If your furnace seems to be blowing cold air, it could be a problem with the ignition system. Do you see water pooling around the furnace? As always with these articles, I encourage you to do some troubleshooting before calling in your local furnace repairman because most furnace problems (about 80%) are relatively small issues that you could easily handle yourself with a little creative troubleshooting. Over the years, it is not uncommon for ductwork to come loose or for seals to open up. This report will tell you exactly Once you’ve restored the correct setting, your furnace should blow warm air. Maintenance issues again here: if you have a gas furnace that hasn’t been cleaned in a long time, a faulty valve could be the reason for the cold air blowing out of your furnace. Common causes of condensate blockage are: Besides blockages, the condensate overflow may also be caused by a broken condensate pump. A furnace blower that won’t turn off will run up your energy bills and shorten the life of your furnace equipment (both expensive problems). This is not the case because your furnace is continuously running to reach your requested temperature, but it’s having some trouble. If your thermostat is properly wired, then your thermostat might just be broken. But if your furnace fan won’t stop running, two problems you might have with your furnace fan limit switch include: Thermostats are relatively cheap, and can range from $50 – $250. how much the units will cost, and the Why not give Coolray a call? If you need to replace your thermostat, I’d recommend you read our Nest vs Honeywell Lyric Review first. 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. This switch keeps track of how hot the burners are. If it is hot, then this is not your problem so move on. Safeguards are in place that shut off the burners when the unit gets too hot. This suggests that you have a switch that can’t sense heat properly and could be forcing the furnace to stay on, even when you don’t want stuff fanning around. This, however, is rare and if your are replacing your furnace’s filters regularly and using big quality filters, regular duct cleaning is not necessary. Furnace filters should be checked frequently for dirt and debris. Does your furnace blow hot air sometimes, but cold air other times? In this article, we will show you how to troubleshoot a situation in which your furnace won’t turn off, working our way from the most to least likely causes. Be an Insider, and Get Your HVAC-Facts Report Before You Talk to a Contractor. How to Fix Your Iced Up Air Conditioner, What Size Central Air Conditioner Do I Need for My House? Switch your thermostat to “auto” mode and it should go back to kicking on and off normally. © 2020 Coolray Heating & Air Conditioning all rights reserved. what sized unit you will need, which brands consumers prefer, fair rate you should spend for the total project. In electric heaters, this collection of dust can actually feed mold and mildew over time, causing something known as Dirty Sock Syndrome. If air doesn’t reach the burner and then open the flue that releases the heat, the flame rollout switch will shut the furnace down, so it doesn’t get too hot and catch fire. Make sure you consult a specialist first, but before you do anything, you’ll want to know some important information that can keep you from being ripped-off. Do you have an older furnace with a standing pilot light? So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. My Heat Pump is Blowing Cold Air in “Heat” Mode! Source. Check to see if it is your blower motor that is running continuously, or your whole furnace. If it is cool, however, then your next step should be to check your thermostat. And if you need help ASAP, we can help since we offer emergency service 24/7. Naval Aviator 2005-2015. If your furnace has a fan control, it may be adjustable. If your furnace won’t turn off even after the requested temperature for your house has been reached, then go to section 2 below. The pilot light is another common culprit of gas furnace problems. Your furnace filter may be located here, next to the blower. There is a reason for this – it works! Furnace not working. Your furnace’s limit switch, which specifically works as a safety measure, has turned your furnace burners off until the unit reaches a safe temperature. Step 4: Turn the knob to "pilot" and press down the knob The fan setting on your thermostat has two options, “on” and “auto”. Your furnace may be blowing cold air because the filter is too dirty. Check the entire length of your ductwork while your furnace is running. call a technician to help you reset the furnace, you’ll need a professional the fix the pump, unclog the condensate line by following this tutorial on Energy Vanguard. So if your furnace blower won’t turn off and you want to fix it, check first for: A thermostat that’s set incorrectly A fan limit switch that’s in its “continuous on” mode You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. specialist who may utilize auto-dial technology to contact you, even if the number you provided is on a do If this happens during a heating cycle, your fan might continue to run even though the burners are shut off, which can cause your furnace to blow cold air. furnace won't shut off (heater, gas, electric, repair) - House -remodeling, decorating, construction, energy use, kitchen, bathroom, bedroom, building, rooms - City-Data Forum Furnace Blower Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off.My furnace seems to be heating okay it is just the blower will not shut off. Hello, I have a Heil 900 gas furnace model # XXXXX About 2 weeks ago it was only blowing cold air. Reduces volume of hot air blown out – Blocked return air means the furnace has less to blow out your supply vents, leaving you chilly. 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. 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. If your furnace won’t turn off even after your house is at or above your programmed temperature, then the problem is usually more complex. Step 6: Turn the knob to “on” What’s the problem? This means that when the furnace is on, only cold air will come out through the vents. All that is required is a little patience. In that case, you’ll need a professional the fix the pump. To do this, just feel the air that is coming out of your registers (air vents). However, the fan will keep running, cooling the furnace to protect it from potential damage. If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. Step 7: Turn the furnace on at the thermostat If the temperature in your house is higher than the temperature you have set, then your furnace is not getting the information that it’s temperature goal has been reached, or the controls that turn this part of your furnace off are broken. Do this: Try relighting the pilot light following these steps: Step 1: Turn off your furnace In this section, we will address why your furnace won’t turn off and what you can do to help it reach it’s programmed temperature. Sure, but you get the idea. Your consent is not a condition to purchase any product or service. Change the air filter. Step 5: As you press the knob, hold a lighter to the pilot opening until the flame lights Well, it could be multiple issues; some of them you can solve yourself. It is important to note, that there are a variety of reasons that your furnace won’t turn off, many of which are outside of your control. The way that your furnace works is really quite simple – your heat exchanger heats up, and your blower motor circulates household air over it to heat the air in your house. Would you like to see the best local offers and seasonal specials in the Century area? One of the most common causes of a furnace blowing cold air is not actually a repair at all. Here is an article on how to choose a reputable contractor for your area: How to Choose an HVAC Contractor. A furnace blowing cold air is indicative of a problem. Some are within your control, and some are not. For more on this, try: should I have my air ducts cleaned? The assembly and switch should be near the bottom of your furnace. We've got you covered! If the wires are all in place, you might want to dig out your thermostat’s manual and ensure that it is wired correctly. Get up-to-date current news, promotions and industry tips. My Heat Pump is Blowing Cold Air in “Heat” Mode! Check that it is in the “auto” or “on” mode of operation. If your gas furnace is blowing cold air and won't shut off, it could be related to a blown pilot light. If the pilot light goes out, the thermocouple will shut off the gas to your furnace’s burners. Furnace shuts down – Because your furnace has to run longer to heat your home, the heat exchanger overheats, causing the furnace to automatically shut down. Now you’re re-starting the flow of gas to the pilot. The blower keeps blowing to cool the furnace down to a safe level. Simply answer a few additional questions about your home and Let’s take a look at the most common causes for a furnace that won’t shut off: If you’ve read some of my other articles, you’ll know that I am a huge fan of checking the simplest problems first. So before calling a professional for help, try these 4 furnace troubleshooting tactics. Have an expert inspect your ducts along with the furnace. A dirty furnace filter can limit the airflow through your furnace and cause it to overheat, which will shut it off automatically. If you have set your thermostat for 95 degrees in the middle of a Bozeman, Montana blizzard, then your furnace won’t turn off because it is trying to reach an unrealistic expectation. If the ducts can be directed, make sure they point away from the thermostat. In the heating season, just set the thermostat (s) to the lowest setting and confirm that room temperature is above that point. 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