There are many issues that can cause your heater to blow cold air. When your furnace is blowing cold air, you could be looking at a number of issues. Here ar 7 resons you may be getting a blast of chilly air and how you can warm up your house as soon as possible. Funny as it may sound, a system set to “on” will not necessarily blow warm air. I have a York Diamond 90 furnace up in my crawl space. The blower keeps blowing to cool the furnace down to a safe level. There is nothing more disheartening than to discover my own heat furnace blowing cold air in the middle of the winter months. I took the liberty of opening the panel on the furnace and turning it off and back on again to see if that would help -- no luck. Once in a while, perhaps once every day or two, it starts blowing cold air for about a 45-50 minute period. Typically it is best to have an expert come take a look however, below are some common issues that can result in your furnace blowing out cold air. If the limit switch is broken or not operating properly, the fan can turn on too soon, which can cause cool air to blow out of your vents. Most often this air will feel cold when the fan is “on” but if you don’t notice a change in your overall home’s temperature most likely this is just blowing out room temperature air. Viewed 3k times 0. It can be simple thermostat issues for one. My brother's furnace started blowing cold air one on of the coldest days of the winter. 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. (2020). Woke up one moring and it was blowing cold air. The fuel system, the burners, the fan and the ductwork. Why Is My Furnace Blowing Cold Air Sometimes? The cause behind a gas furnace blowing cold air can be simple or more complex. Check the Pilot Light. 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. Some simple HVAC system issues easy to troubleshoot include: Gas furnace fan settings. What I'm dealing with: My controller is a White-Rodgers (model 50A50-298). After you check your thermostat, it’s time to check your air filter. Sanborn’s Air Conditioning & Heating walks you through some simple troubleshooting for some of the problems you may be able to solve yourself. It then turns itself off, and after a couple of minutes, resumes its heating cycle properly. A furnace blowing cold air is indicative of a problem. Many new furnaces are much more efficient and have different methods of lighting your furnace. 7. The fan setting on your thermostat has two options, “on” and “auto”. So Why Is My Furnace Blowing Cold Air Instead Of Heat? Check to make sure your gas supply is turned in the on position (parallel/in line with the gas supply pipe. This guide will tell you what you need to know if that happens. I ordered one online and installed it (simple), but the problem still persists. While it's blowing cold air, the thermostat calls for heat, but the furnace will not respond, even if I put the temperature way up. The house stays at a constant 72 degrees (what it's set at), but I'm afraid that the unit may be in need of repair or replacement, or that it might be using more energy than necessary. 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. Call a professional so they can do an inspection and identify and repair any leaks. Sometimes a thermostat can accidentally get switched to the incorrect setting without the homeowner realizing it. The clogs may block the filters, prevent the entrance of cold air into the furnace, and cause the overheating problem. This is a common issue amongst older furnaces. Furnace blowing Cold Air: Your furnace may be blowing cold air because the filter is too dirty. Pilot Light. Sadly, this cannot be solved on its own. Your furnace may be blowing cold air because the filter is too dirty. Closed vents prevent warm air supply to your house and block cold air from getting in. Ask Question Asked 6 years, 5 months ago. 11. A dirty air filter is a common culprit of furnaces blowing cold air. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. A dirty air filter can sometimes cause the furnace to overheat. Furnace Blowing Cold Air Sometimes – What to Do. Or the furnace always blows cold air. The longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. If you are in need of a furnace repair you can trust our furnace experts here at JPS Furnace & Air Conditioning. If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional. 1. The pilot light is a small gas-flame inside the furnace that ignites the fuel. Change the air filter. If your blower though comes on by sensing heat, it might take up to about 1 1/2 minutes to come on AFTER the burner fire comes on. Tags: Calgary, Chestermere, Airdrie, Cochrane, © 2018 JPS Furnace & Air Conditioning, SiteMap. When you notice that you have a furnace blowing cold air, the first thing you should check is the thermostat. Your System Was Just Turned On. Sometimes the light just blows out, but it could also be a sign of another problem. Fortunately, they are pretty inexpensive and easy to change. Compromised flame sensor. If this is the case, we may have solved your problem. Related: Heat Pump vs. Air Conditioner and Gas Furnace, Which is Better? With electronic ignition systems, cold air could be caused by an electrical issue or if parts need to be adjusted or replaced. If you have a dirty filter, replacing the filter typically stops cold air from blowing. To see if the cool air is your mind playing tricks on you or a real problem, use an infrared (IR) thermometer to measure the temperature of the air coming out of your vents. Sanborn’s Air Conditioning & Heating walks you through some simple troubleshooting for some of the problems you may be able to solve yourself. Cold air trapped inside will need to be expelled before the hot air can take its place! It’s important to have a professional do cleaning and maintenance on your furnace annually, to ensure that the problems you may come to face are minimal. If the thermostat isn’t responsive, call a professional. Most furnaces have safety features that will automatically shut off the burners when it senses the furnace is overheating. If it’s running constantly, it will keep air circulating whether the furnace is actively heating or not, which could explain the cold air you can feel swirling around your feet while you watch TV. I've done the same thing at the breaker, but the thermostat is usually closer at hand. 11 – No Fuel for 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’re not comfortable with that or run into problems, call a Phoenix furnace repair company. A dirty air filter hinder air movement through the furnace. Your furnace may be blowing cold air … Woke up one moring and it was blowing cold air. Check if your thermostat is set to ON instead of AUTO. 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