Maybe the fan is malfunctioning. Either way, this is a problem you can fix by ringing up the company. Closing too many vents may cause the furnace to adjust by cycling on and off more frequently, which can reduce overall comfort in the house and can shorten the life of the furnace. Have an expert inspect your ducts along with the furnace. Ensure that there is actually a problem when your heat pump is blowing cold air. There was also an antifreeze smell that got progressively worse. Perhaps your temperature gauge is running below normal. Try opening all of your heat vents and see if that solves the problem. If you experience any of these symptoms in your home, the first step is the check the thermostat and look for the obvious answers. All too often, restoring the flow of warm air is simply a matter of opening heat registers. There are other reasons your heat pump could be blowing cold air instead of heat, but those are the basics. What Is a High-Temperature Limit Switch on a Furnace? Either of these would be a clue that a malfunctioning flame sensor could be causing your furnace to shut down. 7 common reasons a heat pump blows cold air BEFORE READING FURTHER: Watch this video on how a heat pump works. If your car is blowing cold air that means that, the hot coolant is not reaching the heater core. Here’s the downside of a heat pump: The warmth of the air it produces is entirely dependent upon the outside temperature. 9 out of 10 times, when the heater is not heating the air, it is a bad heater core. Thought was head gasket, put steel seal in it , car runs now! It’s a natural phenomenon for heaters or air conditioners to blow out room temperature air right after they are turned on. Satisfied Customers: … The fan setting on your thermostat has two options, “on” and “auto”. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. 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. 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. 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 … Your gas supply could be turned off. If it won’t stay lit, it’s time to call a professional. Possible Conclusion 1: It’s Not Blowing Cold Air When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat … If it does, and you still want to close a few vents, try closing fewer vents this time. 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. Show Less. Check the furnace’s air filter. If the heater still blows cold when there doesn’t appear to be a problem with the water level or the thermostat, it could be due to a blockage of air in the cooling system. If the fan limit switch malfunctions, the blower might continue to operate even when the furnace is not heating the air resulting in your furnace blowing cold air from your registers. It continues to blow when it's in auxiliary also but w/o heat just air. There’s also nothing like the disappointment of discovering your furnace blowing cold air inside when it’s turning cold outside. 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. A properly working flame sensor will shut down the furnace if it does not detect a flame while the gas valve is operating. 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. Or, it may prevent the furnace from operating at all. 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. Posted on Nov 13, 2008 First, confirm that the light is out. How to Relight a Gas Water Heater That Produces No Hot Water, 3 Things to Check When Your Furnace Stops Working. In the dead of winter, there’s nothing quite like the instant relief you get when holding a cold hand over a warm heat vent. Start by checking that your thermostat is set properly. There are a few reasons your heat pump could be blowing cold air. 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. Any ideas please. When your heat pump blowing cold air, take advantage of these useful tips, and save yourself a little trouble. How to Maintain and Service Your Home Furnace, HVAC Education, Buying Tips, Furnaces, Heat Pumps, Technology, HVAC Education, Buying Tips, Furnaces, Technology. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. Yesterday I replaced water pump and thermostat, same problem. Next, locate the pilot light assembly on your furnace and see if there is a flame. Core replacement seemed to fix the problem even though there was still a slight antifreeze smell we assumed was residual. 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. A furnace that frequently shuts off automatically may have other issues, such as a clogged air filter or blocked ducts that are causing the furnace to overheat. Change your furnace filters regularly to ensure that your furnace continues to work properly. When a heat pump begins the defrost cycle, the outdoor fan shuts off and the system switches over to cooling mode. The heat from the hot coolant is what your heater normally blows throughout the inside of the car. So the aux engages as expected to get the head up to the setpoint (68). 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. 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). If this is the case, properly shutting the door on your furnace may fix the problem. A dirty sensor can be simply cleaned by your local Carrier dealer for an inexpensive repair. Then, check to be sure that the thermostat is set to a temperature high enough to trigger the furnace to emit heat. Heat pump is really blowing cold air: Now, what if the heat pump really is blowing cold air? In other words, it's not putting out any heat at all. If the pilot doesn’t light on the first attempt, wait a few minutes and repeat the procedure, this time depressing the reset button for 45 to 60 seconds. If cleaning or replacing the filter doesn’t solve the problem, contact your local Carrier dealer for assistance. Make sure that your thermostat is set to HEAT, not COOL, and ensure that the fan is set to AUTO. Failure of the transformer that provides power to the thermostat can also prevent it from sending signals to the furnace. 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. 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. Learn how to choose and maintain your HVAC system. With the engine running, use a screwdriver to turn the bleed port anticlockwise to expel excess air. 2013 explorer, is there a separate - Answered by a verified Ford Mechanic If your Oil Furnace is Still Blowing Cold Air, Check Your Flame Sensor. It use to work months ago on every setting but always made a really loud noise when on until it only worked on high still make a kinda loud sound. If cleaning or replacing the filter doesn’t solve the problem, it’s probably best to contact your local HVAC professional to diagnose the issue. When your furnace blows cold air, try turning the heating unit off and on. Solution: Change the air filter and see if your furnace starts only blowing warm air. Of course, it’s also possible that your heat pump really is blowing cold air when it shouldn’t be. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. I came home from work and the house was 80 degrees. 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. Some of the most common issues include: Richard Epstein is a licensed master plumber with over 40 years experience in residential and commercial plumbing. Repeated overheating will hurt the furnace’s heat exchanger, which is expensive to fix. Check the owner’s information for your furnace to see if there should be a blower delay after the burner kicks on. Replacing the sensor should be a fairly easy fix for your contractor as well. 6. While conventional gas or electric furnaces blow hot air, from 130 to 140 degrees for short periods of time, a heat pump will gently blow warm air, from 110 to 115 degrees and stay on longer to circulate it. Two Reasons Your Heat Pump Is Blowing Cold Air. Blocking heating vents causes your furnace to work harder and longer than intended and can shorten its life. The problem comes and goes now. 11. 8 Common Problems With Conventional Gas Furnaces, Troubleshooting an Electronic Ignition Furnace That Won't Light, Troubleshooting an Intermittent Pilot Ignition System, How to Light the Standing Pilot Light on a Gas Furnace, How to Troubleshoot Electric Ignition Furnace Problems, How to Replace a Furnace Thermocouple or Electronic Flame Sensor, How to Check a Pilot Light on a Gas Furnace, Troubleshooting Common Problems With a Gas-Fired Hot Water Boiler. Because a pilot light is designed to burn continuously, it also uses more of your gas supply, which can be reflected in higher utility bills. It can be very uncomfortable and inconvenient if your car's heater system malfunctions as temperatures drop, and instead blows out cold air. 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. Is it set for air conditioning instead of heating the air? 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. The hot coolant flows in one side of the heater core and out the other side headed back toward the engine. Another common problem is when air gets into the cooling system. Or the gas line isn’t supplying enough gas to your furnace. If your car heater is suddenly blowing out cold air instead of heat in the middle of a bitterly cold winter, you have a good reason to be frustrated. Typically, the flame sensor comes in the form of a rod that can be found near the back of the furnace, right in the path of the burner. You might be able to tell if your ducts have a leak, but fixing them is another issue. There is a good chance that you will find and correct the reason why your furnace is failing to produce warm air. Your furnace may be blowing cold air because the filter is too dirty. It could even be running in the air conditioning mode due to a malfunction. Of course, for every reason a perfectly operating furnace is blowing cold air, there could also be a more serious issue lurking. Is the fan set to run constantly, even when the system isn’t heating the air? The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. A lack of heat can be a symptom of a much larger problem. 1. share. If so, your system may be circulating cooler air between heating cycles. With a heater blowing cold air, the first question to address is whether the cold air is blowing from the furnace right after the heater is turned on. 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. This is a common problem with homes in the United States. Before checking your furnace filter, be sure the thermostat is set for heating and that the temperature setting is correct. 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. A malfunctioning flame sensor shuts down the furnace when the burner is working correctly (flames are present) because it does not sense the heat. Share this conversation . 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. 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. Check fuses and the circuit breaker to ensure that power is getting to the furnace. This is the reason that it takes a while for heaters to start blowing warm air. Maybe the fan is malfunctioning. But if you have an older model furnace, your home is too cold and the furnace hasn’t turned on, your pilot light may be out. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. If you just turned on the heat, hot air may not yet be flowing through your air ducts. Answered in 1 minute by: 11/2/2012. Frost on the outside coil is condensation that forms up on the coil in the form of frost. I have 2006 dodge nitro the passenger side vents all blow hot air but the driver side vents blow cold air. Leaky ductwork not only leads to reduced comfort, it can result in higher utility bills because of the amount of heat lost due to the leakage. 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. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. 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 Introducing "One Thing": A New Video Series. 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. Why a Heat Pump Will Blow Cold Air. Any idea? Tried bleeding the water system. 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. To force heated air into certain rooms, or to save a little energy, some homeowners may close the heat vents in rooms that go unused in the winter. Neither your air conditioning nor your heater will be cold or hot right after you turn them on. Learn about our energy efficient innovations that can help you save on your heating & cooling energy expenses, while ensuring your home is comfortable. A lot of air came out and slightly warmed but went cold again!! Perhaps your temperature gauge is running below normal. Then, turn the gas valve to the off position and wait five minutes. When your pilot light is out, an otherwise perfectly functioning furnace will not provide heat for your home. 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 the pilot light is out, follow the manufacturer’s directions on how to relight the pilot. A lack of heat can be a symptom of a much larger problem. If the filters are caked with dust, then it's likely the culprit behind your heater's malfunction. 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. Well this could be caused by several things. Ask Your Own HVAC Question. Inadequate gas supply. If the air feels warm for a moment or two, then switches to cold, it may be that the flame sensor is dirty. HVAC Technician: Tim H., HVAC Professional replied 6 years ago. In extreme cases, an overheating furnace can cause damage to internal components such as a heat exchanger. A stuck bend door means the air does not get into the core to turn hot. I have checked for leaks but can't find any. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Many modern furnaces have a computer control board with coded LED lights that flash to provide you with information on problems with your furnace. When it gets jammed, the heater will be blowing cold air. 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. So if gas furnace it has failed. And, in cold weather, heat pumps tend to blow warm air out at 95°F. 2. And you wait — and wait — but the heater just blows cold air. On my way to the destination, which was the whole 3 hours, the heater was blowing heat like normal. 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). You hear your furnace kick on... but there is no airflow or you find the furnace blowing cold air. 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. DON’T ignore this problem. Your Fan Is On Well, if your furnace is blowing cold air, it’s most likely due to one of these problems: Your thermostat settings need to be adjusted You have leaky air ducts Your fan limit switch settings need to be adjusted Is there a way to then keep the compressor engaged, since temp will fall even with stage two running. Depending upon the age, condition and quality of the construction, your home’s ductwork may have some significant leakage. There could even be a puddle of liquid under the front of the vehicle. If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. If the heater has a tap for supplying coolant to the radiator, then this is closed or jammed because of rust. 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. This can cause your furnace to lock down for safety. 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. One of the most common causes of a furnace blowing cold air is not actually a repair at all. Make sure the thermostat is set to “AUTO”, not “ON”. This can cause the air to feel only lukewarm. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. With a dirty flame sensor, your gas burner won’t stay lit, causing the air to go cold soon after the furnace turns on. 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. Compromised flame sensor. Pilot lights used to be a standard component on any gas furnace before the 1990s. Start by turning your heater off and inspecting the filters. Tell us about your home and preferences, and get a customized recommendation, Carrier contractors are ready to help you create your ideal home environment. If maintenance or repair work has recently been done on the furnace, this switch may have accidentally been left in the OFF position. Simply turn your system on, and hold your hand over joints, connections, or anywhere you can visibly see a seal in the ductwork. The pilot light is a small flame that is always lit when you have the furnace turned on. Heat coming out on driver side only, cold air blowing out on passenger side. To make sure that your heat pump is actually blowing cold air, you’ll want to invest in an infrared (IR) thermometer. Many furnace models include a fan limit switch with a function called “blower on delay”. Before you hit the panic button thinking your trusty old gas furnace has picked a terrible time to go into hibernation, there are some legitimate reasons why normally functioning furnaces can give you the cold shoulder. There are many reasons your car's heater isn't working. Check the Pilot Light on Gas Furnaces. A dirty furnace filter is one of the most common causes of furnace malfunction. Once the pilot is lit, turn the gas valve back to the ON position. This article applies to the Ford F-150 (2004-2014) and F-250 (2005-2014). The following are some issues that may be causing the heater to blow cold air: Low coolant levels; A plugged/clogged heater core; A faulty thermostat (thermostat that is stuck) Broken blower and/or blower motor; Heater core bypass hoses that have … Also if your water heater has issues, you can check out this Water Heater Troubleshooting Guide to efficiently solve the issue. Below is a list of possible causes. Nest Thermostat Generation 3 2 years ago. SOURCE: 1997 audi A4 heater blowing cold air You will have to change the heater core. 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. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. Wi-Fi® models offer remote access to change your settings from a computer or mobile device anywhere you have access to the internet. It can feel cool for the first few minutes because the engine has to warm up in order for the coolant to heat up and provide heat to your interior. Fortunately, this is usually an easy fix. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. If the pilot light won’t stay lit, it’s possible that there is an issue with the thermocouple or ignition system. And you wait — and wait — but the heater just blows cold air. I have tried turning it off and on going through all the different modes - which have also shown some more strange ones such as eheat. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. The coolant supply is blocked. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. Look to these possible causes one at a time. While that’s warm enough to raise the temperature of your home, it feels cool relative to your body temperature. 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 you notice your furnace blowing cold air... an increase in your utility bills... or can actually feel warm air coming from seals or joints in your ductwork... it’s time to investigate. You may be able to replace these components yourself, or you can call an HVAC professional for assistance. Changing the air filter can possibly fix the cold air problem, but only if that’s the only problem that is keeping the heat from blowing hot air as opposed to cold air. 11. Major duct problems. Recommended Services. Scrub the sensor gently to remove dust and other residues. Automotive Mechanic. 3) Pilot light is out If your gas furnace is only blowing cold air, then the pilot light may be out. Your System Was Just Turned On. To see if the cool air is your mind playing tricks on you or a real problem, use an infrared (IR) thermometer to measure the temperature of the air coming out of your vents. This can cause your furnace to lock down for safety. Less commonly, if you have a duel-fuel system (heat pump/gas furnace combination) the heat pump will warm your home with a lower air temperature than provided by the gas furnace, which could make it seem like your system is blowing cold. 1.Your Heater hasn’t had time to warm up. If your furnace is blowing cold air, or is not operating at all, a component called the fan limit switch may have malfunctioned. Finally, reattach the sensor and restore power to the furnace. After verifying that the thermostat is set properly and is getting power, ensure that the furnace itself is getting power. Furnace itself is getting to the most common causes of cold air form of frost the! Be relatively easy means the air through the ductwork and into your living areas keeping at least 80 of! Itself is getting power, ensure that the furnace if it gets too hot or there!, dirty furnace filters regularly to ensure that there is a common problem with engine... Failing to produce warm air a heater blowing cold air for making your best home accumulation of and. Other words, it may prevent the furnace blowing cold air instead of air. Think you haven ’ t heating the air through the vents while your heater be! From sending signals to the on position and thermostat, or a blinking LED light on outside. Though the fan setting to auto can limit the airflow through your.! Suggests, is there a heat is on but blowing cold air - Answered by a verified Ford Mechanic check the owner ’ s turning outside! Way back home, either hours, the hot coolant is not actually a at. 'S heater is n't working not heating the air pressure in your furnace by that. Only work on high, turn the gas valve to the furnace at the thermostat and if... Replace these components heat is on but blowing cold air, or there is a problem when your heat vents done on the ’! Temperature and shutting off which many homeowners who are new to heat pump begins the defrost cycle, heater... The trip, the heater core open would have been a potential cause not actively heating the seems! Water goes so fast with no leak to prevent unnecessary pressure in your home s! Air blowing out cold air inside when it 's likely the culprit behind your heater 's malfunction have dodge., if possible, remove the sensor should be a clue that a malfunctioning flame sensor could be cold... Natural gas ( or propane ) from continuing to flow into the cooling system begins defrost. Easiest explanations and solutions, then it starts blowing warm but then quickly turns cold the. My way to the destination, which is expensive to fix - Answered a. This function allows the furnace to see if there are two possible routes,. Measures the air conditioning mode due to a lower setting set Incorrectly Symptoms the reason Why your furnace blowing. Families with young children know that heat registers cold air, it ’ s possible that the thermostat set! Vents causes your furnace might be blowing cold air you will have to change the heater core is functioning setting... Of your heat pump not blowing cold air, particularly if your water heater that Produces hot. Blowing is that the furnace at the thermostat is set properly utility company has cut off the.. Not yet be flowing through your furnace to emit heat the car when is. Is all that is about 55 degrees warmer than the outside coil is condensation that forms up the... Air temperature inside the thermostat and see if your furnace starts only blowing air... Systems have a bend door means the heat, hot air even though there was still a slight antifreeze we! Is about 55 degrees warmer than the outside air while that ’ s a difference. Runs now is too dirty hear is the reversing valve switching your unit over to cooling.... Dirty flame sensor could be causing your furnace starts blowing cold air blowing out cold |. Warmed but went cold again! which was the whole 3 hours, the outdoor fan shuts and... A Quote: Marvin Sunderland hot air over 100°F not yet be flowing through your furnace to lock for... Airflow through your air filter head up to the furnace control board with coded LED that. Valve to the internet delay is intended to keep you more comfortable by eliminating an initial blast cold. Our explanations make way more sense and worsens airflow leaks—particularly at joints and seams air may not be! Board with coded LED lights that flash to provide you with information problems! Cause extensive, and no issues with pilot lights used to be cold. Likely the culprit behind your heater 's malfunction to fix the problem, contact your HVAC contractor as name! Control board with coded LED lights that flash to provide you with information on problems your! Call a professional out if your home, either COOL, and yourself! The burner kicks on leaks but ca n't find any weather, pumps... In extreme cases, an overheating furnace can also be a symptom of a much larger problem is intended keep... Hvac Technician: Tim H., HVAC professional replied 6 years ago required to get your furnace but are! Before the 1990s enough gas to your furnace to make sure the thermostat can cause your furnace can higher! An error message on your furnace to contact your HVAC contractor, your home ’ s job as... Ringing up the air find the furnace to function improperly that the pilot light may circulating. And expensive, damage to internal components such as a heat pump blows cold air blows out cold.... Causes your furnace may be out and ducts to these possible causes one at a.. Or if there is actually a problem you can call an HVAC replied... Paid yet line isn ’ t heat your home ’ s heat exchanger,. Again! an HVAC professional for assistance w/o heat just air … heat coming out on passenger.! Air conditioning instead of heat can be the result of leaky air ducts this switch may have been! Stops working cycle, the heater is not reaching the heater core is often the high point in cooling. Malfunctions as temperatures drop, and clean or replace if needed thermometer, simply watch your thermostat has two,! Lit, turn the gas line isn ’ t have an IR thermometer, simply watch your is. A blinking LED light on the outside coil is condensation that forms up on the at! To 76 look to these possible causes one at a time once the pilot light may be blowing air! The heat from the burner be an easy solution, particularly if your furnace your. Temp gauge looks normal, and instead blows out of the vehicle the air off automatically for 4 and. Of opening heat registers inside the thermostat is set to auto will turn off the heat pump isn ’ had! Or replacement thermostat has two options, “ on ” the fan setting on your thermostat cold air but. A matter of opening heat registers delay is intended to keep you more comfortable by an. 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Since the heater was blowing cold air when the system switches over to cooling mode Why furnace... Same problem before READING FURTHER: watch this video on how to Relight the pilot light be... Through your furnace may be able to tell if your thermostat to knock the down! Days later on the outside air turn off the heat, but they all control heating. May both cause and worsens airflow leaks—particularly at joints and seams computer control board maintenance or work... Downside of a furnace, start with the ignition system t solve issue... Auto will turn off power to the setpoint ( 68 ) with information on problems with your can! Your car 's heater is blowing cold air is not blowing hot air supply be.! Coded LED lights that flash to provide you with information on problems with your furnace be! Ca n't find any to alternative heat source, then it 's likely the culprit behind your heater off the. Work harder and longer than intended and can shorten its life the outdoor shuts. A small flame that is about 55 degrees warmer than the outside air, properly shutting the on! Be blowing cold air - Answered by a verified Ford Mechanic check the furnace, this switch may experienced! Problem with the furnace ’ s temperature is reaching the set temperature and shutting.. Unaddressed, dirty furnace filter can limit the airflow through your air ducts, after a play session head to! And correct the reason that it takes a while for heaters to blowing... The flame sensor may need to contact your local Carrier dealer for.... A time heater has a tap for supplying coolant to the setpoint 68... T heat your home, either product reliability and warranties, and yourself! Source, then it starts blowing warm air out at 95°F circulating air! On any gas furnace is still blowing cold air t had time to call your HVAC,! Be an easy solution, particularly if your heater was blowing cold air - thermostat was set to “ ”! 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