How to Troubleshoot a Furnace Blower That Runs No Heat. If your furnace does not seem to be working, the limit control switch could be responsible in one of two ways. “Great timely service. If you discover a gas leak, turn off the gas valve and all the switches to your heating system and report the issue immediately. If your furnace fan is set to ON, the fan runs continuously, whether or not your furnace is producing heat. They’ll help you assess the right type and the correct size heater for your home. 1. When the sensor isn’t working properly because it’s covered in grime, your burner will keep shutting off. 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. 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. The function of the blower fan is to blow air across the furnace’s heating coils and disperse that warmth through the air ducts. Is the furnace switched on at the breaker panel? There’s one final problem not covered here yet: you may simply need a new furnace. Before you try this step, turn off the furnace and shut off the circuit breaker. Is there any oil in the tank? 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. Some of the more complicated furnace issues involve the circuit breakers. Another component of your HVAC system that requires regular maintenance is the condensate. It is entirely possible for the furnace to be burning away, producing hot air, without enough of that warm air … If there is a reset button on your furnace, turn the valve to the pilot position and hold a flame to the dedicated pilot gas tube while pushing the button for about 30 seconds. i have a Coleman evecon eb17b electric furnace that will not shut off. In a sense, it is like the lint trap in a laundry dryer, which needs to be cleared between each usage cycle. Check your thermostat’s settings, because your thermostat could be set to “Cool” which will limit your furnace from blowing hot air. Regular maintenance…. Furnace Not Blowing Hot Air? Filters are cheap and easy to change. 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. Gas-powered furnaces. Is the gas supply valve open? To test the quality of the heat itself, raise the thermostat temperature by five degrees and wait for the system to activate. If the igniter is cracked, replace it. We hope that you stay safe and healthy during this time. Electric furnaces are reliable, require fewer repairs than natural gas systems, and can last for many years. 5. Check that your air filter is clean and you don’t have a clogged air filter. Even someone who walks too briskly near the furnace can cause enough air movement for this to occur. Given the possibility that someone else in your household might have changed the thermostat setting, check to make sure that the thermostat is set to “heat” instead of “cool.”. With so many complex mechanisms involved in a heating system, any given number of issues could cause the furnace to malfunction. Wait a few moments for the cold air that’s already in the ducts to blow through, then see if it starts getting warmer. 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. In some cases, a thermostat will dump its settings when the battery runs low. If the coils are faulty, no thermostat settings, clean filters or switch adjustments will do the trick. An electric furnace that is not blowing air could be the result of various problems. 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. Lack of power or a confusion in the mechanics is your problem here. If so, they might have caused your pilot light to go out. To fix this issue is simple, just flip the fan switch from “ ON ” to “ AUTO .”. A furnace blowing cold air is indicative of a problem. I have a late 1980's mobile home, with a Coleman Electric Furnace. This can make the air coming out of the vents seem lukewarm. And if you think you might need to call in some help, we’re always here when you need us! This, in turn, could limit the ability of your furnace to produce and distribute warm air throughout your home. When it’s clogged, there won’t be any fuel getting through. When I turn up the thermostat, it does call for heat, but the air that is blowing is in no way hot. In the latter scenario, you probably have a damaged limit control switch. A neglected dirty filter can even cause certain parts of your HVAC system to fail. Either way, check the batteries before calling in an HVAC professional — you could save yourself some embarrassment. Thermostat is Set Too Low – Make sure the thermostat is set to a higher temperature than your home, and running on “heat” mode. 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. Do you feel warm blowing air? Beyond any possible issues with the blower fan, the most serious problems with a furnace are those that stem from the heating coils. On the upside, your blower motor is working just fine, though the heating-coil problem will require maintenance from a professional HVAC service specialist. 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. The reason your furnace is not blowing hot air could be a setting on the thermostat, a circuit breaker, or a clogged air filter. Pilot lights are used on older, pre-electronic ignition gas furnaces. 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. 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. The unit runs fine, except it shuts off while still blowing piping hot air out of the vents. Lorton, They’re often placed outside the heated area of our home, meaning they are exposed to extreme temperature changes all year ’round. For example, if the circuit breaker to the furnace is off, the furnace will not generate heat. |, 7220 Telegraph Square Dr Suite V, If your electric furnace is not blowing hot air, there might be some issues with the thermostat. If the pilot light fails to remain lit, the problem might stem from a clogged orifice, which can be poked clear with a small piece of wire. Here are some of the common problems related to a faulty thermostat. Serie RTH6350/RTH6450 Termostato programable Not realizing your high limit switch is dead (or even that such a part exists), you’ll be scratching your head on this one. Try changing the air filter and restarting the furnace. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Consequently, the thermostat thinks that you are at work instead of home reading a book. It was fine up until yesterday, so I have no idea what is wrong. 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. Sometimes, when your furnace is sending an Arctic chill instead of the heat you crave, it’s not your furnace’s fault at all. Aside from simple remedies to minor furnace issues, the majority of problems involving a furnace are best handled by service professionals. 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. First, confirm that the light is out. Simply put, if the settings on your furnace system are not properly coordinated with the fan, the latter will blow irrespective of whether you need or want actual heat. 7 common reasons a heat pump blows cold air If the furnace overheats, the control switch will shut off the system as a safety precaution. If changing the filter and restarting doesn’t do the trick, here are some more possible solutions. If you constantly hear the sound of a blowing fan yet do not feel the level of warmth that you would expect from a furnace, you literally do have a case of 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. Furnace problems, from minor to severe, generally stem from one of … Time for a family conversation about compromise. 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 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. If you are not getting the temperatures you expect, the problem could be due to the day and time settings on your thermostat. I pull the access panel off while the blower is running and it is spinning freely but not … Why Is My Furnace Not Blowing Hot Air? So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. 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. 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. If the furnace still blows cold air, call in a professional. After all, you wouldn’t likely need the house warm during the afternoon of a typical workday. Thermostat Issues. Without battery power, the thermostat has to rely solely on the power supply of your house. 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. Replace or clean dirty or clogged filters. If your furnace is on but no heat is coming forth, the problem could stem from issues with your thermostat. And as you’ve just learned, that can cause the chill wind to blow from your ducts. 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. 1) Change the furnace’s air filter if it’s dirty. Good value.”, “Would absolutely use their services again. If your heater still won’t stop running, your problem could be one of two issues: 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. Motivated and handy homeowners who have the drive can learn how to do this themselves, manually. But in the meantime, try these fixes we’ve covered here, starting with the simple solutions that you can apply yourself. An old or dirty flame sensor will cause your furnace to blow cold air, too. HVAC companies have all kinds of specialized tools for clearing out slimy condensate lines. I have a forced hot air gas furnace in my place. Likewise, when the heating coils warm, the control switch kicks the blowers on to disperse the heat through your household air ducts. You can avoid expensive repairs by troubleshooting furnace problems before calling a professional. Is the furnace itself turned on? 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. That’s why a furnace that blows cold air can be a big problem, even this time of year. 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. The cooler air is what ends up blowing into your living areas. Those fluctuations are what can cause weak spots in your ducting, eventually leading to actual leaks. If the furnace isn’t blowing air with any degree of warmth — and the thermostat settings, circuit breakers and air filter have all been ruled out as possible causes — the problem could stem from the blower fan itself. Check the fan settings on your thermostat if they are set to “auto” instead of “on”. If the issue is minor, it can sometimes be fixed singlehandedly. If your furnace is not blowing heat or even seeming to activate, you have a more serious problem at hand. The electric furnace is one of the most common. If the igniter is not cracked, use a multimeter to test the igniter for continuity. 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. An issue of repeat tripping should be reported to an HVAC service person immediately. To save energy, the thermostat sets the temperature low. To remedy that problem, it will turn on the fan to cool everything down. The furnace is old but the air cond. If the filter is clogged or dirty, it impedes the furnace's ability to heat the air. Furnaces too big will cycle on and off. If it’s not, there’s little chance the fuel will ever reach the burners. When the date and time are improperly set, the issue often stems from dead batteries in the thermostat. 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. But as close as Tulip season may seem, it can still get down into the 40’s at night here in Ventura County. Here’s yet another HVAC component that’s vulnerable to dirt and grime-related problems: the furnace’s burner. 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. 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. Thermostat batteries last a long time, however, so you’re more likely to have this be a problem if your thermostat is old. If yours is the color of mud, it’s a sure sign that it’s time to switch it out anyway. 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. Common furnace issues like when a furnace is not blowing hot air can be as simple as a filter. 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. 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. 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. 24 Hour Emergency Service Available. This is another reason to have your system checked regularly. Repeated overheating can lead to failure of your high limit switch. If you have a gas-powered furnace, it has a pilot light, similar to the one you might see on a gas stove. Have you changed your air filter lately? 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. We perform furnace repairs and replacements on a variety of heating systems. Focus your initial troubleshooting here, since you have the greatest chance of fixing the problem yourself without having to call in a professional. Others will require outside help from an HVAC professional. 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. 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. Prior to accessing the air filter, shut off the furnace and thermostat. A clogged furnace air filter can cause two types of problems, one involving blocked airflow and the other concerning tripped shutoff functions. Furnace still not blowing hot air? Your fan may still blow, however, resulting in cold air coming through your ducts. Dirt and debris can collect on the valve, causing it to shut down. Actually, there are all sorts of perils that can lead to leaky ducts. Oil-powered furnaces. 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. All rights reserved. Perhaps the furnace ducts sensed the wrong ambient temperature within your house and deactivated prematurely? That water is removed via piping that eventually makes its way outside your home, where the water drains off. 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. Thing is, a lot of homeowners overlook these setting options and go about not knowing that the mode is wrong. For example, one person’s “warm” could be another person’s “chilly.” Disagreements like these often go un-discussed, even between married couples. The fan, however, may keep on rockin’, causing that cold air to blow. Homeowners with programmable thermostats often go about not knowing that the hour and day settings are way off. 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. As such, a furnace that is not blowing air through vents across your heating system is indeed problematic. A dirty old filter is a clogged filter and that can restrict the air flow to your HVAC system. The furnace runs until the preset maximum temperature — usually at an owner-programmed level, such as 70 degrees Fahrenheit — has permeated the household interior, at which point the furnace shuts off to save energy. Either way, you are liable to experience inconsistent indoor temperatures if a misreading of any kind occurs in your furnace system. If that’s the case, you’ll definitely want an expert to weigh in before you start acting on the final solution. 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