heat is on but blowing cold air

fan speed, and vent option. There are a lot of options when it comes to thermostats, but they all control both heating and cooling. More often than not, electric heaters blow cold air when its filters are clogged, and that's why it's the first thing you should check. Start by checking that your thermostat is set properly. When a heating cycle begins and your air handler turns on, that cool air will blow out of your registers before warm air does. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. 3) Pilot light is out If your gas furnace is only blowing cold air, then the pilot light may be out. level 2. Tell us about your home and preferences, and get a customized recommendation, Carrier contractors are ready to help you create your ideal home environment. Similar to when you turn on the faucet before you get into the shower, you may need to wait for a bit for that air to heat up. Make sure the thermostat is set to “AUTO”, not “ON”. Next, locate the pilot light assembly on your furnace and see if there is a flame. If it is, simply re-set the thermostat for heating, or change the setting to auto so it will automatically change between heating and cooling as temperatures change. It could even be running in the air conditioning mode due to a malfunction. You want to curl up in a cozy house after you deal with harsh weather conditions, so it’s time to take a look at the reasons the furnace may be blowing cold. If you continue to have problems associated with duct leakage or your furnace blowing cold air, an HVAC professional can provide a more sophisticated analysis and duct sealing options for ducts that are not easily accessible. And you wait — and wait — but the heater just blows cold air. Some of the most common issues include: Richard Epstein is a licensed master plumber with over 40 years experience in residential and commercial plumbing. Try kicking it up a notch to see if there’s a noticeable difference. The problem comes and goes now. This is the reason that it takes a while for heaters to start blowing warm air. Category: HVAC. Just not sure where all the water goes so fast with no leak. Maybe the fan is malfunctioning. Your furnace may be blowing cold air because the filter is too dirty. Families with young children know that heat registers can often get closed mysteriously after a play session. If your car is blowing cold air that means that, the hot coolant is not reaching the heater core. Also if your water heater has issues, you can check out this Water Heater Troubleshooting Guide to efficiently solve the issue. When the furnace starts heating, the fan limit switch waits until the air reaches a predetermined temperature before turning on the fan to blow warm air into the home. If you still suspect the problem is a dirty air filter, consult your owner’s manual for instructions on removing and cleaning or replacing your air filter. Any idea? We lost power for 4 days and just got it back. Pros recommend keeping at least 80 percent of your heating registers open to prevent unnecessary pressure in your furnace and ducts. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? If your furnace seems to be blowing cold air, it could be a problem with the ignition system. In other words, it's not putting out any heat at all. Well this happens sometimes and a few things can be the cause. 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). Air in the cooling system impedes the circulation of coolant in the system, and as a result, the heater blows hot air only when driving, and cold air at idle. Check the furnace’s air filter. If you suspect a dirty air filter, change the filter, press the reset button (if your furnace has one), and see if your furnace begins to emit heated air. Show More. Before checking your furnace filter, be sure the thermostat is set for heating and that the temperature setting is correct. Incorrect thermostat settings... a wave of cool air from your heat vent before the warm air arrives... and cool air circulating through the house because the constant fan setting is set to run when the furnace isn’t actively heating... these are all common reasons for a heating system blowing cold air. 7 common reasons a heat pump blows cold air BEFORE READING FURTHER: Watch this video on how a heat pump works. There are other reasons your heat pump could be blowing cold air instead of heat, but those are the basics. Heat was working on both side now only working on passenger side. If your furnace has a reset button (it’s often a red button located on the front, side or back of your furnace), try pressing it. Two Reasons Your Heat Pump Is Blowing Cold Air. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. If you have an older furnace with a standing pilot light, it’s possible that the pilot light is extinguished. If you can see the burner in your furnace, you may be able to visually inspect the flame sensor for cracks in its porcelain base, or soot build up on its tip. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. A new furnace can offer higher energy efficiency, new product reliability and warranties, and no issues with pilot lights blowing out. The average homeowner can often make simple repairs by straightening sheet metal and securing sheet metal joints with screws, or by using an appropriately rated tape product or sealant. 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. If so, your system may be circulating cooler air between heating cycles. Is there a way to then keep the compressor engaged, since temp will fall even with stage two running. If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional. Another common problem is when air gets into the cooling system. Major duct problems Ask Your Own HVAC Question. Inadequate gas supply. To make sure that your heat pump is actually blowing cold air, you’ll want to invest in an infrared (IR) thermometer. If you think that your heat pump is blowing out cold air, first you want to make sure that it actually is in fact blowing out cold air. Pros recommend changing them once a month. Once the pilot is lit, turn the gas valve back to the ON position. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. 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). The upper radiator hose is hot and the lower radiator hose is cold. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. 2010 Laramie recently had heater core and evap replaced after having the same issues described in this thread with heat on passenger side and blowing cold air on drivers side. I came home from work and the house was 80 degrees. Also, check the electrical switch at the furnace to make sure it is in the ON position. If your thermostat is properly set, ensure that it is getting power—check batteries, fuses and circuit breakers—and ensure that the interior components of the thermostat are clean. The pilot light might simply just need to be re-lit, or the gas valve could have been shut off after last season’s use. Possible Conclusion 1: It’s Not Blowing Cold Air The hot coolant flows in one side of the heater core and out the other side headed back toward the engine. Heat Pumps and Electric Home Heating - Heat pump not blowing cold air - Thermostat was set to 76. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. Check the owner’s information for your furnace to see if there should be a blower delay after the burner kicks on. There’s also nothing like the disappointment of discovering your furnace blowing cold air inside when it’s turning cold outside. I have 2006 dodge nitro the passenger side vents all blow hot air but the driver side vents blow cold air. This will lead to heat blowing out cold air. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. There are a lot of options when it comes to thermostats, but they all control both heating and cooling. If maintenance or repair work has recently been done on the furnace, this switch may have accidentally been left in the OFF position. This is a common problem with homes in the United States. A lot of air came out and slightly warmed but went cold again!! Or the gas line isn’t supplying enough gas to your furnace. We wanted to address this, as many times homeowners think this is an issue with their heating and cooling system, but if they have a heat pump, it's actually Oct 10, 2009 - When a car heater blows cold air, there are several possibilities that should ..... On my Dodge Neon when I turn on the heat it blows out cold air. Reasons Why Your Furnace Might Be Blowing Cold Air The Thermostat is Set Incorrectly Symptoms. Below is a list of possible causes. If this is the case, you may also see an error message on your thermostat, or a flashing LED light on the furnace control board. Items in red usually require a service call. My heat does not work it blows cold air and the heater and air only work on high. There could even be a puddle of liquid under the front of the vehicle. 1.Your Heater hasn’t had time to warm up. Programmable models take it a step further, allowing you to schedule temperature changes throughout the day, up or down, based on times you are typically home, at work, or in bed asleep. Fortunately, this is usually an easy fix. 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. It can be very uncomfortable and inconvenient if your car's heater system malfunctions as temperatures drop, and instead blows out cold air. Look to these possible causes one at a time. I have checked for leaks but can't find any. There are a few reasons your heat pump could be blowing cold air. Compromised flame sensor. When your heat pump blowing cold air, take advantage of these useful tips, and save yourself a little trouble. Or, it may prevent the furnace from operating at all. Basic filters are often inside the furnace cabinet, but larger, 4-inch media filters, electronic air cleaners, and whole-home air purifiers are likely mounted outside the furnace between the cabinet and the return air duct. Get daily tips and tricks for making your best home. A dirty sensor can be simply cleaned by your local Carrier dealer for an inexpensive repair. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. 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. Learn how to choose and maintain your HVAC system. This may happen if you forget to make a payment. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. If your heater is blowing cold air, and it’s not one of the first two possible explanations on this list, then you’ll need a specialist to at least come and take a look. This can cause your furnace to lock down for safety. Perhaps your temperature gauge is running below normal. Introducing "One Thing": A New Video Series. However the heat registers were closed, if too many are shut, it can cause heat to build up in your furnace, causing it to shut down automatically. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. It’s also the reason that a plugged heater core, stuck thermostat, or air in the cooling system can all cause a car’s heater to blow cold. Most cooling systems have a bend door that controls the flow of the air through the heater core. Show Less. Blocking heating vents causes your furnace to work harder and longer than intended and can shorten its life. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. Whether you are in the midst of a 110° heat wave or the arctic chill to end all arctic chills, you expect your HVAC vents to blast you with the desired dose of cold or hot air. Either of these would be a clue that a malfunctioning flame sensor could be causing your furnace to shut down. The coolant supply is blocked. Since the heater core is often the high point in a cooling system, air can move into it and become trapped. And, if your furnace does have a pilot light ignition, it may be time to consider upgrading to a new, pilotless gas furnace. I am just wondering if I hooked something wrong hooking up the thermostat , or perhaps I have a problem with the heat pump and need to call someone out to fix the problem. Have an expert inspect your ducts along with the furnace. Or the gas line isn’t supplying enough gas to your furnace. If it does, and you still want to close a few vents, try closing fewer vents this time. This isn’t a problem when it’s 55 degrees outside—your system will expel air that’s a toasty warm 110 degrees or so. If the heater has a tap for supplying coolant to the radiator, then this is closed or jammed because of rust. Tried to bleed air from coolant/ heater core lines, but … If you’re unable to warm your home with your furnace, and you’re looking for Heating And Air Companies in Atlanta, Moncrief Heating & Air Conditioning can help. The heater blows cold air. Alternatively, they may have experienced a computer or clerical error that made them think you haven’t paid yet. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. 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. Any ideas please. If the filters are caked with dust, then it's likely the culprit behind your heater's malfunction. You may have noticed a loud sound right before cold air blows out through the vents in your home. Solution: Change the air filter and see if your furnace starts only blowing warm air. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat … This button controls an automatic shut-off feature that shuts down the furnace if it gets too hot or if there are other problems. Electric Heater Blowing Cold Air: Problems and Solutions Troubleshooter 1 of 6: No Time To Warm Up. 23 years of experience. If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional. Your gas supply could be turned off. Many of these are particular to more sophisticated high-efficiency condensing furnaces that use electronic ignition, and most homeowners prefer to call a service technician to deal with them. 2. The flame sensor safeguards your furnace by ensuring that gas flows only when there is a flame to ignite it. Why a Heat Pump Will Blow Cold Air Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. Perhaps your temperature gauge is running below normal. It will happen even if the heater core is functioning. Many modern furnaces have a computer control board with coded LED lights that flash to provide you with information on problems with your furnace. Since the 1990s, the industry has shifted to using pilotless ignition systems such as hot surface igniters, so pilot-related issues are becoming less common. How to Maintain and Service Your Home Furnace, HVAC Education, Buying Tips, Furnaces, Heat Pumps, Technology, HVAC Education, Buying Tips, Furnaces, Technology. If the heater has a tap for supplying coolant to the radiator, then this is closed or jammed because of rust. Simply turn your system on, and hold your hand over joints, connections, or anywhere you can visibly see a seal in the ductwork. One of the most common causes of cold air blowing is that your utility company has cut off the heat. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 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. Rebecca, if I were close to where you live, I would come out and take a look at your system and tell you what was wrong and repair it for you. If it’s dirty, change it! It is very cold here in the mid-west, and my system (geothermal heat pump) cannot keep up without engaging aux heat. With all of the options available, there are a number of scenarios involving your thermostat that can result in your furnace blowing cold air. A lack of heat can be a symptom of a much larger problem. 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. Start by turning your heater off and inspecting the filters. There are many reasons your car's heater isn't working. Because a functioning flame sensor and a malfunctioning flame sensor can both result in a furnace shutting down, it may be best to contact an expert to determine why your system isn’t functioning properly. Make sure that your thermostat is set to HEAT, not COOL, and ensure that the fan is set to AUTO. Have an expert inspect your ducts along with the furnace. When it gets jammed, the heater will be blowing cold air. Only three options to control heating system temp. However, furnaces are “sized” to efficiently deliver comfort to the entire home. If the temperature in your home is cooler than the temperature you set on your thermostat, or if you hear your furnace start up and shut down quickly over and over, you might suspect a flame sensor has malfunctioned. My thermostat keeps showing auxiliary heat and it blows cold air. A few days later on the way back home, roughly 2 hours into the trip, the heater was blowing cold air. Inadequate gas supply. Warmth of the transformer that provides power to the furnace itself is power... Operating normally thermostat, or there is no heat for the heater blows cold air or replace needed. A play session that gas flows only when there is no heat in the position. There a way to the most complicated open to prevent unnecessary pressure in your furnace to improperly. And F-250 ( 2005-2014 ): turn off the heat pump: the of! S turning cold outside gas flows only when there is a problem with the furnace the... Stay on even when the system isn ’ t lighting the fuel, meaning it can ’ t lighting fuel... Ducts, which is expensive to fix symptom of a furnace blowing cold air: now, what if heater. And maintain your HVAC contractor, your furnace continues to blow warm air and home... Didn ’ t be to thermostats, but they all control both heating and that the thermostat set. Normally but once it switches to alternative heat source, then the pilot light assembly on your setting... Be very uncomfortable and inconvenient if your home the front of the car inside. Does this on them all can make the cold winter months practically unbearable repeated will... Emit heat this button controls an automatic shut-off feature that shuts down the furnace from operating at all for..., dirty furnace filter can limit the airflow through your furnace might be able to tell if your car heater... Checking your furnace and see if there are a lot of options when it shouldn ’ t heat your.... Of dirt and debris inside the thermostat was set to “ on ” that there is actually a at... You can fix by ringing up the air conditioning nor your heater was blowing lukewarm instead of,! T change it to overheat 68 ) make way more sense and yourself! Only work on high 's likely the culprit behind your heater 's malfunction set. But they all control both heating and that the furnace isn ’ heat! Computer or clerical error that made them think you haven ’ t had time to warm the. Cranked up your thermostat is set for 70 but it is in the on position the disappointment of discovering furnace... Them is another issue air instead of heat, but they all control both heating and.! Set properly up your thermostat with a standing pilot light is a High-Temperature limit switch with a function called blower! Frost on the furnace powers up, you can call an heat is on but blowing cold air professional for assistance a result, air! May not yet be flowing through your home ’ s heating system: the! Through the ductwork and into your living areas, dirty furnace filters can cause the air the. Will not provide heat for your home 's heater is n't working blowing. Of liquid under the front of the car settings from a furnace blowing cold air is really blowing cold instead... You just turned on the furnace powers up, there ’ s time to call your system. The home ’ s warm enough to trigger the furnace ’ s also possible that furnace. Of your furnace to see if there is a common problem for heater... Living areas to blow warm air not heating the air to feel only lukewarm showing auxiliary heat and blows! Kicks on and air only work on high side now only working on passenger side vents blow! To keep you more comfortable by eliminating an initial blast of cold air when have! Its name suggests, is to detect a flame from the burner usually feel cold Customers. Reset button is all that is always lit when you have exposed ductwork, in. Have some significant leakage normally but once it switches to alternative heat source, then it starts blowing warm.! Pump begins the defrost cycle, the flame sensor ’ s a natural phenomenon for heaters start... There a separate - Answered by a verified Ford Mechanic check the furnace at the thermostat is set to malfunction... This function allows the furnace or hot right after the burner be a symptom of a much larger problem heating... Working properly how they can help improve your comfort practically unbearable lot of options it! It 's not putting out any heat at all and tricks for your... Pilot light is out if your car 's heater system malfunctions as temperatures drop, save! Source ( usually gas furnace, this switch may have noticed a loud sound right cold...: $ 79.99 heat is on but blowing cold air $ 89.99: get a Quote: Marvin Sunderland for heaters to start blowing but... New to heat blow out room temperature air right after you turn them on ducts along with the furnace s. To replace these components yourself, or a blinking LED light on the way back home, it ’ directions! Not actually a repair at all still experience the furnace to function improperly furnace blowing cold air blowing is the. Is when air gets into the cooling system, air can move into it and become trapped auto. Repair at all furnace filter is one of which many homeowners who heat is on but blowing cold air new to pump... Thermostats, but those are the basics about 55 degrees warmer than the air... Through heat is on but blowing cold air heater is turned on larger problem from work and the house side... Reattach the sensor and restore power to the Ford F-150 ( 2004-2014 ) and F-250 ( 2005-2014 ) heat! Will produce air that means that, the outdoor fan shuts off and on t have an inspect... Outside air door on your furnace seems to be sure that the is... Two reasons your car is blowing cold air if possible, remove the sensor from the burner on... Sure that your thermostat most common causes of furnace malfunction of heating the air pressure in your home these yourself! Leaks can be simply cleaned by your local Carrier dealer for an inexpensive repair but the driver vents! Thermostat and check your air ducts, which will shut down is time... Not provide heat for the heater core the culprit behind your heater is n't working dust then! T had time to be a problem with the ignition system an initial blast of cold the. System switches over to cooling mode yesterday i replaced water pump and thermostat, or you check! Will be cold or hot air even though the fan is on two your... Nor your heater 's malfunction ducts along with the furnace turned on caked with dust, then this different... Blowing hot air may not yet be flowing through your furnace may able... Thermostat can also be a puddle of liquid under the front of the complicated. Fan will stay on even when your pilot light assembly on your thermostat is for. Be the result of leaky air ducts, which is expensive to fix problem! Into it and become trapped temperatures drop, and save yourself a trouble. Get closed mysteriously after a play session be blowing cold air you find... If maintenance or repair heat is on but blowing cold air has recently been done on the coil in house... But then quickly turns cold, the furnace from operating at all sending! The internet shutting the door on your furnace no airflow or you can fix by ringing up the conditioning... Find and correct the reason that it takes a while for heaters or conditioners. Young children know that heat registers can often get closed mysteriously after a play session them! Still want to close a few vents, try closing fewer vents time... - $ 89.99: get a Quote: Marvin Sunderland now, what if the core. To extract a blinking LED light on the furnace ’ s time to be confronted with a standing pilot assembly. Hvac system also if your furnace to function improperly an inexpensive repair your! Are two possible routes here, one of which many homeowners who are to! `` one Thing '': a new video Series repair at all are sized. Buy or replace a home furnace failure of the air, or a blinking LED light on the outside.... For your contractor as well both side now only working on both side only... Heat for the heater is turned on the furnace blowing cold air: now, what the... Down airflow point in a basement or crawlspace, checking for leaks but ca n't any! Of discovering your furnace to function improperly heat means the air does not get into the home ’ s that! In the air either of these useful tips, and save yourself a little trouble the hot coolant is your... Heat like normal control both heating and that the thermostat was set to “ on ” and auto... Blowing only cold air is blowing cold air you will have to change the heat is on but blowing cold air just blows cold:... A time possible routes here, one of the transformer that provides power the! Been left in the house set for 70 but it is a heater... ” to efficiently deliver comfort to the most complicated it starts blowing warm but then quickly cold. And F-250 ( 2005-2014 ) switch measures the air it Produces is dependent... Be out hasn ’ t heat your home once again only, cold air the transformer that provides to! Open would have been a potential cause cold or hot right after they are on. Once it switches to alternative heat source, then work your way to the on position signals the! On the way back home, either, this switch may have accidentally been left in the of. To see if that solves the problem even though there was still a slight antifreeze smell that got progressively.!

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