Since the heater core is often the high point in a cooling system, air can move into it … Electric Furnace. First – make it worse. Otherwise it has to work a lot harder just to pull the air, which means you’ll get less warm air coming out than you should. Check your air filter. Solution: Change the air filter and see if your furnace starts only blowing warm air. The thermostat’s fan is set to ON. If that happens, your heater (or AC) will not produce the temperature of air you want it to. Once the heat exchanger cools down, your furnace will try again to warm your house (and will likely repeatedly turn on and off). The heater’s blowing cold, or the AC is blowing hot. Sometimes this happens simply because your batteries have died. If you need a professional and you live in our service area, we’d love to help. You might even try turning your circuit breaker off and back on. This was part of the problem our friend was dealing with. You might be able to tell if your ducts have a leak, but fixing them is another issue. These simple fixes might solve the problem, saving you lots of trouble, frustration, and expense. The Heater is Too Big/Small – The heater’s size makes a difference to how well it works. Heating systems work by heat exchange, which means that your HVAC system returns the cold air to the outside of your house. Why Is My Furnace Blowing Cold Air? There could be two possible causes for this: The thermostat fan is set to “ON” The fan in the furnace is responsible for blowing heated air through the vents. The same issue exists during summer, only in reverse. Why Is My Furnace Blowing Cold Air Sometimes? Check your thermostat and make sure that it is set to “auto” rather than “on.”. The dirty air filter will block airflow, causing the furnace to run longer to heat your home until it overheats. 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. But, when it's running - just occasionally, and I guess it's when it's heating the water - it creates freezing cold air. Problem: Heater is blowing cold air. For a heat pump or heater to produce warm air, air must flow easily through the filter. This cycle must be completed a few times before air from the heater can successfully warm your home. But all you have to work with are the symptoms. (This problem depends in part on the type of thermostat, of course). If energy efficiency is as important to you as heating or cooling your house, making sure you have a clean air filter is a critical troubleshooting and maintenance step. Why tell this story? If you hear that irritating screeching sound when your system turns on, this could be the reason (though it’s not the only reason that happens). This field is for validation purposes and should be left unchanged. That’s what our friend’s former homeowners appear to have done. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. So if you feel the air blowing out of the vents while the furnace is off, the air … Another common problem is when air gets into the cooling system. Their improper installation thus led to the air conditioner blowing hot air. Why tell this story? If your heater is blowing warm air but that air is venting into the attic or mixing with colder air from your attic, then the result will be that your heater is blowing cold air. 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. SOLUTION: Check if there are any breaks in the line after opening up the case. My heater stopped blowing hot air throughout the house what could it be ? Air also carries humidity, and warm air holds more humidity than cold air. That was tripping on the air handler, which was supposed to be only for emergency heat. There are many issues that can cause your heater to blow cold air. Check the air filter. It may have been closed during the summer for safety reasons. Solution Based Plumbing & Heating. In older models, verify that the pilot light is lit. CAUSE: Another common reason for room heater not blowing hot air is broken heater coil. Situation #1: When the heater blows warm air for a while and then blows cold air. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. Your System Was Just Turned On. 11. The previous owners in our friend’s house probably realized their heat pump was failing, so they rewired the system in a convoluted way to get around the problem, rather than deal with it properly. The blower keeps blowing to cool the furnace down to a safe level. If your heater stops blowing after a short period or starts emitting cold air, it might be a good idea to check if the furnace is working fine. And, it increased their heating costs a ton, because the air handler is a far more expensive way to heat a house than the much more efficient heat pump. They worked around a failed heat pump by making the emergency heat the main heat. Here are just a few things that could mean: Seems silly, but you’d be surprised how often this has happened. It's heating the water just fine, and is a new hot water heater. 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. The most common type is the furnace or heat pump, which is generally connected to a ducted air system. If so, your heat pump is blowing warm air that just feels cold to you. When set to “on”, the fan on your furnace will blow continually, even when the furnace isn’t actually heating the air. So what causes the furnace to overheat? If your heater turns on but it’s blowing cold air, turn it off and check to make sure there’s nothing obstructing the blower. You can follow any responses to this entry through the RSS 2.0 feed. When this occurs, your furnace can’t heat the air like it’s supposed to. When he had a professional look into why this was happening, he learned it would be an expensive repair job on an outdated heat pump. This rendered the AC useless. An electric heater that blows cold air could be caused by one or more of the following reasons: The manual reset has tripped. If the filter looks like the filter to the right in the picture below, replace it. In extreme cases, low humidity can even crack wooden furniture. Check the thermostat. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. His heat pump was starting up and then shutting off immediately, and the emergency heat was taking over. You can hear it blowing, but no heat is coming out. The harder it has to work to pull air through the filter, the less efficient it will be. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. When your furnace isn’t running, the air in your ducts cools down. Meanwhile, you’ll get cold air because the fan continues to run as a safety measure, even after the furnace isn’t producing heat. Both comments and pings are currently closed. If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. Have an expert inspect your ducts along with the furnace. When he turned on the air conditioner, warm air came out. So if your furnace shuts down or stops blowing cold air, you’re in a chilly situation. When set to “ON” the fan … Again, this depends on your specific type of thermostat. There are two different system types: forced air duct systems that push warm air with the aid of a blower into the system and vents, and gravity furnace systems that use convection currents to circulate the warm air. Think dry skin, chapped lips, and static electricity. Another possible problem is the accumulation of dirt and debris inside of ductwork which can slow down airflow. Do I Really Need to Clean My Gas Fireplace. Your heat pump might be in “defrost mode” When in defrost mode, a heat pump may blast cold air from its vents for 1 or 2 minutes (before the backup heat kicks in). When a heating cycle begins and your air handler turns on, that cool air will blow out of your registers before warm air does. The Pilot Light Has Gone Out. Have you cranked up your thermostat to knock the chill down only to discover that your heater is blowing out cold air. There are a few reasons your heat pump could be blowing cold air. Heat Pump Blowing Cold Air | Refrigeration Heating Troubleshooting. The Fan Is Off . But the heat pump was also just very old, and repairing it would have cost nearly the same as just getting a new one, which is what they ended up doing. If my closet door is open, it feels like a freezer door is open an there's a fan blowing cold air … The fan switch is “on” and the thermostat setting is below the actual temperature; The fan is dispersing this air after shutdown; There may be a loose wire coming from the elements; The heater element may be defective During the cold winter months the last thing you want to have is furnace problems. If your heater is blowing warm air but that air is venting into the attic or mixing with colder air from your attic, then the net result will be that your heater is blowing cold air. Your furnace may be blowing cold air because the filter is too dirty. Rebecca, if I were close to where you live, I would come out and take a look at your system and tell you what was wrong and repair it for you. Third – hire a professional. Though on closer inspection, the heat seemed pretty weak. I've never seen such a thing. Maybe it got shorted out. If your heater is blowing cold air, and it’s not one of the first two possible explanations on this list, then you’ll need a specialist to at least come and take a look. But a dead circuit board ends your furnace’s attempt to heat your house real quick. Second – test out the simple explanations. Airflow Issues: Another possible problem is the accumulation of dirt and debris inside of ductwork which can slow down airflow. … Tags: AC, AC maintenance, AC repair, air conditioner maintenance, air conditioner repair, air conditioners, energy efficiency, furnace maintenance, HVAC, HVAC maintenance, HVAC repair, thermostat. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. Not in our service area: Granite Falls, Lake Stevens, Marysville, Renton. A friend of ours bought a new house recently. Changed the air filter Changed the thermometer to the ecobee 3 (old one was a honeywell started malfunctioning) Would calling a pro be pricey? You’re standing there pushing buttons trying to heat up the house, but it’s just not working. 1.Your Heater hasn’t had time to warm up. Air Conditioning Installation & Replacement, heating repair, installation and replacement, air conditioning repair installation and replacement, Radiator Warning Signs You Shouldn’t Ignore. All Rights Reserved. Your heater has to first collect and compress the air in your home, then heat it and expel the cold air. Hence the hot air. If you are unsure if your location is within our service area, please contact us to find out! Why is the heater blowing cold air from the vents - YouTube If you clear any debris or blockage and the problem persists, you could have a faulty heating element. If you just turned on the heat, hot air may not yet be flowing through your air ducts. What to do: 1. But all you have to work with are the symptoms. If you find that your heater isn’t producing warm air, check the thermostat. Well this happens sometimes and a few things can be the cause. If you only feel your furnace blowing cold air briefly, and the air is quickly replaced by warm air, this is … There are other reasons your heat pump could be blowing cold air instead of heat, but those are the basics. Compromised flame sensor. If it is set to “ON”, it will continue blowing air even if … Verify that the circuit breaker controlling the system has not tripped. Call a professional for inspection and repairs. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. To protect the heater from malfunctioning altogether, engineers embed automatic limit switches that are responsible for turning the heat-generating furnace off. If you turn it up and the air blowing through you house is still cold, then this isn’t the cause of the problem. Likewise for the air conditioner. These 5 fixes can solve most furnace problems without you needing to pay for a repairman to come out. The first thing you have to do is check to see what type system you own. Thank you very much in advance. 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. on Thursday, November 8th, 2018 at 12:26 am and is filed under AC service, Home heat service, maintenance. It’s also possible you have it on the wrong setting, such as ‘fan’ as opposed to ‘heat’. Make sure the thermostat is set to “AUTO”, not “ON”. 3 Reasons For Heater Blowing Cold Air In House. The house stays at a constant 72 degrees (what it's set at), but I'm afraid that the unit may be in need of repair or replacement, or that it might be using more energy than necessary. The last five items on the list above require a professional or a new furnace or heat pump to fix them. Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air. Electric heaters require power. A system error in the controls of the heat pump was forcing an automatic system shutdown just seconds after it started. 6. Heat Pump – If a heat pump is blowing cold air, its auxiliary heat strips might be malfunctioning or the level of refrigerant might be too low. Check to make sure that your gas supply line valve is open. The result is a heater blowing cold air. Below are some reasons you may be getting a blast of chilly air and how you can warm up your house as soon 1as possible. Motors that turn the fans and make the conversion process from warm to cold (or cold to warm) work right can get old and rusty, or break down for other reasons. When enough cold air infiltrates your home, the humidity might become uncomfortably low. But if your heating system is only blowing cold air, it could mean one of several different things. The wires together work as a complete circuit and in case any of them snaps from the constant heating and then cooling then the circuit may get broken and may stop giving off heat. Check the fan setting on your thermostat, and if it’s set to ON, switch to AUTO. An electric heater that blows cold air could be caused by one or more of the following reasons: The manual reset has tripped. Have been a potential cause to this entry through the RSS 2.0 feed you to. More humidity than cold air, air conditioning ) system might stop.... In older models, verify that the circuit breaker off and back on wrong,! 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