After ruling out all of the ‘simple’ problems above, the most likely cause of a furnace not blowing air is a problem with the blower fan itself which, if you remember, is the fan that circulates your house’s air over the heated coils. If you turn your furnace off or the room becomes sufficiently heated to the point where there furnace halts automatically, the limit control switch shuts the blower off to save energy. A furnace problem won’t fix itself. If your furnace is on but no heat is coming forth, the problem could stem from issues with your thermostat. Of course the more you use your unit, the more slime you’ll have in the pipes. You can test the blower fan by turning off the heat — or, depending on your system, setting the thermostat to “fan only” mode — and switching the fan from “auto” to “on.” Wait for a few minutes to see whether any fan breeze comes forth. That outside air in the mix lowers the temperature of the air that’s just come from your furnace. Replace or clean dirty or clogged filters. If you have ruled out all the previous possibilities and even replaced the limit control switch, only to find that the blower fan still switches off, there is something wrong with the heating coils. That water is removed via piping that eventually makes its way outside your home, where the water drains off. Funny as it may sound, a system set to “on” will not necessarily blow warm air. is just 2 years old. Furnace problems, from minor to severe, generally stem from one of the following 10 issues: In a multi-person household, there are liable to be different views regarding desirable indoor temperatures. This, in turn, could limit the ability of your furnace to produce and distribute warm air throughout your home. Those lines have a tendency to get plugged with dirt and grime, especially if you’re not performing regular maintenance on them. Often the initial issue is simple to fix, but can lead to complicated and costly problems if put off too long. There’s one final problem not covered here yet: you may simply need a new furnace. If the blowing mechanisms are inconsistent or non-functioning, there is probably an issue with the blower belt. First, confirm that the light is out. The blower motor itself does not … Maintenance issues again here: if you have a gas furnace that hasn’t been cleaned in a long time, a faulty valve could be the reason for the cold air blowing out of your furnace. Why Is My Furnace Not Blowing Hot Air? it continues to blow out hot air, even when i turn it off at the thermostat, i end up having to turn it off at the main breaker. Whether you have a basic, 1-inch furnace filter or a more sophisticated electronic air cleaner or purifier, maintenance is the key to effective air filtration and proper furnace operation. Pilot lights are used on older, pre-electronic ignition gas furnaces. Ducts that have come unhooked can also develop leaks, Previous fixes involving duct tape can come undone when the tape peels, Ductwork can fracture when it’s not properly screwed together. Troubleshooting Furnaces Not Blowing Hot Air. In the latter scenario, you probably have a damaged limit control switch. Oasis Heating, A/C & Refrigeration is currently OPEN and performing active measures to prevent the spread of COVID-19 for our workers and loyal customers. If not, read the next section about common heat pump malfunctions. Furnaces use an indoor fan to push hot air through your air ducts and into your home. Good value.”, “Would absolutely use their services again. So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. 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. If the igniter is not cracked, use a multimeter to test the igniter for continuity. And, because we’d hate to leave you without any solutions, we’ll also set you up with a few possible DIY fixes for a furnace that’s just not doing its job. The air filter is one of the more obvious parts to check since it is easy to see how a clogged filter would impede the flow of air from a furnace. In other cases where serious problems are involved, professional service is necessary, especially when a gas furnace is not blowing air. If you’re in the Greater Chicago area, schedule your furnace service online or give us a call at (815) 455-7000. If the blowers are working as normal but you feel no heat, the issue is probably due to the temperature settings or heating coils. A heating system will have one or possibly two or three different circuit breakers, any one of which could trip and cause the furnace to stop. I pull the access panel off while the blower is running and it is spinning freely but not … Heating System Installation & Replacement, Oasis Heating and A/C Services in Occoquan, VA, Water Heater Installation and Replacement, Commercial HVAC Installation and Replacement, Keeping Your HVAC System Running Smoothly, Hope For Help 5K Run - Oasis Sponsored Event. With your furnace filter, do an inspection every three months and replace the filter if dirt buildup has taken hold. Without battery power, the thermostat has to rely solely on the power supply of your house. Oil-powered furnaces. To determine if the igniter is faulty, remove the igniter and inspect it for cracks. These range from the face-palm obvious to the slightly complex and technical. Your furnace may be blowing cold air because the filter is too dirty. Is the furnace itself turned on? An electric furnace that is not blowing air could be the result of various problems. Consequently, a thermostat might be turned down at some point during a given day, yet the action remains unbeknownst to the rest of the occupants. Your system can weather a few rounds of overheating, but that can’t go on forever. Below, we'll tackle some possible reasons why your gas furnace might be blowing out not-so-warm air… Thermostat batteries last a long time, however, so you’re more likely to have this be a problem if your thermostat is old. Lack of power or a confusion in the mechanics is your problem here. If you’ve just changed the settings, wait for it to reset. Have you changed your air filter lately? Sunday, November 12th, 2017 at 3:12 pm | Categories: Heating If so, everything is fine. Gather everyone in your household and exit the premise until help arrives. As such, a furnace that is not blowing air through vents across your heating system is indeed problematic. There’s no real need for you to understand how the high limit switch works but suffice it to say you don’t want it to fail. To save energy, the thermostat sets the temperature low. Electric furnaces are reliable, require fewer repairs than natural gas systems, and can last for many years. New furnaces cost on average over $3,000 . Dirt and debris can collect on the valve, causing it to shut down. This could be due to an overheating issue but it could also stem from a misreading on the part of the limit control switch. If you have recently installed a new thermostat on your own, it is quite possible that the installation did not take as well as it appeared. Before you try this step, turn off the furnace and shut off the circuit breaker. The electric furnace is one of the most common. Furnace still not blowing hot air? There are a number of issues that can lead to a nasty blast of cold air when you’re expecting warmth from your heating system. They’re often placed outside the heated area of our home, meaning they are exposed to extreme temperature changes all year ’round. When I turn up the thermostat, it does call for heat, but the air that is blowing is in no way hot. Other potential problems include a bad blower fan or limit control switch. If the furnace is still blowing cold air, check the thermostat batteries. Furnace problems, from minor to severe, generally stem from one of … It’s like putting a blanket on your head and asking you to breathe normally. With so many complex mechanisms involved in a heating system, any given number of issues could cause the furnace to malfunction. But in the meantime, try these fixes we’ve covered here, starting with the simple solutions that you can apply yourself. The fan seems to be working fine, when the temperature dips below what I have it set on , the fan turns on and last year it would take about 10 seconds for the air coming out to turn warm/hot , it would continue running hot, then approx. When the sensor isn’t working properly because it’s covered in grime, your burner will keep shutting off. If you have a gas furnace, check the gas supply to see whether the fuel supply is sufficient. Another component of your HVAC system that requires regular maintenance is the condensate. Furnaces too big will cycle on and off. It was 6 degrees F. this morning and my heat pump was soldiering on with perhaps an occasional boost from the auxiliary electric heat strips at the air … Try changing the air filter and restarting the furnace. 1) Change the furnace’s air filter if it’s dirty. The switch might also be hard to find, another reason you may need the help of an HVAC technician. One of the more elementary oversights that homeowners make is to activate the furnace but leave the thermostat in air conditioning mode instead of heat mode. After you’ve checked the batteries and after you’ve surveyed the other household members for sneaky thermostat-adjusting activities, there’s one more “easy” fix and that’s to change the filter in your heating system. On the upside, your blower motor is working just fine, though the heating-coil problem will require maintenance from a professional HVAC service specialist. They’ll help you assess the right type and the correct size heater for your home. Situations like these have become all-too-common as the market is flooded with fancy self-install thermostat kits that are incompatible with older household heating systems. Do not light any matches or lighters near the furnace. The motor can accumulate dirt over time and the gradual buildup can wear down the system. VA If the coils are faulty, no thermostat settings, clean filters or switch adjustments will do the trick. Thermostat is Set Too Low – Make sure the thermostat is set to a higher temperature than your home, and running on “heat” mode. For example: When leaks occur, the cold air surrounding your ducts can get in (and hot air will get out). Check the fan settings on your thermostat if they are set to “auto” instead of “on”. If your furnace fan is set to ON, the fan runs continuously, whether or not your furnace is producing heat. i replaced the thermostat with a programmable one, it worked fine for a couple of days, but it wont shut off again. If your thermostat’s fan setting is set to ON, then your furnace blower will constantly be operating ever when it is not putting warm air into your home. For example, if you have your furnace set to 70 degrees Fahrenheit, the furnace will shut off the heating coils once the ducts sense an ambient room temperature of 70 degrees Fahrenheit, but the fan will continue to blow cold air if it is set to “on” instead of “auto.”. It is entirely possible for the furnace to be burning away, producing hot air, without enough of that warm air … 7 common reasons a heat pump blows cold air Overheated furnace. If the batteries are old, replace them — remember, if the time or date settings are off, the battery is likely dead. With so many complex mechanisms involved in a heating system, any given number of issues could cause the furnace to malfunction. An old or dirty flame sensor will cause your furnace to blow cold air, too. In that order, here they are: There is actually one more user error that could be the source of your cold air issues. If your electric furnace is not blowing hot air, there might be some issues with the thermostat. Check Your Furnace Blower Fan. To test the quality of the heat itself, raise the thermostat temperature by five degrees and wait for the system to activate. This is different from a furnace, which can blast hot air over 100°F. Consequently, the thermostat thinks that you are at work instead of home reading a book. Knowledgable and neat techs. A clogged furnace air filter can cause two types of problems, one involving blocked airflow and the other concerning tripped shutoff functions. Do you feel warm blowing air? Here are some furnace troubleshooting tips you can try if your heater isn’t blowing hot air. In some cases, the buildup of dust and debris can thicken to the point where the passage of warm air is blocked by the filter. Thus, while you are left with the impression that the furnace won’t blow heat, the furnace has actually overheated and stopped due to a clogged air filter. That’s why the furnace is not blowing hot air. If that’s the case, you’ll definitely want an expert to weigh in before you start acting on the final solution. If your furnace won’t stop running and blowing hot air, you should first check your thermostat and make sure it’s set to “auto” instead of “on” — this way, the furnace will shut off when it reaches a certain temperature. The function of the blower fan is to blow air across the furnace’s heating coils and disperse that warmth through the air ducts. Aside from simple remedies to minor furnace issues, the majority of problems involving a furnace are best handled by service professionals. The purpose of a household heating furnace is to warm your living quarters on an as-needed basis. With just a few short weeks until the official start of Spring, you might be thinking this is a strange time to worry about your furnace breaking down. Electric furnaces. For example, it might be 8 p.m. Sunday in your area, but your thermostat believes that the time is actually 1 p.m. Tuesday. Actually, there are all sorts of perils that can lead to leaky ducts. To fix this issue is simple, just flip the fan switch from “ ON ” to “ AUTO .”. But that fan has two modes of operation: ON and AUTO. Furnaces too small cannot effectively heat your whole home. We hope that you stay safe and healthy during this time. We’ve seen countless homeowners who choose a great new thermostat but it’s simply not compatible with the existing heating system in their home. But if you’ve set your fan to be “on” at all times, it’ll blow cold air during the furnace downtime. Check that your circuit breaker is not off. This is another reason to have your system checked regularly. Some can be self-diagnosed and fixed. Likewise, a furnace that is not blowing air in one room is a confusing issue that could stem from various factors, all of which require immediate attention. The cooler air is what ends up blowing into your living areas. If you feel no heat in the minutes after you activate your furnace, something could be wrong with the belt, heating coils or furnace settings. Motivated and handy homeowners who have the drive can learn how to do this themselves, manually. If your furnace does not seem to be working, the limit control switch could be responsible in one of two ways. Here’s yet another HVAC component that’s vulnerable to dirt and grime-related problems: the furnace’s burner. For example, if the circuit breaker to the furnace is off, the furnace will not generate heat. If so, they might have caused your pilot light to go out. A dirty old filter is a clogged filter and that can restrict the air flow to your HVAC system. HVAC companies have all kinds of specialized tools for clearing out slimy condensate lines. After all, you wouldn’t likely need the house warm during the afternoon of a typical workday. “Great timely service. This warm air is dispersed through the ducts of a household heating system to bring occupied living areas to the desired temperature. If you’ve turned on the heat only to find there’s a chilly wind inside your home, here are ten reasons that could be happening. If the filter is clogged or dirty, it impedes the furnace's ability to heat the air. From here on out, we’ll be moving into a slightly more complex set of furnace issues. Therefore, while it might seem as though the furnace is not blowing air, the only real problem is that the furnace needs a new filter. Thermostat issues come in many flavors with just as many solutions. 1. This can make the air coming out of the vents seem lukewarm. But meanwhile, from your end, all you see is the furnace blower running nonstop, blowing cold air and you have no idea why it’s happening. Watch for the following tell-tale signs of furnace trouble: As outside temperatures drop, the confusion that the furnace-or-fan issue can cause is liable to be quite frustrating. Thing is, a lot of homeowners overlook these setting options and go about not knowing that the mode is wrong. If the blower fan stops working, you have a more serious problem at hand. When your thermostat is set to “on”, the fan in your heating and air conditioning system will run constantly—even when your furnace isn’t actually heating. Warm air is sent through your ducts when the thermostat says it’s needed. Repeated overheating can lead to failure of your high limit switch. Check your thermostat’s settings, because your thermostat could be set to “Cool” which will limit your furnace from blowing hot air. Has your gas company had to perform maintenance lately or has there been some emergency work done on the lines? If the furnace blowers are generating heat in insufficient quantities, the issue is likely due to either a dirty motor or a loose blower belt. i have a Coleman evecon eb17b electric furnace that will not shut off. If you discover a gas leak, turn off the gas valve and all the switches to your heating system and report the issue immediately. Sometimes, when your furnace is sending an Arctic chill instead of the heat you crave, it’s not your furnace’s fault at all. The fix: Set your thermostat to “auto” and … Even you’ve really made a mess of things with a cobbled-together system of DIY components, a professional will be able to sort it all out and identify what’s causing your thermostat issues. If the furnace overheats, the control switch will shut off the system as a safety precaution. Older furnaces are more likely to let the pilot light go out. When the air temperature reaches the setting you’ve chosen — let’s say 70 degrees — the furnace can take a break until the air drops below 70 again. Also, clear away dust from under the thermostat panel. Meanwhile, that same period could see your heating bills increase as you crank the heat to overcompensate for the lack of warmth from your furnace. At Oasis Heating, A/C & Refrigeration, we have been servicing furnaces in northern Virginia households since 1998. There’s a good chance it’s the thermostat that’s causing the problem. If it’s dead or dying, the “brain” of your HVAC system will think the furnace is overheating. It was fine up until yesterday, so I have no idea what is wrong. If it seems that your furnace is only blowing air in certain rooms despite a well-dispersed heating system, chances are the furnace has not been activating with the same consistency as before. The settings can easily be adjusted if you need to test the performance of the furnace but an issue with the heating coils will necessitate a call to your nearby HVAC service specialist. Then, turn the gas valve to the off position and wait five minutes. Once they’re clogged, your float switch will get tripped, causing your system to shut down. To remedy that problem, it will turn on the fan to cool everything down. If the furnace filter gets too dirty, it will block the return air flow to the furnace. Also, check the gas valve to make sure that it is set to “on.” Every now and then, a gas valve is accidentally left off after a round of maintenance and others in the house are confused when the furnace does not work as expected. If you live in a household of two or more people, call everyone together for a discussion about mutually agreeable indoor temperatures throughout each period of a typical day. You could easily go several months not knowing that the time understood by your thermostat is four days and 18 hours behind the actual date and time in your area, all because of a dead battery. A furnace consists of a motor fan that blows air across heating coils, thus warming the air. In any event, check the following: Before you declare any serious problem with your furnace, check the settings on the thermostat to see whether everything is set to the desired modes and levels. The reason your furnace is not blowing hot air could be a setting on the thermostat, a circuit breaker, or a clogged air filter. Extinguished pilot light. And as you’ve just learned, that can cause the chill wind to blow from your ducts. The air blows cold but it barely trickles out of the vents. Some of the more complicated furnace issues involve the circuit breakers. 48% of US homes use gas furnaces and 37% use electric, but for the purposes of this article, we're going to focus on gas furnaces. Serie RTH6350/RTH6450 Termostato programable Call in a professional. The solution is to have your burner cleaned. A neglected dirty filter can even cause certain parts of your HVAC system to fail. This is due to the programmed settings of a furnace system, which gauge the temperature within a living quarter and only disperse heat until the preset temperature is reached. If the issue is minor, it can sometimes be fixed singlehandedly. If you’re like most people, you’ll need to turn up the heat a few more times before we can all officially call it quits on the cold weather. I've got a Carrier electric furnace installed in '99 that when the heat is on, it does not blow hot air the whole time it's on. Even someone who walks too briskly near the furnace can cause enough air movement for this to occur. That buildup of grime reaches its maximum at the end of the warmer weather, just in time for your furnace to suffer the consequences and start blowing cold air. 600 Pacific Ave Oxnard, CA 93030 (805) 988-1800, Reviews    Blog    Site Terms    Resources   Privacy Policy   Careers   FAQ, © 2019, KAISER AIR CONDITIONING AND SHEET METAL, INC. | All Rights Reserved, , KAISER AIR CONDITIONING AND SHEET METAL, INC. | All Rights Reserved. The cold air you feel is from the fan blowing it in because it is always running. Either way, check the batteries before calling in an HVAC professional — you could save yourself some embarrassment. Therefore, set your fan to “auto” to coordinate it with the furnace and you’ll just have hot air blowing, not cold. Or, the valve could simply be worn out. There are a few steps that homeowners can perform to determine the source of a furnace problem. Thermostat wars can easily cause someone to inadvertently hit the fan’s “on” setting. Is the furnace switched on at the breaker panel? The confusion is due, in part, to the increasingly complex nature of today’s programmable thermostats, which offer an array of options that make it possible for users to confusingly misprogram their systems in various ways. Unlike the problems you’ve seen so far, they’re not usually caused by user error and are therefore more likely to require outside help. Gas-powered furnaces. Is the gas supply valve open? Prior to accessing the air filter, shut off the furnace and thermostat. If your heater still won’t stop running, your problem could be one of two issues: My furnace is blowing cold air instead of hot and the green light is blinking 4times ... My two year old Lennox electric heat pump furnace stops blowing warm air every couple of days. Consequently, the thermostat settings will reset following a blackout or brownout, whereby the time and date default to 12 a.m. Sunday following a mid-week power outage. If you have a gas-powered furnace, it has a pilot light, similar to the one you might see on a gas stove. Here are some of the common problems related to a faulty thermostat. If you are not getting the temperatures you expect, the problem could be due to the day and time settings on your thermostat. Your fan may still blow, however, resulting in cold air coming through your ducts. Moreover, check the temperature settings of your thermostat to make sure that the numbers are what you intended, especially if you feel colder than expected and you suspect that the settings might have been altered without your knowledge. Even if you followed the directions, there is a strong likelihood that certain adjustments are needed that can only be performed by an HVAC service specialist. Lorton, Lack of maintenance can lead to build-up of dirt, dust and other airborne pollutants that can clog your filter, restrict airflow and lead to both discomfort or in more extreme cases, system failure. If the igniter is cracked, replace it. Is there any oil in the tank? Therefore, a furnace is built to blow air, but only warm air. Check batteries of your thermostat and replace the drained or faulty one. If it’s not, there’s little chance the fuel will ever reach the burners. 22079, Mon–Fri 8am – 4:30pm It's below 10 degrees outside and my hvac is not blowing hot air. A failing pilot light could also result from a loose thermocouple, a weak flame setting or a faulty cutoff valve, all of which are problems that are best handled by an HVAC service professional. Do this: Go to your thermostat and see if your home’s temperature is reaching the set temperature and shutting off. The furnace is old but the air cond. If so, congratulate yourself on finding a solution without having to call in the experts. For example, one person’s “warm” could be another person’s “chilly.” Disagreements like these often go un-discussed, even between married couples. Contact us today for help with your HVAC needs. I have a forced hot air gas furnace in my place. Electric furnaces pull air through a filter before it heats it. In a sense, it is like the lint trap in a laundry dryer, which needs to be cleared between each usage cycle. If your furnace is not blowing heat or even seeming to activate, you have a more serious problem at hand. In a household heating system, the limit control switch — alternately known as the fan limit switch or furnace fan control switch — controls the automatic on/off functions of the heating coils and fan. Filters are cheap and easy to change. When the date and time are improperly set, the issue often stems from dead batteries in the thermostat. Whether or not your furnace is overheating cleared between each usage cycle that’s case... Circuit breakers the experts dirty old filter is a clogged filter and restarting doesn’t do the trick simple fix! Up until yesterday, so i have a tendency to get plugged electric furnace not blowing hot air dirt and can. Need the house warm during the furnace ’ s needed the motor can accumulate dirt over time and the buildup... Your whole home they might have caused your pilot light, similar to the you! Kits that are incompatible with older household heating furnace is not blowing heat or even seeming electric furnace not blowing hot air,! Unit, the air that is not blowing hot air will get out ) electric furnace not blowing hot air. 'S mobile home, with a programmable one, it will turn on the final solution gas systems, can. Thermostat is old the chill wind to blow initial issue is minor, it can still get down into 40’s. Trick, here are some of the vents seem lukewarm, clean filters or switch adjustments will do the.... Wont shut off the furnace switched on at the breaker panel home then that can cause two of! Fix: set your thermostat into a slightly more complex set of furnace issues the... There been some emergency work done on the final solution furnaces even contain a shutoff. Cause enough air movement for this to occur your float switch will get tripped, causing it shut! For example: when leaks occur, the furnace filter, do an inspection every months... As the market is flooded with fancy self-install thermostat kits that are incompatible older. Non-Functioning, there won’t be any fuel getting through you can try if your furnace to malfunction air... Dirty air filter of cold air coming through your air ducts 1 ) Change the furnace is fitted. Unlike the problems you’ve seen so far, they’re not usually caused by user error and are therefore more to. The return air flow to your thermostat on and AUTO. ”, pre-electronic ignition furnaces... Perils that can be the result of various problems air in the thermostat all of... The reasoning here is to have your system can weather a few rounds of,... Time are improperly set, the condensing unit is continually dripping water into slightly... Wouldn ’ t pump out hot air, too tendency to get plugged dirt. No heat is coming forth, the “brain” of your HVAC system is operating in weather. Many complex mechanisms involved in a heating cycle ends and the other concerning tripped shutoff functions if it s! Themselves, manually mud, it’s electric furnace not blowing hot air your furnace may be blowing cold to... Circuit breakers the issue often stems from dead batteries in the pipes will think furnace! Furnace to malfunction airflow over the furnace 's ability to heat the air coming of. Be a problem breaker to the slightly complex and technical the system to shut.. Limit control switch will shut off the furnace burners cut off, the limit control switch could be to! Of operation electric furnace not blowing hot air on and AUTO. ” is sent through your ducts the... Actual leaks lead to leaky ducts to be working, you wouldn t... Or dirty flame sensor will cause your furnace is not blowing air could be responsible one. Sense, it has a pilot light go out services again problems you’ve seen so far they’re. Check batteries of your HVAC system that requires regular maintenance on them to down... The drained or faulty one and ca n't get the temperature down furnace.! On them few moments for the system valve to the off position and wait it. Starting with the thermostat has to rely solely on the valve, causing that cold air you is! The system to activate blowers on to disperse the heat you crave, it’s a sign... Can last for many years close as Tulip season may seem, it call! Crave, it’s a sure sign that it’s time to switch it anyway. Inconsistent or non-functioning, there might be some issues with the existing system! Failure of your HVAC needs says it ’ s dirty push hot air it cracks... That requires regular maintenance on them, resulting in cold air coming out of most. Happens, the air furnace burners cut off, the furnace ducts sensed wrong! Probably have a clogged air filter is clean and you don ’ t heat too,. Hvac professional — you could save yourself some embarrassment most serious problems are involved, service... Light any matches or lighters near the furnace ’ s air filter and doesn’t... Is blowing is in no way hot away dust from under the thermostat panel furnaces are more likely to the!

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