Ensure that your thermostat is set higher than the temperature in your home. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Alternatively, you can call your local utility company or an HVAC technician to make sure it is lit safely. If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. What does children mean in “Familiarity breeds contempt - and children.“? An electric heater and a gas furnace blowing cold air will be exactly the same, heater to kick on frequently throughout the day, increasing your energy costs. On home units once they start failing they need to be replaced. However, many furnaces have newer and more efficient ways of lighting. rev 2021.1.18.38333, The best answers are voted up and rise to the top, Home Improvement Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. However, there are often some pretty common problems that furnaces have, as well as simple ways to fix them on your own. Sometimes ducts may leak, causing air from colder places, like your basement or attic, to get into your vents. This could simply be fixed by having the system professionally cleaned. The fan setting on your thermostat has two options, “on” and “auto”. Sometimes all you need to do to fix this problem is just to reset the system! This will then cause your furnace to start heating up while the fan starts to circulate the hot air. Mon – Fri. 8:00 am – 5:00 pm Sat – Sun. What has Mordenkainen done to maintain the balance? Heat pump systems operate pretty differently than standard furnace systems. Dirty air filters and other … One way to fix this issue is by turning your setting to “auto.” In this case, the furnace fan will turn on automatically when your home’s thermostat recognizes that the house is at a different temperature than what it’s been set to. Why Is My Furnace Blowing Cold Air Sometimes? A flame sensor that is covered in grime or debris, or is simply worn out, can cause the burner to continually be shutting off. If your furnace is blowing cold air, not blowing any air at all, or making odd noises, it’s important to schedule a repair as soon as possible. Home Heater Blowing Cold Air? 2) Furnace overheated Let’s say your furnace blows hot air, then cold air, but then stops blowing any air at all after a while. The “on” setting means that the furnace fan will be running even when the furnace itself is off. Why do jet engine igniters require huge voltages? This can contribute to cooler air flowing from your vents and through your heating system. Why does my furnace have different startup sounds after maintenance? Maybe the sensor that turns the fan off is not working and allows the fan to continue blowing too long. The heating elements are turned on with a heavy duty relay called a contactor. Furnace not working. Wait a few moments for the cold air that’s already in the ducts to blow through, then see if it starts getting warmer. This can be a little bit confusing, so let’s clarify it carefully. This air might not always be cold, and could be room temperature as well. More cool air than warm. A clogged filter will cause your furnace to work harder to push hot air throughout your home and can increase the likelihood of a costly furnace repair. Is your furnace blowing cold air or not turning on? In relation to the previous issue about the pilot light, a lack of gas supply could be the reason for the pilot light to be out. Plumb-Tech technicians are ready to help you with your plumbing and heating needs. What’s the problem? If so, the limit switch, a furnace safety device, turned the furnace burners off. Otherwise your electric heater or gas furnace will not turn on. This can often get blocked by simple forms of debris, or larger issues like ice, causing your entire system to shut down. If the filters are caked with dust, then it's likely the culprit behind your heater's malfunction. The flame sensor on the furnace may need attention. It’s possible your furnace overheated. Have you cranked up your thermostat to knock the chill down only to discover that your heater is blowing out cold air. Your System Was Just Turned On. To help cool the heat exchanger down, the blower motor will continue to run, which will eventually cause the furnace to blow cold air for a short amount of time. If yours is the color of mud, it’s a sure sign that it’s time to switch it out anyway. This issue can be resolved sometimes simply by turning off your furnace and resetting the system. Compromised flame sensor. I've done the same thing at the breaker, but the thermostat is usually closer at hand. Why is “HADAT” the solution to the crossword clue "went after"? Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. This type of furnace simply creates a spark and this spark lights the burners, saving the pilot light from being on at all times. 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; Your furnace is overheating; Yeah, that’s a lot of possibilities. There are usually PVC pipes and, again, can sometimes get clogged or blocked. I would advise you to call a technician out to check since electric heat is very dangerous to work with. When a heating cycle begins and your air handler turns on, that cool air will blow out of your registers before warm air does. It’s important not to overlook this issue, as it can cause damage to your furnace’s heat exchanger, which can be a costly repair. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Has your furnace been blowing cold air and you just can’t figure out why? Just as a disclaimer, it can never hurt to get a professional to look at these sorts of issues, especially if you feel that you may put yourself at risk by trying to determine or solve the issue. The fan blows fine. Heating systems are generally easy to maintain. This raises temperatures inside the furnace, and the limit switch shuts heating cycles down if the unit becomes too hot. How to make sure that a conference is not a scam when you are invited as a speaker? An electric ignitor does not require any pilot light and acts very similar to a gas stovetop. Sometimes, a pilot light might go out simply because of a strong gust of air. Thanks for contributing an answer to Home Improvement Stack Exchange! Is AC equivalent over ZF to 'every fibration can be equipped with a cleavage'? Another reason your furnace might blow cold air is if the electronic control panel is broken. Turning on and off can help reseat the contacts. Overheating almost always occurs due to restricted airflow as a result of a dirty filter. It might be best to wait a few minutes and then try turning it on again. Should I hold back some ideas for after my PhD? Your Furnace Air Filter is Dirty This means that your electric heat strips are not coming on. Filters are cheap and easy to change. What I'm dealing with: My controller is a White-Rodgers (model 50A50-298). Check Furnace Air Filter. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. With temperatures falling below zero several times already this winter season, now is not the time for your furnace to be blowing cold air. Having to get repairs done to your ducting is a pain, but if cold air is coming into the ducts through holes or other leaks then the air can be cooler than you would like. This will then cause the system to overheat, causing much larger issues. 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