it’s dirty. In some cases, such as when a limit switch is bad, you won’t be able to confirm what is wrong without access to an amp probe and voltmeter. If I shut if off for a few minutes and then try again, about half the time it will blow hot air. Accumulated dirt or debris can block airflow and slow down the movement of hot air through the ducts. In many cases, the solution is much simpler than you may realize. Electric Furnace Blows Cold Air We have a Trane 2 1/2 ton Heat Pump (model 2TWR30301000A), a Trane 3-ton uncased coil (model 2TCXB036AC3HCAA) and a Coleman Electric Furnace (model EB15B). Rooms have a cold air intake vent, which allows cool air to be sucked down into the furnace. Furnaces too small cannot effectively heat your whole home. Once there, it is heated using natural gas, propane, oil, coal, wood, or electricity. Check the Pilot Light on Gas Furnaces. This video is unavailable. Some of the most common causes are surprisingly simple,… Continue Reading 5 Reasons Your Furnace Blows Cold Air Well, this is less than your body temperature, so it feels like cold air is blowing. ... sometimes the system just needs a restart. We are Floridians and it is going to be super cold the next few days or more. Your furnace actually heats air via a part of the furnace called the heat exchanger. Change the air filter. I?ve had people say to me, ?My furnace blows cold air only! Lack of power or a confusion in the mechanics is your problem here. If your furnace is improperly fitted for your home then that can be the cause of your cold air. If you cannot find a pilot light, then an electric heating element is probably what ignites your furnace. It has a clean air filter in it also. The heater’s blowing cold, or the AC is blowing hot. While it's blowing cold air, the thermostat calls for heat, but the furnace will not respond, even if I … When your furnace is blowing cold air, you could be looking at a number of issues. 5 Reasons Why Your Furnace Might Start Blowing Cold Air. This is of course a very unsettling problem and not one that you want to face. Check The Thermostat. Furnaces too big will cycle on and off. 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. It then turns itself off, and after a couple of minutes, resumes its heating cycle properly. Now it only blows cold air. Trane furnace blowing cold air explained . 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. This time of year, especially when it gets cold outside in the evenings, we get many calls from homeowners concerned that there is cold air blowing out of the duct registers in their home when their heat is running. Reason #3: Overheated furnace. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. And then your heat pump should shut off.