Is your furnace not blowing hot air? Your System Was Just Turned On. Have You Been Changing Your Furnace Filter? Why Furnaces Blow Cold Air & What To Do Next. If the gas is on, but the pilot won't light or stay lit, the pilot tube or orifice may be dirty. 2. In addition, there are a few problems that are unique to pilotless furnaces which you'll want to look into if the troubleshooting tips above don't fix your problem. I’d watched the repair guy do his 10 minute job, and it didn’t look difficult at all. If you've recently had an electric power surge or any other power issue, the fix could be as simple as replacing a fuse or flipping the circuit breaker. The oil from your fingers can cause permanent damage to the part. The first thing you should check is the fuses or circuit breaker. Or, it may prevent the furnace from operating at all. If the flame stays on, great! All Rights Reserved. Go to your thermostat and take a look at the fan setting. 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. If your thermostat’s fan setting is set to ON, then your furnace blower will constantly be operating ever when it is not putting warm air into your home. Have your system cleaned and checked by an HVAC professional. During cold weather, you want to be sure that your furnace is blowing plenty of hot air. It generates heat through ductwork in the home by using a pilot light connected to a thermostat that homeowners can set to regulate the temperature in their homes. Pilotless furnaces have been an energy-saving breakthrough for the home and commercial heating industries. As an Amazon Associate we earn from qualifying purchases. 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. A furnace blowing cold air is indicative of a problem. That’s why the furnace is not blowing hot air. If not, the compromised air flow can cause your furnace to overheat, shutting down the burner. Copyright 2020 Think Tank Home. You’ll find the instructions on the unit itself or in the user’s manual provided. This results in your furnace not heating up the coils. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. But is your home staying warm, at the temperature you set it at? We strive to provide the best possible customer service experience for each of our customers. Have you installed a new thermostat lately? It’s possible your furnace overheated. A flame sensor that’s covered with grime or worn out can cause the burner to keep shutting off. Changing your filter is a good starting point, but if the problem persists we have other options for you to troubleshoot. if it is, clean it to allow gas to come through. Overheated furnace. But before you call for help, you might be able to do some simple troubleshooting and save yourself a little money by fixing it yourself. But you might want to consider calling a professional HVAC service who has the knowledge, tools and experience to find and repair the problem. If the furnace turns on but no heat comes out, it will be a cold night. Relight it and wait for a few minutes. If cleaning the pilot tube and ignition element doesn't solve the problem, and you continue to lose your pilot, the thermocouple may be defective. If this is the case, someone walking by the burner could generate enough of a draft to cause the pilot to go out. Have your system professionally cleaned to take care of this problem. There could be a few reasons why your furnace is chilling the room. But if it doesn't light, or it won't stay lit, you'll want to check that gas is flowing to the pilot. We will examine the most common issues that cause your furnace to blow lukewarm air, including: If so, the limit switch, a furnace safety device, turned the furnace burners off. This guide will tell you what you need to know if that happens. Consult an HVAC expert for advice. 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. 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. Here are 6 common reasons for a furnace blowing cold air, and what you should do about it: 1. When this is the case there's a good chance that the material will degrade and begin to leak. How to Troubleshoot a Furnace Blower That Runs No Heat. Then, use a pipe cleaner or other small brush to remove any clogs within the supply tube. 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