If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional. Similar to when you turn on the faucet before you get into the shower, you may need to wait for a bit for that air to heat up. bird's nests, etc. Your furnace is supposed to heat your home, so the last thing you’d expect is to feel cold air coming from your home’s air registers when your system is running. My furnace is blowing cold air and will not turn off even when the thermostat is turned off. For instance, if you set your thermostat to 100 degree when it’s below zero outside, your furnace will continue to run and struggle to hit that temperature. It tuens on blows for a minute then stops, but its cold air … If your gas furnace is older and it’s blowing cold air, chances are its pilot light has gone out. 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. It is very possible that your filters were dirty and/or restrictive, thus reducing air flow. Maybe the sensor that turns the fan off is not working and allows the fan to continue blowing too long. Your furnace has one job: blowing hot air. When the thermostat is on, it might set the air to the room temperature. I have my heater on and its only blowing air, not cold or hot. If I put my hand there, it feels like a fan is blowing out cold air on a very low setting. Or, there are some thermostats … At this point, the high limit switch will be tripped for safety reasons and the burners will be shut off. Your furnace clicks on and the blower motor is running, but the air coming from the vents is cold or cool instead of hot. High-Efficiency – Condensate Pump Not Functioning. A dirty air filter can interrupt the air flow over the heat exchanger and cause it to overheat. Close the service door and turn the furnace back on. The Pilot Light is Out Symptoms. Of the jayco rv. This will prevent the exhaust from escaping and cause your issue. Change the air filter. If, after a few minutes you still experience the furnace blowing cold air, you may need to contact your HVAC contractor. In order to check the fan to make sure it is working right, start by turning the furnace to the off position. But as it turns out, this is a furnace problem that comes up often in many Bay Area homes. Also make sure all of the supply vents are open and the return air grilles are all clear and … If you’re comfortable doing so, just follow the manufacturer’s instructions for how to re-light it safely. In such cases, a safety control device known as the limit switch will shut off the burners. Then locate and remove the service panel. Even though no fans are turned on it`s lightly blowing out warm air from that vent and I cant seem to stop it from doing that. The first thing you’ll want to do is make sure that you set your thermostat to an appropriate temperature. If you’ve just bumped up the temperature or if you’ve just turned your furnace on all together, it may just be as simple as your heater needs some time to warm up. Clogged air filters usually restrict the flow of heated air from the furnace and into your house. Alternatively, you can call your local utility company or an HVAC technician to make sure it is lit safely. Check the air filter. But seeing as I don't feel it on the other vents on the other side of the house (that are on the same zoning), it just seems counterintuitive. 1. The switch … If you just turned on the heat, hot air may not yet be flowing through your air ducts. Allow your system to run for 5-10 minutes to see if the air warms. Why Your Furnace is not Blowing Air. In this video I show you how I fixed my RV furnace. 5 Reasons Why Your Furnace Might Start Blowing Cold Air. A furnace isn’t a complex piece of home machinery. Pilot Light Is Out. It blows cold air for the first 10 minutes of each heating cycle. Check the owner’s information for your furnace to see if there should be a blower delay after the burner kicks on. I turned off the furnace and the breaker when I installed it. Today we’re going to talk about five reasons why your furnace might … Your condensate pump works to channel liquid through the condensate line and drain trap. This is a safety feature. To help cool the heat exchanger down, the blower motor will continue to run, which will eventually cause the furnace to blow cold air for a … It's definitely more than the typical draft you might feel coming from a poorly insulated window. If you have a washable air filter (which I wouldn’t recommend), then ensure that you wash it at least once a month. If it malfunctions due to mechanical failure, leakage may result. The Thermostat Fan Is Turned Incorrectly. Re: COLD air coming from heat vents when heat off … Mechanic's Assistant: Have you checked the coolant level? There are a few ways to do this depending on your thermostat, but the most common are: Turning the heat to off then changing the fan from auto to on. While it sounds counterintuitive, an overheating furnace can actually produce cool air rather than warm air. I’d recommend against using washable, electrostatic air filters and here’s why: For most, checking the thermostat to ensure the fan setting is correct will keep the cold air from blowing when it is not wanted. There is a vent on the wall just outside of that closet. Every forced hot air furnace has a furnace blower that makes air circulation possible for any house. Furnace is blowing cold air, then shuts off. When that happens, the fans will keep blowing while no air is being heated, which will blow cold air into your living space. The furnace fan plays an essential role in every hot air furnace system. Is your furnace blowing cold air and you are noticing the fan is always on? Your furnace may be blowing cold air because the filter is too dirty. I went to the furnace and - Answered by a verified HVAC Technician. Did your furnace fan stop blowing? Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. Is my furnace not working?? Conventional – … Your System Was Just Turned On . Just air, so I went to my thermostat to turn off the furnace but … Make sure your flue is open and not blocked or restricted by dead animals. Ok. My old thermostat was a digital one and the screen didnt work so I went to buy another just today. 3. The cold air you feel is from the fan blowing it … There should be an arrow on the filter showing the proper direction of air flow, which is facing the blower. Or maybe the air starts off hot, then turns cool before the furnace shuts down. In many cases, the solution is much simpler than you may realize. Details Turn the furnace off immediately to prevent water damage or an electrical hazard: ... You may also find your furnace blowing cold air. RV Furnace NOT Blowing Hot Air - No Ignition | Cuts Off. Another reason your furnace may be blowing cold air is because it has overheated. Do this: Turn off your furnace at the thermostat, and check the furnace filter. However, the fan will keep running, cooling the furnace to protect it from potential damage. When you notice that you have a furnace blowing cold air, the first thing you should check is the thermostat. If your furnace trips the breaker one or more times after it has been reset, leave the unit off and call Air Experts for repair. Furnace Fan Won't Quit Blowing. When your furnace won’t turn off, because it can’t reach your desired temperature. Be sure to change your air filter every month to improve indoor air quality and prevent furnace … Then heat starts to appear fine. Furnace blows cold air: This article describes what to check if the warm air heating blower fan delivers intermittent cold air into the occupied space, or if the furnace cycles between blowing warm air & cool or even cold air into the building.. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. I live on the bottom floor and my condo is constantly around 80 degrees … I have a 40 year old condo with a Lennox G8 furnace. I?ve had people say to me, ?My furnace blows cold air only! A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Your Fan Is … Most furnaces have safety features that will automatically shut off the burners when it senses the furnace is overheating. Checking the thermostat is where any technician will begin when trying to diagnose the problem. 2. First, turn off the furnace. Mechanic's Assistant: What is the make/model/year of your RV? Try replacing your furnace air filter and see if this improves air flow. If your furnace overheats, it could end up blowing cold air. Have you checked for a leak in the radiator? We use cookies to give you the best possible experience on our website. Turn off power to the furnace at its ON/OFF switch. Typically, it usually uses natural gas to heat air, then uses a blower to move the air through air ducts to different parts of the house. If your furnace is not doing that, what are you paying it for? Wait a few minutes, then flip the switch to ON. 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. A dirty air filter restricts airflow into your furnace. In most cases, when used in a forced-hot-air system, oil, wood, or natural gas are used to fire up the burner. Normally when a furnace won't operate unless the front cover is off it is because there is a lack of air flow. If this does not correct the problem, call for furnace repair. A furnace that utilizes forced-hot-air is made of the plenum, the furnace blower, and the burner. Air is then heated through the burner that was collected in the plenum. (Sometimes this happens for 30-60 minutes.) The furnace is in a small furnace closet in the hallway. The "blowing cold airs" periods eventually get shorter and shorter... as the "blowing hot air" periods get longer... and eventually, after 3-4 hours, the home is at the desired temperature. 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