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why does my heater blow cold air

Is your furnace running but the air that s blowing out of your vents seems cold? There are a couple things you can do to troubleshoot the problem before calling a heating repair company. You might have walked by a vent and noticed the air seemed cool. But is your home staying warm, at the temperature you set it at? If it is, the problem might be a simple thermostat setting. Check your and make sure that it is set to auto rather than on. When set to on, the fan on your furnace will blow continually, even when the furnace isn t actually heating the air. 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. A dirty air filter restricts airflow into your furnace.

Restricted airflow can overheat your furnace, causing a safety control to shut off the burners. This safety mechanism. So change the air filter if it s dirty. Are you still feeling cold air come out of the vents after trying the above? Your best bet is to have a trusted
company come diagnose the problem. But to give you an idea of what could be wrong, here are other common causes of this problem: If your furnace seems to be blowing cold air, it could be a problem with the ignition system. Basically, the furnace isn t lighting the fuel, meaning it can t heat your home, either. Your gas supply could be turned off. Or the gas line isn t supplying enough gas to your furnace.

This can cause your furnace to lock down for safety. Large holes and leaks in air ducts can make it seem like your furnace isn t working. Cold air from your attic or crawlspace gets into your ducts through the holes. New, have condensate drain lines. Basically, this removes water that is created during the heating process. If the line gets clogged, it can activate a switch that prevents the burners from lighting. If you live anywhere in the Twin Cities area and your furnace is blowing cold air (or not working at all), MSP Heating can help. Give us a call or. We ve been helping homeowners in the Minneapolis-St. Paul metro area with their heating, plumbing and air conditioning problems since 1916. 2) Furnace overheated Let s say your furnace blows hot air, then cold air, but then stops blowing any air at all after a while.

What s the problem? It s possible your furnace overheated. If so, the limit switch, a furnace safety device, turned the furnace burners off. The blower keeps blowing to cool the furnace down to a safe level. So what causes the furnace to overheat? Most commonly, a dirty furnace air filter. The dirty air filter will block airflow, causing the furnace to run longer to heat your home until it overheats. Solution: Change the air filter and see if your furnace starts only blowing warm air. DON T ignore this problem. Repeated overheating will hurt the furnace s heat exchanger, which is expensive to fix.

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