Use care not to touch an HSI when troubleshooting or installing a new one. A furnace that frequently shuts off automatically may have other issues, such as a clogged air filter or blocked ducts that are causing the furnace to overheat. Here is a guide to show you how your furnace should be working and tips to … If your furnace ran out of fuel, or was simply low on fuel, this could be your problem. During cold weather, you want to be sure that your furnace is blowing plenty of hot air. Go to your thermostat and take a look at the fan setting. So if you feel the air blowing out of the vents while the furnace is off, the air will seem cool since it’ll be at about room temperature. If your pilot light did go out, try to relight it. If you own an electric furnace and it's blowing cold air there's a few things that could be causing the problem. If your gas supply is not turned off, then you probably have a severed line. That may be a quick and easy fix. Try changing the air filter and restarting the furnace. Many times the problem can be resolved by restoring the thermostat to it's factory default settings. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Have you changed your air filter lately? A flame sensor that’s covered with grime or worn out can cause the burner to keep shutting off. In such cases, if your fan is still running, it could cause the system to blow out cold air, instead. Fortunately, there are specific reasons why your furnace may not … If. If it stays lit, you should be back in business. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. But you might want to consider calling a professional HVAC service who has the knowledge, tools and experience to find and repair the problem. The thermocouple is a sensor that regulates ignition, and if it requires adjustment or replacement your furnace will blow cold air. Your furnace might be running just fine, but the air blowing out of your vents feels cold. As your oil or gas-powered furnace heats the air, condensation is created. But I was complaining a little on the inside. If the furnace burner itself is neglected, accumulated dust and grime can cause trouble igniting. Or the gas line isn’t supplying enough gas to your furnace. But when it stops blowing hot air and starts blowing cold air, you know you have to find a solution. In fact, the problem may be as simple as changing your filter! If you have an oil-fired furnace, you may be out of fuel. Solution 2: If the pilot refuses to light, ensure that gas is flowing into the furnace. Many of the causes of furnace problems can be prevented with regularly-scheduled cleaning and maintenance. If your fan is set to "on," your furnace will continue to blow cold air until the drain thaws. 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. If the pilot won’t light at all, you may have a faulty gas valve. 4. The pilot light is another common culprit of gas furnace problems. 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. Troubleshooting Furnaces Not Blowing Hot Air. If you don’t feel comfortable doing this, then contact a professional. Pilotless furnaces have been an energy-saving breakthrough for the home and commercial heating industries. 2. Regular maintenance can prevent HVAC problems like your furnace blowing cold air. When the fan is on, the furnace will continue to blow, regardless of whether or not the air is being heated. If you have an oil-fired furnace, its filter can become clogged with dirt and debris, just like an air filter on a gas-fired system. if the switch is on, then check to see if the pilot light is dirty. 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. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. If this is the case, you'll first want to turn the gas valve that supplies the pilot light off. Is your furnace not blowing hot air? Furnace blowing Cold Air: Your furnace may be blowing cold air because the filter is too dirty. Check your thermostat and make sure that it is set to “auto” rather than “on.” When set to “on”, the fan on your furnace will blow continually, even when the furnace isn’t actually heating the air. They are available in electric, gas and oil models. If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. Or, if your system has not been cleaned in a while, a valve could be stuck due to dirt and debris. Let’s look at some of the solutions to this common furnace problem. If you find that you go to bed comfortable and wake up freezing because instead of your heater delivering warm air, it's blowing cold, it might be because the condensate drain has frozen. Have your system professionally cleaned to take care of this problem. When the burners of your furnace are clogged, there won’t be enough fuel for your furnace to keep blowing out hot air. If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. The best thing to do is have an HVAC specialist route the condensate drain into your sewage drain. Solution 1: Relight the furnace pilot light. While in some cases, you’ll need a professional the fix the pump. Here are some possible reasons your furnace is blowing cold air: The furnace is overheating Relight it and wait for a few minutes. heater is not lighting the fuel, as a result of which it cannot heat your home, Ducane Furnace Reviews [Models and Prices]. Cold air trapped inside will need to be expelled before the hot air can take its place! Furnace Blowing Cold Air? Ductwork is often installed in areas such as attics, garages or crawl spaces where there isn't temperature control. This will eliminate the risk of freezing. if it is, clean it to allow gas to come through. If not, the compromised air flow can cause your furnace to overheat, shutting down the burner. Clean it to ensure proper gas flow. Consult your users manual for directions on restoring the settings for your specific unit. Another telltale sign is if your utility bills are higher than they should be based on use. Make sure the furnace’s gas valve switch is in the “on” position (parallel/in line with the gas supply pipe. With that said, even if you recently changed your filter you should check it again. Overheated furnace. Copyright 2020 Think Tank Home. 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. If those flames fail to ignite, the furnace needs to know to close the valves so you aren’t pouring natural gas into the furnace. Then, use a pipe cleaner or other small brush to remove any clogs within the supply tube. Solution. You can easily fix this problem by thawing the condensate, but you'll need to take long term measures to prevent the issue from happening again. 5. Also, if your oil burner isn't functioning correctly you should check for a clogged filter. There’s only one thing worse than a furnace not working, it’s a furnace blowing cold air. Leaky ductwork can cause serious issues for your heating system. If your gas furnace seems incapable of blowing hot air, the problem could be with the ignition system. When an oil furnace blows cold air the problem could be the result of one of the following reasons: It may seem silly, but you'd be surprised at how many people's furnace problems are simply a case of running out of oil. How a furnace works is that a spark or flame ignites the gas that heats the coils in your unit.. Once its lit, if it doesn’t stay lit, it may need some routine maintenance from an HVAC professional. An HSI or Hot Surface Ignitor is the most popular way to ignite a pilotless furnace. Don’t freeze on days and nights you should be warm and cozy. Have you changed your air filter lately? I’m honestly not trying to insult your intelligence, but you’d be shocked at how many times we’ve gotten a call to come out when a furnace won’t turn off, only to find out that it was really a cold-war between the wife who likes it at 80 degrees and the husband who likes it at 68. 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