I live in FLorida and we are experiencing some very cold weather. When your heat pump sometimes blows cold air even when the setting for heat is on, it’s an alarming problem and depending on the cause, a common enough one. Reasons Why Your Furnace Might Be Blowing Cold Air The Thermostat is Set Incorrectly Symptoms. If your heating system is not providing warm air it could be because it has circulation problems. The pilot light has a continuous flow of gas, which keeps a small flame ignited to maintain the burners ablaze. 5. The hot air is eventually blown in the house through ducts and vents. Of course, any central residential HVAC system is supposed to provide cool air when it’s warm outside and heat when the outside temperature drops. home improvement and repair website. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. suggestions. Still getting cold air from your furnace? Copyright© Dirty air filters can actually reduce the airflow into the heater enough to freeze the coils and put the heater into defrost mode so you want to be sure they are changed out regularly. Restrictions can come from several places in a heater; one of the most common restrictions is from a dirty filter. The most common type is the furnace or heat pump, which is generally connected to a ducted air system. Once you have changed your filter, check that all the supply and return grilles are not blocked and completely open. Yesterday it started blowing cold air, and would not stop, even when turned off. The fix: Duct sealing. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat … Top 3 Reasons a Furnace Blows Cold Air #1 – Your Thermostat Is in the ON Position. A dirty air filter that is too clogged up will restrict the airflow in the heater, and it’s possible that if it’s restricted enough, it will cut off the burners that heat the home and cause it to pump out cold air. Many people have experienced the very uncomfortable and inconvenient phenomenon of a system blowing warm air instead of cold. Another type of restriction can occur in the filter dryer. Air ducts are leaking. Now open the access door of your furnace and slide out the old filter. Wiring or control board related. Customer : Both of the electric heat strips (heat elements) come on; it blows warm air for a short period and then cool air. For gas heating systems, check the flame of the furnace, which should be a clear blue. Yikes! Why is the heater blowing cold air from the vents - YouTube If a thermostat is set incorrectly, you might notice your furnace blowing cold air from the heat registers, a lower than expected temperature reading on the thermostat, or you may even hear your air conditioner running outside. Problem: Heater is blowing cold air Heat pumps have one drawback: They lose efficiency as the temperature drops. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. Or the gas line isn’t supplying enough gas to your furnace. Two Reasons Your Heat Pump Is 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 solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. When I am running my heating, the thermostat would reach temperature and th... Honeywell RTH3100C wiring. Blower motor not running, no power. Outside vents may need cleaning and removal of any leaves, dirt, and debris that may have been deposited. If your heat pump begins blowing cold air (not occasionally as described above), then you likely have a problem with the refrigeration portion of your heat pump. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. My central air unit is blowing out cold air under heating request. Gently replace it with a new filter. You will then use the compressed air can to blow away any debris you created when using the brush. Make sure the thermostat is set to “AUTO”, not “ON”. Website operating Ice forming on your refrigerant coils http://www.greenintegrateddesign.com/blog/why-are-my-air-conditioning-coils-freezing-over3. If the filters have not been regularly changed, that dust that should be caught by the filter may have gotten past the filter and ended up on the coils, further clogging the system. 2. To change the filters, make sure you have the correct filter size on hand; the size is generally marked on a sticker on the access door. … If it needs to be changed, put a clean on in before you do anything else. An electric heater that blows cold air could be caused by one or more of the following reasons: The manual reset has tripped. The first thing you have to do is check to see what type system you own. To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience. The most common type is the furnace or heat pump, which is generally connected to a ducted air system. That being said, sometimes furnace problems are the result of faulty ducts, a defective heater or both. Have an expert inspect your ducts along with the furnace. 3. I have a 20-year old LENNOX Furnace - 80UHG3/4-120A-2 There are a few reasons your heat pump could be blowing cold air. If your central heating system is blowing out cold air, you'll have to follow these steps to repair it. Possible Conclusion 1: It’s Not Blowing Cold Air Heat pumps are highly efficient to about 32°F.Below freezing, your heat pump simply can’t draw enough heat from the cold air outside and will kick on its auxiliary heat mode to generate heat for your home. 5kw heat strips. Use the small wire brush to clean the gas release hole area for the furnace pilot light. Heat leaks from these ducts, and the air at the end of a long duct may be colder than the air going into the system, even with the additional heat provided by the backup heat system. As soon as the furnace cycles back on the air … The first thing you have to do is check to see what type system you own. When the pilot light gets dirty it will not light properly and heat will not be provided through the burners. This is done when the cool air is blown across the heat exchanger in the furnace. If too many contaminants become caught in the filter medium, it can become clogged just like your air filters and restrict the flow of refrigerant to the compressor. What Are The Symptoms?1. Central heating systems are made of a single centralized furnace in your house, generally located in the garage or basement. When set to “ON” the fan will stay on even when your heat pump isn’t actually heating. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. There is a new motor ... 5 Tips for Cleaning Your Central Heating... 5 Tips for Cleaning Your Central Heating System. Clogged air filters could be causing cold air to blow out of your vents. To find out if your heat pump is actually blowing cold air, hold a thermometer up to the supply vent (the ones that blow out air) then hold it up to a return vent (the ones that suck air in). This issue needs the attention of an HVAC technician as it is unlikely you can solve the problem yourself without buying several different diagnostic tools and completely understand heat pumps and heat pump components . This provides heat to the entire building. This video will explain what causes cold air to come out of the vents when you have your heater on when warm air should be coming out.Where do restrictions come from? 1995-2018 MH Sub I, LLC dba Internet Brands. All information is provided "AS IS." Honeywell central heating not working blowing cold air constantly [ 0 Answers ] Hi, we have a honeywell central heating system. When the temperature is set, it will not heat the house, but continues to blow cold air … I have a forced hot air system that's about 10 years old. You need at least a foot of clearance for proper airflow around each vent.4. Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air. You can keep it fully functional for a long time through frequent maintenance, but small repairs may be needed from time to time. The filter dryer’s purpose is to catch contaminants from entering the compressor. Also known as forced air furnaces, central heating systems distribute heat throughout your home through a series of ducts. The air coming from your supply vent should be anywhere from 15-30 degrees hotter than the air near your return vent (depending on how cold it is outside). I turned on the heat and the air coming out of the vents are not ho … read more Questions of a Do It Yourself nature should be The fan, however, may keep on rockin’, causing that cold air to blow. (AC COLD is blowing Warm Air Instead of Cold Air... heat strips.. T stat or defrost board? All rights reserved. Central heating systems enable you to control the temperature of your home by means of the thermostat regulated to your liking. The home is not warming up to the thermostat set point during the winter season Consider changing your furnace filters at least once or twice a year, especially if you have pets in the house. Details I know the registers and grilles aren’t the prettiest things to look at, but don’t cover them with dressers or bookshelves if they are in the wall or in the floor. A regular cleaning of the indoor coil and sealing the ductwork can go a long way in having a problem-free heater and air conditioning system.Other Reasons Why Cold Air Is Blowing Out Of Your Vents Besides restrictions in all its forms, cold air may be blowing out of the vents due to other reasons as well.1. Your thermostat has an ON and AUTO switch that runs your blower. An old or dirty flame sensor will cause your furnace to blow cold air, too. Not having enough airflow over the coils can also cause a lack of heat transfer and drop the Freon temperature below freezing, which can start ice blocks to form over the refrigerant lines and coils. I would advise you to call a technician out to check since electric heat is very dangerous to work with. The fan switch is “on” and the thermostat setting is below the actual temperature; The fan is dispersing this air after shutdown; There may be a loose wire coming from the elements; The heater element may be defective 11. 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. How to test. to this site, and use it for non-commercial use subject to our terms of use. Heat pumps are never supposed to loose refrigerant, if your system is suddenly low on refrigerant, it likely has a leak that should be repaired. If your house is 60 degrees and the air coming out is 80 degrees it will still feel cool when it is in fact warm. Constantly having to re-light your pilot light is not normal and a health and safety hazard and your heating system and flue assembly should be inspected.3. There are two different system types: forced air duct systems that push warm air with the aid of a blower into the system and vents, and gravity furnace systems that use convection currents to circulate the warm air. If you have an older gas furnace, check that the pilot light hasn’t gone out. Just like in the summer, the system requires the proper level of refrigerant. If your heater is blowing warm air but that air is venting into the attic or mixing with colder air from your attic, then the net result will be that your heater is blowing cold air. If it’s a particularly cold day or night, your heat pump might just be blowing air that’s cooler than your body temperature, making you think it’s cold. When cold air flows instead of warm air, you could have obstructions in your vents, found both inside and outside your house. If your ducts are leaking (and ENERGY STAR says that almost all homes leak about 30% of the air in their ducts), cold outside air is making its way into your ductwork. 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. Your furnace can then trip a high limit switch which will, in turn, cause the furnace burners to shut off so that the heat exchangers don’t crack. Compromised flame sensor. problems contact webmaster@doityourself.com. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. However, if you are going to undertake the task yourself always remember to shut off the electricity or gas flowing into the furnace for your own safety. What to do if your heat pump is blowing cold air. If you suddenly notice the unpleasant surprise of your cold air coming out of your vents several things may be happening to your heater to cause this strange phenomenon all centered on a “RESTRICTION” theme. For vents found inside the house, look for any furniture that might be blocking the vents. It may seem over simplified but check your air filters and if it’s dirty. To clean the pilot light, make sure the thermostat and gas flow are shut off. First shut your heater and fan to the off position on your thermostat because if your vents are blowing hot air, continuing to run your heater will further the problem. Low refrigerant. Once you are done, use the hand-held vacuum to remove any dirt left. You may freely link We welcome your comments and Such a problem could be caused by a dirty filter. Loose wires or improper wiring can trick your heater to thinking it’s an air conditioner. T6 pro t stat honeywell.... central air with baseboard heating system. How to repair(fix) electric central heating system furnace, no heat blowing, not heating problem. Inadequate gas supply. When the sensor isn’t working properly because it’s covered in grime, your burner will keep shutting off. Even if there is an HVAC system that both heats and cools the home, they both will use the air filter, so if the A/C is running, then the air filter still needs to be changed, just the same as if the heat was running. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. More cool air than warm. DoItYourself.com®, founded in 1995, is the leading independent We recommend the 4” HEPA filters first, and then the cheap 30 day filters second and LASTLY the 1” pleated filter (booo)!2. Your heat pump might not actually be blowing “cold” air. Why tell this story? submitted to our "DoItYourself.com Community Forums". Dirty evaporator coils can also cause low airflow restrictions. Check the furnace’s air filter. Regular maintenance… A … [STOP AND DO THIS EASY FIX FIRST]1. If the switch is in the ON position, then the blower keeps running, even when the furnace is not heating. Your gas supply could be turned off. 7 Tips for Maintaining a Central Heating... 7 Tips for Maintaining a Central Heating System. Noise with blower on heat since A/C upgrade. Adding more refrigerant always guarantees you’ll have another call heater or air conditioning problem down the road. Another possible problem is the accumulation of dirt and debris inside of ductwork which can slow down airflow. If problems persist consider calling a repairman. But all you have to work with are the symptoms. Whether the systems function by gas or electricity, they still perform similar operations: burning fuel or taking in electricity to convert into heat. Your furnace may be blowing cold air because the filter is too dirty. If these strips malfunction, the heat pump will blow cold air. They also use auxiliary heat strips if the outside temperature is extremely cold. The furnace generally has an exhaust system that gets rid of any fumes. First of all, cold and warm are very relative terms. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. This can cause the air to feel only lukewarm. 2 TON 2 STAGE TEMPSTAR heat pump. A Green ID technician will be able to diagnose exactly where the problem is coming from and make the appropriate repairs. This means that your electric heat strips are not coming on. The second type of restriction can come from blocked vents. (AC is blowing Warm Air Instead of Cold Air). Top Reasons Central Heat doesn’t Work. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. And when the blower slows down, it can’t push as much cool air over the heat exchanger, eventually causing it to overheat. Blower speed is set too low. There are two different system types: forced air duct systems that push warm air with the aid of a blower into the system and vents, and gravity furnace systems that use convection currents to circulate the warm air. You should also clean the cold-air returns. View our Privacy Policy here. You see, a heat pump heats your home by moving heat from the outdoor air into your home. Obviously having cold air blowing out of your vents 2. Due to their design, heat pumps blow colder air than gas and electric furnaces. The heater’s blowing cold, or the AC is blowing hot. Heat Pumps. If it’s dirty, change it! Honeywell RTH3100C wiring. These are a few of the simplest methods for troubleshooting your central heating system. Am running my heating, ventilation, air conditioning ) system might stop working,! Furnace filters at least once or twice a year, especially if you have work. Keep shutting off blocks airflow over the furnace generally has an exhaust system that gets rid any... 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Remove any dirt left may freely link to this site, and debris inside of ductwork which cause! Before you do anything else advise you to call a technician out to check since electric heat..! Do is check to see what type system you own air to blow cold blowing! The appropriate repairs filter dryer may be blowing cold air, and would not stop, when. S purpose is to catch contaminants from entering the compressor questions of a do it Yourself nature be..., found both inside and outside your house phenomenon of a do it Yourself nature should be to! Dirty filter just like in the summer, the system requires the proper level refrigerant! Auto ”, not “ on ” the fan will stay on even when your heat pump, is! Inconvenient phenomenon of a system blowing warm air instead of cold: Turn off heat! Doityourself.Com®, founded in 1995, is the furnace or heat pump which. Might not actually be blowing cold air under heating request and removal of any leaves, dirt and... 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