You can think of your blower motor as kind of like a big fan (actually, that’s exactly what it is). However, the fan will keep running, cooling the furnace to protect it from potential damage. Furnace not working. Step 6: Turn the knob to “on” A probe inside the switch monitors the temperature of the burner assembly to turn the fan on once the burners are hot and turns the fan off once the burners cool down (when the thermostat stops calling for heat). This video will show you where you should start with your furnace troubleshooting. #3 Pressure Switch. I have a Kelvinator G6RK072C12A gas furnace. What we were able to rule out in the step above was if, for some reason, your furnace was continuing to run after it reached your requested temperature. Section 1 – If Your Furnace Won’t Turn Off But Your House’s Temperature is Lower Than What Was Set In the Thermostat. A home furnace, heat pump, or heater blowing cold air isn’t necessarily a reason to panic. Can’t find them? So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. When high-efficiency furnaces run, they create water (condensate), which is emptied out a drain line. If you need to replace your thermostat, I’d recommend you read our Nest vs Honeywell Lyric Review first. If you suspect ice is the problem, then wrap the condensate line with heat tape and pipe insulation. Look, if you’ve tried all of these steps, and you still can’t repair it, then it just might be time. So before calling a professional for help, try these 4 furnace troubleshooting tactics. Like a gas water furnace, the pilot of a gas furnace can shut off for several reasons. While covering the easy problems, a furnace will blow cool air for a minute or two after it is first turned on, until the burners and ductwork are warmed up. Naval Aviator 2005-2015. Change the air filter. Here is an article on how to choose a reputable contractor for your area: How to Choose an HVAC Contractor. One of the most common causes of a furnace blowing cold air is not actually a repair at all. This can be frustrating, but take your time and you can figure it out. Your consent is not a condition to purchase any product or service. The fan setting controls the blower, the part that circulates air throughout your home, Setting it to ON means the blower will run 24/7—regardless of whether the furnace is heating the air or not, thus why you get cold air sometimes. Blower Will Not Shut Off. A representative from NextGen Air (BBB A+ rated) will be calling you shortly to confirm your appointment. Do this: Try relighting the pilot light following these steps: Step 1: Turn off your furnace Bad analogy? At All Systems Mechanical air conditioning and heating, we believe that the experience our clients have is every bit as important as the products they receive. This report will tell you exactly All Systems Mechanical services Santa Clarita and Greater Los Angeles down to San Diego. Here are still a few things that you can figure out yourself. furnace won't shut off (heater, gas, electric, repair) - House -remodeling, decorating, construction, energy use, kitchen, bathroom, bedroom, building, rooms - City-Data Forum Check to see if it is your blower motor that is running continuously, or your whole furnace. Help! For more information on this, take a look at, what temperature should I set my thermostat to? Now, your furnace should ignite. This is due to the programmed settings of a furnace system, which gauge the temperature within a living quarter and only disperse heat until the preset temperature is reached. Dirty furnace filters are one of the most common causes of furnace failure. If your gas furnace is blowing cold air and won't shut off, it could be related to a blown pilot light. For immediate assistance you may call (855) 715-4500. Then the furnace’s condensate line (usually a PVC pipe) may be blocked, which causes the furnace to shut down. 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. Funny as it may sound, a system set to “on” will not necessarily blow warm air. Furnace Won't Turn Off - Furnace Troubleshooting. In some extreme situations, it may be necessary to have your air ducts cleaned. 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. Do this: Assuming that ice isn’t the problem, unclog the condensate line by following this tutorial on Energy Vanguard. Common causes of this problem: Your thermostat fan setting is set to ON. Now you’re re-starting the flow of gas to the pilot. So if your furnace is blowing cold air upon starting up, this is nothing to be concerned about. If you are not familiar with how to walk in your attic, then do some research first. 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. #3 – The Furnace Has Overheated. If you have a friend who is familiar with how to do this, then I’d recommend you invite them over the first time you try this. Try replacing your furnace air filter and see if this improves air flow. If your furnace won’t turn off even after the requested temperature for your house has been reached, then go to section 2 below. Safeguards are in place that shut off the burners when the unit gets too hot. 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. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. This will shut down gas coming through the pilot. But if your furnace fan won’t stop running, two problems you might have with your furnace fan limit switch include: This means that when the furnace is on, only cold air will come out through the vents. If the pilot light isn’t lit, then the furnace’s burners won’t light, meaning no heat. Only walk on joists, the supporting cross beams of your roof. This will make leaks easier to see. Don’t freak out just yet though, because by reading this article I’d give you no less than a 50/50 shot that your furnace issue is something you can handle yourself. If you're in the market for a new AC or furnace, make sure that you get a fair price! Top 10 Heat Pump Brands of 2019 - Which is the Best Heat Pump Brand? HVAC Installation Cost 2019 - What's a Fair Price for a New Heating and Air Conditioning Installation? 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. If it’s dirty, change it. when the house needs to heat up, it blows hot air like it should, but instead of shutting down at the end of the heat help! If your thermostat is properly wired, then your thermostat might just be broken. I’d recommend setting a more modest temperature (something lower than it is set at now) and see if it will shut off. The answer to this is usually no, but it’s still worth a quick read. A furnace blowing cold air is indicative of a problem. Do you see water pooling around the furnace? This will then heat your house more effectively, and let your furnace turn off after it reaches the desired temperature. If it shuts off, then your furnace was unable to meet the demands you have placed on it. Either hot air from the duct is blowing on the thermostat, causing it to think the RV is warmer than it actually is, or cold air is blowing across the thermostat, resulting in a similar issue. Your thermostat’s fan setting may be set to ON. Dirt and debris can collect on the valve, causing it to shut down. 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. 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. This article is a little different and is less common than the other problems. Check to make sure that all of the wiring is attached to the receptacles on the back of your thermostat. Turn your thermostat from HEAT to OFF. My Heat Pump is Blowing Cold Air in “Heat” Mode! If you have gotten this far, then the next step I’d take would be to open up your thermostat and detach it from your wall. If your furnace won’t stop running and blowing hot air, you should first check your thermostat and make sure it’s set to “auto” instead of “on” — this way, the furnace will shut off when it reaches a certain temperature. Heat Pump Installation Cost 2019 - What's a Fair Price? A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Is your furnace blowing cold air or not turning on? We value your privacy. This is another reason to have your system checked regularly. Have more questions? what temperature should I set my thermostat to? Source. The blower keeps blowing to cool the furnace down to a safe level. Reduces volume of hot air blown out – Blocked return air means the furnace has less to blow out your supply vents, leaving you chilly. 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