Why is my furnace blowing cold air - There is a 25 year old gas furnace in the house we rent. (The guy that owns the place claims there is NO problem at all. He said the igniter is brand new and working fine.) It blows cold air for the first 10 minutes of each heating cycle. (Sometimes this happens for 30-60 minutes.) Then heat starts to appear fine.

 
Having the fan on continuously can blow cold air into your living spaces in between heating cycles. Pilot Light Is Out. If you have an older gas furnace model that still has a traditional pilot light, a common issue leading to a furnace blowing cold air is a pilot light that has gone out. If you’re comfortable doing so, relight the pilot .... Home air filtration

Check the pilot light: If you have a gas furnace that’s blowing cold air, the pilot light may be to blame. When it goes out, your furnace stops being able to output heat as it should. If your pilot light is extinguished, carefully follow your furnace’s instructions for relighting. If it won’t stay lit, call a professional furnace ...Sep 25, 2018 · REASON #2: YOUR THERMOSTAT IS MALFUNCTIONING. If you have ensured that your pilot light is indeed on, then the next reason for the furnace blowing cold air could be your thermostat. Thankfully, it’s easy to troubleshoot the thermostat yourself to discover if it is working properly or not. First, make sure that the temperature on your ... Solution and Cost: Replace the pressure switch for the cost of the part, which ranges from $20 to $50. Or call an HVAC technician to confirm the diagnosis and replace the pressure switch for $115 to $200. …Jul 23, 2023 · 8 Reasons Why Your Electric Furnace is Blowing Cold Air. 1. Thermostat Settings. Your thermostat settings could be causing your furnace to blow cold air. The fan setting might be set to ‘ON’ instead of ‘AUTO’, causing the fan to blow air even when the heating elements are not active. Ensure your thermostat fan setting is on ‘AUTO ... Check the pilot light: If you have a gas furnace that’s blowing cold air, the pilot light may be to blame. When it goes out, your furnace stops being able to output heat as it should. If your pilot light is extinguished, carefully follow your furnace’s instructions for relighting. If it won’t stay lit, call a professional furnace ...It does this because it can’t remove the water that it needs to remove from its components. This could cause your furnace to start blowing warm or cold air when you want hot air. The solution to this problem is taking better care of your condensate line. Make sure to clean yours regularly to avoid this.Feb 19, 2020 ... The cold air mixes with the hot air from your furnace and pulls the temperature down. That's a common reason for heating blowing cold air.Why is my furnace blowing cold air? You could be dealing with a faulty pilot light. Older units are equipped with this, which is just a small flame that is necessary to light the furnace burners. Newer units run much more efficiently and use alternative ways to light your furnace. New units will typically come with an electric igniter that ...There are several reasons why your furnace might be blowing cold air. Here are some of the most common: Thermostat Settings – If your thermostat is set to “ON” instead of “AUTO”, the blower will continue to run even when the furnace isn’t heating the air. This could result in cold air being blown out when the furnace …Dirty air filters are a very common issue for furnaces blowing cold air. This is because they limit airflow. Restricted airflow can cause your furnace to run longer which in turn can cause your system to overheat. When your system overheats, you will only feel cold air. The solution is to replace your dirty air filter with a clean one.Jul 13, 2022 · Why is my Goodman furnace blowing cold air? There are a few potential reasons why your Goodman furnace may be blowing cold air. One possibility is that the furnace is not receiving enough power, caused by a tripped circuit breaker or a blown a fuse. A dirty furnace air filter may be the cause of the overheating problem. The primary electrical function of your heater is to run the blower motor. If your gas furnace is blowing cold air, it is a sign that there is an electrical connection. However, your heater may want a particular amount of volts (above 12V) to operate correctly and trigger the other heater functions. Even when your AC power is converted to the ... 8. Lack of Maintenance. One of the most common reasons why a heat pump might be blowing cold air in heat mode is due to a lack of HVAC maintenance. Over time, dirt and debris can accumulate in the unit, which can impact the heat transfer process and reduce the heat pump’s efficiency.Furnace Blowing Cold Air Because There’s no Fire. Your furnace blowing cold air may be a result of the ignition not starting. When your ignition does not start a fire in the burner, your furnace cannot heat the air. This problem is usually caused by a broken thermostat, a faulty circuit control board, a lack of fuel, or a bad electric furnace ...In short, a furnace blowing cold air is a serious problem. Most of the causes are systematic, requiring the help of a professional contractor, while a few are simple enough to tackle on your own. Some of the most common reasons furnaces blow cold air: Your Furnace Hasn’t Warmed Up Yet. Even the best furnaces require a few …A defective thermostat is another possible reason why your thermostat may be continuing to blow air even when it’s turned off. Over time, thermostats can become damaged or worn out, leading to malfunctioning. One sign of a defective thermostat is if your HVAC system is constantly running, even when the thermostat is set to “off.”.Is your furnace blowing cold air? It could be an easy fix. In this episode of Repair and Replace, Vance show how to troubleshoot a furnace that is not blowin...Sometimes, a furnace blows cold air due to damaged or leaking ducts. Leaks in ductwork allow heat energy to escape, so once heated air reaches your living areas ...Before trying to check the air filter, ensure the furnace thermostat is in the OFF setting. Next, locate the filter, which is typically next to the blower in the furnace assembly. If the filter is dirty, replace it with a clean filter as soon as possible. Once you turn the thermostat back on, the furnace should resume …It can also overheat your furnace and shut down the automatic heating cycle so you feel cold air blowing from your vents. Replace a dirty filter with a clean filter, give the furnace a chance to cool down and reset, then try again to increase the heat temperature on your thermostat, and feel your vents to see if warm air is blowing.Take a look at the temperature setting on the thermostat and the temperature inside the house. Digital thermostats should display both values. When the thermostat’s setpoint is 74f degrees and the thermostat reads 74f or above, and the blower is still operating, the faulty sensor could be the cause.6. Gas supply problems. Thermostat and pilot light aside, the fact that your furnace is only blowing cold air could indicate an issue with the gas supply line. …A clogged air filter restricts airflow, significantly reducing the efficiency of your furnace and possibly leading to it blowing cold air. Locate the filter, which is typically found in the return air duct or blower compartment. Turn off the furnace before removing the filter to examine it.A defective thermostat is another possible reason why your thermostat may be continuing to blow air even when it’s turned off. Over time, thermostats can become damaged or worn out, leading to malfunctioning. One sign of a defective thermostat is if your HVAC system is constantly running, even when the thermostat is set to “off.”.Without the heating, the blower will just blow out cold air. You need to check if your gas pilot light has gone out. To check it, just locate the pilot and see if it won’t light or if it … Furnace is not working. Is your furnace blowing cold air or not turning on? This video will show you where you should start with your furnace troubleshooting... 8 Reasons Your Furnace Isn’t Blowing Hard Enough. The following are the eight most common reasons why your furnace may not be blowing as hard as it should be; 1. Dirty Air Filters. You’ll come across “dirty air filters” a lot when troubleshooting furnaces, and for a good reason. Dirty filters put a lot of strain on the furnace ...No matter what brand of furnace you own or how many times its light is flashing at you, our skilled heating and air conditioning service technicians can restore comfort to your home. If your furnace is experiencing some issue, find your nearest ARS/Rescue Rooter location or call us at 866-399-2885 to book an …Why is my furnace blowing cold air? Heartland Heating, Air & Plumbing explains when to call for furnace repair in Murphysboro, IL. Family Owned & Operated Since 1946 | Proudly Serving Murphysboro, Carbondale & Surrounding Areas. Search Submit Clear (618) 684-4328.A defective thermostat is another possible reason why your thermostat may be continuing to blow air even when it’s turned off. Over time, thermostats can become damaged or worn out, leading to malfunctioning. One sign of a defective thermostat is if your HVAC system is constantly running, even when the thermostat is set to “off.”.To check whether the problem is with the Nest orientation settings or not do the following. 1)Put the thermostat on heat and raise the temperature a bit higher than the current room temperature. 2) Wait a few minutes and if cold air blows out of the vents. There is a good chance that the orientation for the thermostat is not set properly.#3 – The Furnace Has Overheated. If you can’t get your furnace to blow any air, hot or cold, it’s possible it has overheated. Safeguards are in place that shut off the burners when the unit gets too hot. More often than not, the problem is a dirty air filter. Furnace filters should be checked frequently for dirt and debris.A dirty air filter will restrict the air flow in and out of your furnace which can cause it to overheat. If your furnace overheats, the safety control will shut off the burners causing the fan to blow cool air versus heated air through the house. Check the Pilot Light Your furnace may be blowing cold air because the pilot light has …When your furnace breaks down, finding a reputable and efficient repair service can be a daunting task. The last thing you want is to be left in the cold while waiting for a techni...No matter what brand of furnace you own or how many times its light is flashing at you, our skilled heating and air conditioning service technicians can restore comfort to your home. If your furnace is experiencing some issue, find your nearest ARS/Rescue Rooter location or call us at 866-399-2885 to book an …Dec 30, 2023 · Your furnace troubleshooting steps will depend on the precise nature of the problem: if your furnace is blowing warm air and then cold air, it may be due to an overheating furnace or pilot light/flame sensor issue. If, on the other hand, your furnace is only blowing cold air, the cause is more likely to be the thermostat or ductwork. Check the pilot light. If it’s out, that’s why your furnace is blowing cold air. Sometimes the light just blows out, but it could also be a sign of another problem. If you know how, …Fan settings. – Oftentimes, it’s the fan settings that cause your furnace to blow cold air. If you have your fan set to “always-on”, it will inevitably blow cold air out when your furnace is having some downtime. The solution here is to set your fan to “auto” so it can correlate with the furnace.A simple enough reason a furnace is blowing cold air sometimes is that the wrong thermostat settings are in use. Make the thermostat your first stop as you troubleshoot this issue. Make sure the thermostat is set to HEAT, not COOL. If someone accidentally bumped the thermostat or set it incorrectly, the reason why … If you have an older furnace, find the switch box. Check to see if the auto/manual switch is stuck; it should be in the “auto” position (the “manual” setting will make the blower run continuously). Pull off the cover; if the dial is showing an on-off range of 100-150 degrees, then adjust the lower pointer to below 100. So, when it starts blowing cold air, it’s not just a minor inconvenience — it’s a disruption of your comfort, energy efficiency, and even your well-being. Let’s dive into the heart of the matter and uncover the reasons behind the heater blowing cold air.If you find your furnace blowing cold air, you may have a dirty or clogged air filter. To make sure, remove the air filter and inspect it. If it’s clogged with dust, clean it with compressed air or wash it in warm water with mild soap or just buy a new one. It’s recommended that you change your air filter twice every year.Check the pilot light. If it’s out, that’s why your furnace is blowing cold air. Sometimes the light just blows out, but it could also be a sign of another problem. If you know how, carefully try re-lighting the pilot. If you’re not comfortable with that or run into problems, call a Phoenix furnace repair company. 11 – No Fuel for FurnaceIn short, a furnace blowing cold air is a serious problem. Most of the causes are systematic, requiring the help of a professional contractor, while a few are simple enough to tackle on your own. Some of the most common reasons furnaces blow cold air: Your Furnace Hasn’t Warmed Up Yet. Even the best furnaces require a few …Your furnace troubleshooting steps will depend on the precise nature of the problem: if your furnace is blowing warm air and then cold air, it may be due to an …When your furnace breaks down, finding a reputable and efficient repair service can be a daunting task. The last thing you want is to be left in the cold while waiting for a techni... A furnace blowing cold air means you are losing money and everyone is bundled up and shivering inside. The web page explains how your furnace works, the possible causes of cold air, and how to troubleshoot and fix them. You can also get furnace repair from an HVAC pro if you need help. Oct 25, 2023 · 2. Clogged Air Filter. Dirty air filters are another common cause of many HVAC problems—including blowing cold air when the heat is on. That’s because blocked filters can restrict airflow within your HVAC system, causing your furnace or heat pump to stop working properly. HVAC Technician: Yes, if furnace shuts down, you should get a flash code. Unless it's a issue. Another thing you can do to speed up the diagnosis is to go up by the furnace and have someone initiate a call for heat. Observe this with the cover off and tell me what happens. The sequence should be: 1.A furnace fresh air intake vent is a furnace vent connected to the outside of a home that allows fresh air to enter. The fresh air is then heated by the furnace and distributed thr...Dec 20, 2022 ... Your furnace may be blowing cold air because the filter is too dirty. A dirty air filter blocks airflow over the furnace's heat exchanger, ...Oct 23, 2023 · Step 2. Clean the Furnace Filters. If the furnace filters are dirty, they can cause problems with the RV furnace, producing cold air. The filters collect dust and debris and eventually clog, causing poor airflow. The furnace system’s blower motor will have to work harder, leading to reduced heat production. It does this because it can’t remove the water that it needs to remove from its components. This could cause your furnace to start blowing warm or cold air when you want hot air. The solution to this problem is taking better care of your condensate line. Make sure to clean yours regularly to avoid this.Why is cold air blowing when the heat is on? Cold air blowing when the heat is on can indicate various issues with your furnace. It could be due to a malfunctioning thermostat, clogged air filters restricting airflow, or a pilot light that needs to be relit. Another possibility is dirty burners hindering heat generation.It keeps blowing and while cold air is blowing out the registers, cool air is also blowing out the intake vent grill (right in front of the furnace filter!!) ... I'm still surprised that the temperature took so long to drop only because the furnace and air are in the center of the one floor house that's less than 750 sq. ft. (We're …Dec 20, 2022 ... Your furnace may be blowing cold air because the filter is too dirty. A dirty air filter blocks airflow over the furnace's heat exchanger, ...Mar 11, 2021 · The most common cause of heating issues with an electric furnace is due to the air filter. When the air filter gets dirty, it can block the necessary airflow to the heat exchanger. Basically, this leads to the furnace overheating, even potentially breaking the heat exchanger. Start by finding the air filter and cleaning or replacing it. Nov 16, 2023 ... A problem with the furnace's heat exchanger can cause it to blow cold air. A cracked heat exchanger is a serious issue that can lead to ...Installing a furnace humidifier can be a great way to improve the air quality in your home and keep your indoor environment comfortable during the dry winter months. However, the c...No matter what brand of furnace you own or how many times its light is flashing at you, our skilled heating and air conditioning service technicians can restore comfort to your home. If your furnace is experiencing some issue, find your nearest ARS/Rescue Rooter location or call us at 866-399-2885 to book an …Your furnace may be blowing cold air because the pilot light has gone out. It is a simple fix, just relight the pilot. If it continues to go out after you relight it a few times, then you should call us at 206-784-8101 or request service online. This is indicative of a bigger problem that requires professional help.Dec 20, 2022 ... Your furnace may be blowing cold air because the filter is too dirty. A dirty air filter blocks airflow over the furnace's heat exchanger, ...Mar 17, 2020 ... Check your thermostat settings. If your home's temperature seems steady, but not as warm as you'd like, your thermostat settings may be the ...Furnace Blowing Cold Air · What Causes a Furnace to Blow Cold Air? · Thermostat is Set to ON Position · Your Furnace Has Overheated · Furnace Pilot Ligh...Air Filter: A clogged or dirty air filter can restrict airflow and cause your furnace to overheat, triggering the safety mechanism to blow cold air. Regularly check and replace the air filter, usually every 1-3 months, to ensure optimal performance and efficiency. Pilot Light or Ignition Issues: For gas furnaces, a malfunctioning pilot light or ...Check Furnace Air Filter. A second reason that your heater might be blowing cold air instead of warm air is due to a faulty furnace air filter. Furnaces fit with a clogged filter or dirty air filter can cause the heater to work overtime in order to compensate for the lack of indoor airflow and waste energy. To fix this issue, clean or replace ...Reasons Your Furnace is Blowing Cold Air. If your furnace is blowing cold air, there could be several reasons behind this issue. Here are some common explanations: Thermostat Settings. One of the most common reasons for a furnace blowing cold air is an incorrect thermostat setting.Why is cold air blowing when the heat is on? Cold air blowing when the heat is on can indicate various issues with your furnace. It could be due to a malfunctioning thermostat, clogged air filters restricting airflow, or a pilot light that needs to be relit. Another possibility is dirty burners hindering heat generation.Possible Causes of a Furnace That Won’t Turn Off and Is Blowing Cold Air. We’ve talked in the past about the causes behind air conditioners blowing hot air, but today I’d like to discuss the opposite: a furnace that won’t turn off and is blowing cold air. There can be many reasons for this, but there are three common ones.Furnace is not working. Is your furnace blowing cold air or not turning on? This video will show you where you should start with your furnace troubleshooting...If your furnace blows cold air, check the air filter and vents. If the filter is clear and each vent enough space, call for a furnace repair. Otherwise, you run ...If it doesn't generate heat within a minute or two, it needs an inspection followed by a furnace repair. Why Your Furnace Is Blowing Cold Air. More often than not, a heater blowing cold air has either insufficient air flow, electrical connection issues, or a minor maintenance problem, like a broken …The Pilot Light Is Out Or Faulty. Older furnaces use standing pilots. The pilot light is a small …Reliable Furnace Repair & Installation Services. If the furnace in your home is blowing cold air, give us a call by phone at (703) 543-9649 or fill out our Service …The thermostat is responsible for controlling the heating and cooling cycles of your HVAC system. If it is not functioning properly, it may be erroneously signaling your system to blow cold air even when you’ve set it to heat. This can be due to a calibration issue, a faulty sensor, or a loose connection.#3 – The Furnace Has Overheated. If you can’t get your furnace to blow any air, hot or cold, it’s possible it has overheated. Safeguards are in place that shut off the burners when the unit gets too hot. More often than not, the problem is a dirty air filter. Furnace filters should be checked frequently for dirt and debris.If this is the case, cleaning it will probably make the problem go away. If the furnace is coming back on on its own, then: dirty air filter. Chimney is clogged causing exhaust to come back down the chimney (backflow) Backflow sensor is clogged/broken. Flame sensor is dirty/broken. Control board is faulty. Checking the sensors is probably …Sep 25, 2018 · REASON #2: YOUR THERMOSTAT IS MALFUNCTIONING. If you have ensured that your pilot light is indeed on, then the next reason for the furnace blowing cold air could be your thermostat. Thankfully, it’s easy to troubleshoot the thermostat yourself to discover if it is working properly or not. First, make sure that the temperature on your ... Jun 23, 2023 · Introduction: The Furnace Conundrum. Imagine it’s a chilly winter night and you’re settling in for a cozy evening at home. You crank up the heat, expecting a warm embrace, but instead, a gust of cool air greets you. A furnace blowing cold air in the dead of winter can feel like a cruel joke. A dirty air filter could cause your electric furnace not to blow hot air for several reasons. For instance, dirt and debris can make their way to the heating elements. Clogged heating elements won’t heat properly to give you the warm air you crave so much. And not just that.When cold air blows out of your furnace, the cause may be a pilot light that has gone out. The pilot light is essentially what ignites the furnace and keeps it ...A clogged filter is one of the leading reasons for a heater blowing cold air. But even if you swap the air filter with a brand new one, dirt and debris can still be found within the unit. This could eventually lead to overheating. If your furnace looks pretty dirty, call an HVAC provider for a professional clean.Dec 20, 2022 ... Your furnace may be blowing cold air because the filter is too dirty. A dirty air filter blocks airflow over the furnace's heat exchanger, ...A furnace blowing chilly air is a typical problem with several possible explanations. While some issues are easily fixable with basic troubleshooting, others necessitate the knowledge of Sacramento appliance repair pros. Investing in home appliances' regular maintenance and knowing their importance can help prevent the issues in …So, if your blower won’t stop running even when the heater is off, then there is a problem. Here are a few possible causes: A wrong thermostat setting (ON instead of AUTO). A faulty thermostat wire. A fan limit switch that’s set on “manual override”. A faulty fan limit switch wire.There is a 25 year old gas furnace in the house we rent. (The guy that owns the place claims there is NO problem at all. He said the igniter is brand new and working fine.) It blows cold air for the first 10 minutes of each heating cycle. (Sometimes this happens for 30-60 minutes.) Then heat starts to appear fine.Check The Thermostat. One of the most common causes of a furnace blowing cold air is not actually a repair at all. If you notice your furnace only blows cold air on occasion …The cold air coming from your furnace could be due to a malfunctioning circuit board, damaged ductwork, a faulty igniter, or any number of more serious problems. These are issues your HVAC tech can easily address. If you live in the Atlanta area, the HVAC professionals to call are Assured Comfort Heating, Air & Plumbing.Cold air return vents work by allowing cool air to be suctioned into a furnace or heating/air conditioning system. The cool air is then heated or cooled, depending on the system se...If your RV Dometic furnace is blowing cold air, hit the mode button and turn the fan on AUTO. Hi and Low on the fan controls the air conditioning. Stay warm!...

Furnaces are complex systems and one obstruction can cause the whole system to quit working. Some furnace repairs can be a simple fix, while others require professional help. If your vents are blowing cold air, there could be many causes. Below are five potential reasons your furnace is distributing cold air in West …. Film about elvis presley

why is my furnace blowing cold air

To fix this, just turn off the furnace, carefully top up the oil, and turn the furnace back on. Once there is oil in the tank, the burners should fire up and heat up the furnace. 6. Low Battery. Another reason your furnace could be blowing cold air is because the battery in your thermostat could be low.If your furnace turns the blower on but the burners are not lit, cool air may be circulated. In modern furnaces, a flame sensor is used to detect the flame and open the gas valve. If this sensor is dirty, the burners will not light, and the system will shut down. Having the flame sensor cleaned can often solve the problem. There is a 25 year old gas furnace in the house we rent. (The guy that owns the place claims there is NO problem at all. He said the igniter is brand new and working fine.) It blows cold air for the first 10 minutes of each heating cycle. (Sometimes this happens for 30-60 minutes.) Then heat starts to appear fine. Fan Settings. It’s not uncommon to notice that your furnace is blowing cold air sometimes, but hot air other times. Often, this issue is caused by the fan settings of the thermostat. When the thermostat is set to ON, the furnace blower motor continuously runs, even when the furnace does not. When the furnace is off and no heat is produced ...Apr 21, 2022 · 1. Comprehensive – We walk through the potential reasons your furnace is not blowing hot air from the most common and easy to solve to more tricky issues. 2. Easy to understand, so homeowners like you have the opportunity to DIY and not call for an expensive repair. 3. Complete with repair cost information. Make sure your thermostat is set to the heating mode and the desired temperature. Also, check the batteries—a thermostat with low or dead batteries can cause irregularities in heating. Adjust the thermostat settings and replace the batteries if necessary.Give it some time, and if the issue persists, move on to the …Gas valve. When fuel is sent to the furnace, a gas valve opens and allows the gas to be ignited and continue to burn. If this gas valve doesn’t open, this can’t happen, and you have an RV furnace blowing cold air. When the furnace is starting, you can listen and hear the gas valve open. It will make a clicking noise when it opens.Dirty or Clogged Air Filter. Another common issue that could result in your furnace blowing cold air is a clogged or dirty air filter. If your furnace won’t blow air …Cold air coming from vents when the heat is off is usually due to a simple setting on your thermostat. Generally, when this issue is happening, the “Fan” setting is set to “On” instead of “Auto.”. When the fan is set to “On,” the furnace’s blower motor (fan) runs constantly. This means the fan pushes air through the …You get cold air because the fan is still working and circulating air that the RV furnace has pulled from the outside, but it’s not heated. The sail switch is typically a lightweight, vertical metal or aluminum bar that moves up with the force of the fan blowing air. The sail switch is typically on the back of your heater with one plug or ...Here are the steps that you should follow if your furnace is blowing cold air: Switch the thermostat setting. Check the control board diagnostic light. Change the …Your electric furnace is blowing cold air because the filter needs to be changed, the ductwork is leaking, or the furnace is not getting enough electricity. Additionally, it could be caused by your furnace’s built-in thermostat not working properly. Throughout this post, I’ll show you why your electric furnace isn’t blowing hot air and ...Oct 23, 2023 · Step 2. Clean the Furnace Filters. If the furnace filters are dirty, they can cause problems with the RV furnace, producing cold air. The filters collect dust and debris and eventually clog, causing poor airflow. The furnace system’s blower motor will have to work harder, leading to reduced heat production. A dirty air filter is one of the most common reasons furnaces overheat and start blowing cold air as a result. The buildup of debris hinders airflow, which can cause a furnace to overwork due to the lack of heat. When this happens, your furnace’s limit switch will shut off the burners completely to prevent a fire, but the fans will continue ...Why is My Furnace Blowing Cold Air and Won’t Shut Off? If your furnace is blowing cold air and won’t shut off, it might be due to a faulty thermostat, specifically …A simple enough reason a furnace is blowing cold air sometimes is that the wrong thermostat settings are in use. Make the thermostat your first stop as you troubleshoot this issue. Make sure the thermostat is set to HEAT, not COOL. If someone accidentally bumped the thermostat or set it incorrectly, the reason why …This is a line in your furnace which moves water away from the heat exchange as moisture builds. If the condensate line is clogged, your furnace can’t ignite. Your furnace will still blow air into your home, but the air won’t be warmed, meaning you get cold air coming in through your vents. Gas Supply: Another issue could be …A furnace blowing cold air indicates that something is amiss with the the thermostat, air filter, pilot light, flame sensor, ducts, condensate line, or gas supply. Learn how to fix the problem yourself with basic knowledge of how furnaces work and the issues that cause cold air to blow from the furnace. See moreDec 19, 2023 ... One common culprit for a furnace blowing cold air is a thermostat set incorrectly. If your thermostat is set to the 'ON' position instead of ' ...The web page explains four possible causes of a furnace blowing cold air and how to fix them. It covers thermostat settings, filter cleaning, pilot light ….

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