Furnace Blowing Cold Air No Heat

If your furnace seems to be blowing cold air it could be a problem with the ignition.

Furnace blowing cold air no heat.

Check the thermostat and ensure it is set properly. Set the thermostat to heat and. 2 furnace overheated let s say your furnace blows hot air then cold air but then stops blowing any air at all after a. A clogged filter will restrict air flow into your home.

Ensure that your thermostat is set higher than the temperature in your home. Otherwise your electric heater or gas furnace will not turn on. Most furnaces also have a reset button that clears any issues that might cause the furnace to produce no heat. You might not think your filter contributes to your ac not blowing cold air but it does.

After ruling out all of the simple problems above the most likely cause of a furnace not blowing air is a problem with the blower fan itself which if you remember is the fan that circulates your house s air over the heated coils. 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. For a heat pump or heater to produce warm air air must flow easily through the filter. Again using occam s razor we can assume that the next likely culprit for your heater blowing cold air is your thermostat.

To troubleshoot a misbehaving gas furnace start with the easiest explanations and solutions then work your way to the most complicated. If you haven t been regularly checking and changing your air filter it s most likely extremely clogged. Is the furnace s blower constantly running. 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.

A furnace blowing cold air could be due to your thermostat. Other causes of furnaces blowing cold air pilot light ignition problem. 2 clogged air filter. Have an expert inspect your ducts along with the furnace.

Your furnace may be blowing cold air because the filter is too dirty. Or the gas line isn t supplying enough gas to your furnace. 3 pilot light is out if your gas furnace is only. If your 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.

1 thermostat is set to on is your furnace blowing cold air only sometimes. A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat.