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If you have an older furnace, then it’s possible that the pilot light has gone out. CAUSE: Another common reason for room heater not blowing hot air is broken heater coil. So if you feel the air blowing out of the vents while the furnace is off, the air … So if your furnace shuts down or stops blowing cold air, you’re in a chilly situation. Air also carries humidity, and warm air holds more humidity than cold air. The Pilot Light Has Gone Out. Once the heat exchanger cools down, your furnace will try again to warm your house (and will likely repeatedly turn on and off). The harder it has to work to pull air through the filter, the less efficient it will be. The heater’s blowing cold, or the AC is blowing hot. These 5 fixes can solve most furnace problems without you needing to pay for a repairman to come out. Third – hire a professional. Check your air filter. So what causes the furnace to overheat? This was part of the problem our friend was dealing with. My heater stopped blowing hot air throughout the house what could it be ? 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. Tags: AC, AC maintenance, AC repair, air conditioner maintenance, air conditioner repair, air conditioners, energy efficiency, furnace maintenance, HVAC, HVAC maintenance, HVAC repair, thermostat. But a dead circuit board ends your furnace’s attempt to heat your house real quick. Their improper installation thus led to the air conditioner blowing hot air. If my closet door is open, it feels like a freezer door is open an there's a fan blowing cold air … If you just turned on the heat, hot air may not yet be flowing through your air ducts. 11. First – make it worse. Again, this depends on your specific type of thermostat. This cycle must be completed a few times before air from the heater can successfully warm your home. Your heater has to first collect and compress the air in your home, then heat it and expel the cold air. Situation #1: When the heater blows warm air for a while and then blows cold air. If it is set to “ON”, it will continue blowing air even if … If that happens, your heater (or AC) will not produce the temperature of air you want it to. Have an expert inspect your ducts along with the furnace. If it’s dirty, change it! Solution: Change the air filter and see if your furnace starts only blowing warm air. These simple fixes might solve the problem, saving you lots of trouble, frustration, and expense. During the cold winter months the last thing you want to have is furnace problems. When set to “ON” the fan … If your ducts have cracks or worse, then the cold air blowing into your house might be coming straight from outside right into your ducts, mixed in with the warm air your perfectly functional furnace is producing. The Heater is Too Big/Small – The heater’s size makes a difference to how well it works. Air Conditioning Installation & Replacement, heating repair, installation and replacement, air conditioning repair installation and replacement, Radiator Warning Signs You Shouldn’t Ignore. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. 3 Reasons For Heater Blowing Cold Air In House. Likewise for the air conditioner. Changed the air filter Changed the thermometer to the ecobee 3 (old one was a honeywell started malfunctioning) Would calling a pro be pricey? That was tripping on the air handler, which was supposed to be only for emergency heat. Make sure the thermostat is set to “AUTO”, not “ON”. It may have been closed during the summer for safety reasons. There are many issues that can cause your heater to blow cold air. Sometimes this happens simply because your batteries have died. Hence the hot air. A system error in the controls of the heat pump was forcing an automatic system shutdown just seconds after it started. I've never seen such a thing. Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air. They worked around a failed heat pump by making the emergency heat the main heat. Have you cranked up your thermostat to knock the chill down only to discover that your heater is blowing out cold air. What to do: 1. The first thing you have to do is check to see what type system you own. Check the Pilot Light on Gas Furnaces. You can hear it blowing, but no heat is coming out. 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). 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. In older models, verify that the pilot light is lit. … When he turned on the air conditioner, warm air came out. 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. The Fan Is Off . All Rights Reserved. Not in our service area: Granite Falls, Lake Stevens, Marysville, Renton. When set to “on”, the fan on your furnace will blow continually, even when the furnace isn’t actually heating the air. Meanwhile, you’ll get cold air because the fan continues to run as a safety measure, even after the furnace isn’t producing heat. Your furnace may be blowing cold air because the filter is too dirty. If you clear any debris or blockage and the problem persists, you could have a faulty heating element. Check your thermostat and make sure that it is set to “auto” rather than “on.”. 6. The last five items on the list above require a professional or a new furnace or heat pump to fix them. 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