Change the setting back to AUTO, and you’ll have heat again. If this doesn't resolve your cold air problem it could be the themostat itself, but before calling a professional, we recommend trying the other troubleshooting suggestions first. But when it stops blowing hot air and starts blowing cold air, you know you have to find a solution. Try changing the batteries. During cold weather, you want to be sure that your furnace is blowing plenty of hot air. You do not want the blower to stop if the burners are still lit. Next, use fine-grit sandpaper to remove any oxidation from the tip of the pilot, and reattach the pilot tube to the furnace. Schedule service Troubleshooting tip #1: Check the thermostat If your furnace blows hot air sometimes and cool air at other times, … Copyright 2020 Think Tank Home. Even if your furnace is fairly new, things can go wrong that cause this unpleasant surprise. If the gas is on, but the pilot won't light or stay lit, the pilot tube or orifice may be dirty. The HSI features a cobalt element that's prone to cracking. AUTO ensures that the blower will run only when the furnace heats the air. Or, if your system has not been cleaned in a while, a valve could be stuck due to dirt and debris. Here in the New York City area, we’re all pretty tired of the cold weather by now. Count your blessings that this time you avoided an expensive furnace repair. Check to see if one of these troubleshooting tips fixes the issue. If your thermostat is set to "on" instead of "auto," it could be causing your furnace to blow cold air. As an Amazon Associate we earn from qualifying purchases. Have your system professionally cleaned to take care of this problem. An HSI or Hot Surface Ignitor is the most popular way to ignite a pilotless furnace. This usually arises if you haven’t changed your air filter routinely. 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. Salons & Spas: Improve Indoor Air Quality to Keep Customers Safe, COVID Prevention & Air Quality Technology Shown 99.9% Effective. Do you have thermostat wars going on in your office? Mechanic's Assistant: What is the make/model of your '16 RV? Also, if your oil burner isn't functioning correctly you should check for a clogged filter. If you choose to call a professional to do the job for you, this would be a good time to have your system inspected. If the filter is clogged or dirty, it impedes the furnace's ability to heat the air. Excessive heat or exposure to water can damage the circuit board, which can cause your furnace to lose some or all of its functionality. The reasoning here is simple: furnaces don’t pump out hot air nonstop. You’ll need a visit from an HVAC professional to make this furnace repair. 13 Common Causes. If you do manage to relight the pilot but it keeps going out, a faulty thermocouple is likely causing your furnace to blow cold air. More cool air … If you have a washable air filter (which I wouldn’t recommend), then ensure that … I checked the system monitor data. Heat Pump Troubleshooting: 3 Common Problems and Solutions, The Rewards of Giving Back: Arista Team Rebuilds a Home in Puerto Rico, Commercial Refrigeration Service & Repair. If you're lucky, the problem may be as simple as changing a fuse on the circuit board. This will eliminate the risk of freezing. To mitigate carbon monoxide and puff backs, an internal motor kicks on and creates a vacuum just before the burner engages. 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. Now your furnace will only blow warm air. Hi all, I think our thermostat/furnace isn't working properly. If everything seems to work properly, and then your furnace blows cold air back and forth until it switches off, you may be faced with a furnace that has overheated. The thermocouple is a sensor that regulates ignition, and if it requires adjustment or replacement your furnace will blow cold air. If the vacuum does not occur, the furnace will not ignite. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Try changing the air filter and restarting the furnace. My 2016 Winnebago view electric furnace is blowing cold air, what could be the problem? A furnace that blows cold air could also indicate that it is overheating. But for the most part the temperature control switches are non-adjustable and are to be replaced if found faulty. When this is the case there's a good chance that the material will degrade and begin to leak. There's a lot of issues that can cause your ducts to leak. Start by turning your heater off and inspecting the filters. The furnace will be more likely to pull in sediment from the tank, which can clog your air filter. Use care not to touch an HSI when troubleshooting or installing a new one. When the condensate drain freezes, it causes condensation to drip back into your system and trigger a shutdown. If it stays lit, you should be back in business. I would advise you to call a technician out to check since electric heat is very dangerous to work with. This means the fan will run continuously without providing heat. But if you’ve set your fan to be “on” at all times, it’ll blow cold air during the furnace downtime. 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. That may be a quick and easy fix. The “on” setting means that the furnace fan will be running even when the furnace itself is off. They are available in electric, gas and oil models. If you have a newer furnace with an electronic ignition, such as an intermittent pilot or a hot surface ignition, your system may need adjustments or replacement of failed parts. Clogged air filters could be causing cold air to blow out of your vents. Ductwork is often installed in areas such as attics, garages or crawl spaces where there isn't temperature control. Before calling for repairs, check your fuel level. After checking that your fuel level is adequate and your filter is clean, the next area to check is the flame sensor. If your furnace blowing lukewarm air, give us call at 580-699-5662. The condensation must be removed from the system and if your condensate drain terminates outside your home, it can freeze. If the switch is in the ON position, then the blower keeps running, even when the furnace is not heating. Seals breakdown, the constant pull of gravity, rodents, incorrect installation, and even age can play havoc when it comes to delivering hot air. The flame sensor itself is relatively easy to clean, but many homeowners are uncomforable working on their furnaces. 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. Try replacing your furnace air filter and see if this improves air flow. 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. But you need to know when to call in the furnace repair pros so you don’t have to spend unnecessary time in the cold and interrupt your business. Another telltale sign is if your utility bills are higher than they should be based on use. Do this: Ensure your thermostat’s fan setting is set to AUTO, not 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. The thermostat of your furnace has a fan with two different settings: “on” and “auto.”. If you have an oil-fired furnace, you may be out of fuel. As a pilotless burner owner, you'll want to keep your fingers crossed that your issue isn't related to your burner's circuitry. Have you installed a new thermostat lately? This is similar to rebooting your computer to fix a software glitch. As soon as the furnace cycles back on the air will warm up again. Learn more from our free guide: HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. This happened last night and this morning. If you did it yourself instead of calling a professional, you may have chosen a thermostat that’s not compatible with your heating system. The Pilot Light is Out Symptoms. Check your thermostat. If the filter becomes clogged, the unit can start to overheat and cause the burner to shut down. When this happens, … The engine is off, and I'm running the furnace while plug in electric. The oil from your fingers can cause permanent damage to the part. 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. 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. Failure of the transformer that provides power to the thermostat can also … But, of course, there are many other possible causes. This means that your electric heat strips are not coming on. Furnace Blowing Cold Air? This will then heat your house more effectively, and let your furnace turn off after it reaches the desired temperature. In some cases, a malfunctioning thermostat may require adjustment or replacement . The “on” option is exactly how it sounds. When the air temperature reaches the setting you’ve chosen — let’s say 70 degrees — the furnace can take a break until the air drops below 70 again. This could happen from a gust of air caused by someone working near the furnace. A friend of ours bought a new house recently. The fuel system, the burners, the fan and the ductwork. In other words; no vacuum means no ignition, which may be why you are experiencing cold air when you're expecting hot. When you get to your destination, you expect to walk into a toasty warm space. You also don’t want to risk frozen pipes. In most situations, it's best to enlist the help of a professional to fix this problem. Electric furnaces pull air through a filter before it heats it. Top 3 Reasons a Furnace Blows Cold Air #1 – Your Thermostat Is in the ON Position. Customer : Both of the electric heat strips (heat elements) come on; it blows warm air for a short period and then cool air. Have your system cleaned and checked by an HVAC professional. And since even a modest-size home has dozens of outlets, the heat loss is significant. Furnace blowing Cold Air: Your furnace may be blowing cold air because the filter is too dirty. Check the owner’s information for your furnace to see if there should be a blower delay after the burner kicks on. It restricts the airflow in and out of your furnace, which can cause this issue. Depending on the age of your system and its model, you may have to manually relight it yourself or you may only need to push a button. If you’ve had the thermostat for a while, the battery might be low. If the flame sensor is dirty, it will produce inaccurate readings which can cause heating issues. Check the Pilot Light. These are the most common reasons a furnace will blow lukewarm air. So 85-92°F feels cold to new heat pump owners. 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. To do this find the gas line and make sure that the gas valve is parallel with the pipe. Over time, the changing temperatures wear on all sorts of things and your ductwork is no exception. If you own a gas furnace, there are several potential things that can cause cold air to blow when you're expecting hot. The first thing you should check is the fuses or circuit breaker. Faulty Thermocouple. Unfortunately, more complex issues in this department typically require an expensive replacement. Use a wrench or pliers to remove the pilot tube. Ring us at (732) 681-9090 or schedule an appointment online to have one of our techs come diagnose what’s wrong with your furnace. 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