I have York furnace TG8S 80% AFUE that has been used for 5 years. When a heating cycle begins and your air handler turns on, that cool air will blow out of your registers before warm air does. Hi brilliant people, First, hope you are having a great holiday. Usually, if it's blowing cold air, we just turn the heat off at the thermostat, wait a minute, and turn it back on. Damaged heating elements of electric furnaces also cause your furnace to blow cold air. If your furnace fan intermittently blows cold air or stops blowing warm air all at once, check a few things before calling a professional. If your furnace is blowing cold air, or is not operating at all, a component called the fan limit switch may have malfunctioned. RV furnace troubleshooting may also be necessary when a spider has spun its web inside the furnace area. Unlike a furnace that puts out a lot of heat for short periods of time, a heat pump will put out less heat for longer periods of time. That’s common sense, right? If you know how and you’re comfortable doing it, you can try to relight the pilot yourself. Here ’s what you need to do in NC. If this is happening to you, it’s helpful to know why this could be occurring and what you can do to troubleshoot the problem so you aren’t left freezing in your Texas home. Many of the causes of furnace problems can be prevented with regularly-scheduled cleaning and maintenance. Furnaces can overheat for a variety of reasons, including: If the furnace burner itself is neglected, accumulated dust and grime can cause trouble igniting. The dirt and debris that have amassed might be restricting the valve to operate as it should. Salons & Spas: Improve Indoor Air Quality to Keep Customers Safe, COVID Prevention & Air Quality Technology Shown 99.9% Effective. Otherwise your electric heater or gas furnace will not turn on. My brother's furnace started blowing cold air one on of the coldest days of the winter. 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. and steps during the times of COVID-19. Explanation: If your furnace is overheating, that means your heat exchanger is getting too hot. Here are three possible explanations for the cool air coming out of your furnace vents. Fix a furnace blowing cold air intermittently. Some like it a little warmer; others like it a little cooler. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. No matter how you travel to work, whether it’s by bus, car or train, your commute probably ends with a cold walk in the icy wind. If the furnace in your Thomasville area property is only producing cold air when all you need is heat, then don't hesitate to call in the heating and cooling experts of All Comfort Control Heating and Cooling to assess the problem. If you have an older furnace with a continuous pilot light, the pilot may have gone out. And because your furnace is no longer heating, the air being pushed into your home will be cold. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. If you want help from us, you'll have to tell us the make and model of both the furnace and thermostat. But, it is still warmer than the indoor house temperature, so it is still putting heat into the house. OllieW Member Posts: 4. 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. HVAC systems can be confusing, but one thing’s for certain: Your furnace should blow hot air, and your air conditioner should blow cool air. That’s why the furnace is not blowing hot air. Funny as it may sound, a system set to “on” will not necessarily blow warm air. Is your furnace blowing cold air or not turning on? If you haven’t done that yet this winter, call in an HVAC service expert to keep your system in top shape and prevent unexpected failures. Sometimes, it works just like it's supposed to, but sometimes, there is no fire and all I get is fan. Furnace intermittently blows cold air. Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. The house was freezing, and my family was complaining, so I started phoning HVAC repair companies to schedule someone to fix it. Next Post This is What to Do When Your AC Unit Freezes Up. The blower motor itself does not create the heat; rather it blows the heated air created by the furnace through the system's ductwork. This means the fan will run continuously without providing heat. I've checked the ignitor, and it doesn't appear cracked. But because of the cold snap, all the furnace repair guys were slammed. 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