It’s always better to be safe than sorry, especially if you don’t feel comfortable fixing, or even checking for, issues regarding your central heating system. When the thermostat stops calling for heat, the furnace will turn the electric heating coils off, but allow the fan to continue blowing air until the coils cool down. Making statements based on opinion; back them up with references or personal experience. What's the make and model of the furnace? Do you sometimes notice that your furnace is only blowing cold air on occasion? Just like rebooting your computer, sometimes the system just needs a restart. Simply prevent this issue by making sure that your filter is changed regularly and stays fairly clean! If the filters are caked with dust, then it's likely the culprit behind your heater's malfunction. Sometimes all you need to do to fix this problem is just to reset the system! Should I hold back some ideas for after my PhD? 1. Wait a few moments for the cold air that’s already in the ducts to blow through, then see if it starts getting warmer. though several reasons can cause this problem, there are a few things you can do before you call a professional. It’s possible your furnace overheated. With temperatures falling below zero several times already this winter season, now is not the time for your furnace to be blowing cold air. Why does the pilot light go out when the furnace is running? If your thermostat is set to "on" instead of "auto," it could be causing your furnace to blow cold air. When it is chilly, having a heater that is not working is a major cause of concern. Where Do I Buy Dishwasher Salt in Missoula, Montana. Show activity on this post. When that happens, the furnace will blow cold air. If you’re comfortable doing so, just follow the manufacturer’s instructions for how to re-light it safely. This drain removes and drains water that is created in the heating process. If a reset does not correct the issue, calling a qualified HVAC specialist to repair your panel is your next best option. This is a safety feature that turns off the burners to prevent a fire in your home. The flame sensor on the furnace may need attention. A friend of ours bought a new house recently. On newer and more efficient furnaces, there are typically vent pipes that lead from the furnace to the outside of your home. Why is “HADAT” the solution to the crossword clue "went after"? site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. This could simply be a thermostat issue. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. Heating systems are generally easy to maintain. 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. Check the furnace’s air filter Your furnace may be blowing cold air because the filter is too dirty. Does your furnace start by blowing warm air, but then quickly turns cold? This can contribute to cooler air flowing from your vents and through your heating system. The heating elements are turned on with a heavy duty relay called a contactor. This will then cause your furnace to start heating up while the fan starts to circulate the hot air. This air might not always be cold, and could be room temperature as well. It will also depend on how much insulation you have around your ducts and how old your furnace … If the furnace still blows cold air, then you may need a professional to take a look. Finally, don’t hesitate to call in a professional! Are you confused about why your house isn’t as warm as you want it to be? We’d love to take the load off and help you as much as we can, so don’t hesitate to give us a call! Has your furnace been blowing cold air and you just can’t figure out why? A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. This defeats the purpose of having the furnace on. However, many furnaces have newer and more efficient ways of lighting. What I'm dealing with: My controller is a White-Rodgers (model 50A50-298). 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. If the issue is ongoing, for example, if ice or snow has a tendency to pile up where the pipes lead to the outside of your house, consider bringing in a professional to move this piping to a more convenient place. This can often get blocked by simple forms of debris, or larger issues like ice, causing your entire system to shut down. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Once changed, always check to make sure that your heater is blowing warm air only. Call us to learn more about our services or book an appointment. Have an expert inspect your ducts along with the furnace. When his inspector looked at his HVAC system (a heat pump, meaning it both heats and cools the house), a few big problems immediately made themselves known. If you notice your furnace only blows cold air on occasion but your home is still maintaining its temperature than this may be simply a setting on your thermostat. Obviously, the best way to solve this problem is to find the root cause and eliminate it. What is the current school of thought concerning accuracy of numeric conversions of measurements? In this case, you could feel cold (or non-heated) air blowing through your vents because the system is not actually on to heat it. 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. It sounds like the heating coil(s) are going bad. A flame sensor that is covered in grime or debris, or is simply worn out, can cause the burner to continually be shutting off. You should have it serviced by a qualified HVAC technician. One of the most common causes of a furnace blowing cold air is not actually a repair at all. With winter just around the corner, you do not want to be caught with a faulty furnace and a cold house. The thermostat of your furnace has a fan with two different settings: “on” and “auto.” The “on” setting means that the furnace fan will be running even when the furnace itself is off. 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