Electric Furnace Blowing Cold Air On Heat

A furnace blowing cold air could be due to your thermostat. If your furnace is overheating that means your heat exchanger is getting too hot. A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat.

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This hot then cold air sequence happens over and over and your home isn t warming up.

Electric furnace blowing cold air on heat. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. Basically the furnace isn t lighting the fuel meaning it can t heat your home either. Auto ensures that the blower will run only when the furnace heats the air. Again using occam s razor we can assume that the next likely culprit for your heater blowing cold air is your thermostat.

Your furnace may be blowing cold air because the filter is too dirty. Check the furnace s air filter. 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. If your furnace seems to be blowing cold air it could be a problem with the ignition system.

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. 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. Otherwise your electric heater or gas furnace will not turn on. Ensure that your thermostat is set higher than the temperature in your home.

Have an expert inspect your ducts along with the furnace.