Furnace Blowing Cold Air No Heat

Your gas supply could be turned off.

Furnace blowing cold air no heat.

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. 2 clogged air filter. 7 reasons your heater blows cold air ac blows hot air 1 dead batteries in thermostat.

A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat. If your furnace seems to be blowing cold air it could be a problem with the ignition. Otherwise your electric heater or gas furnace will not turn on. 3 pilot light is out if your gas furnace is only.

Seems silly but you d be surprised how often this has happened. Other causes of furnaces blowing cold air pilot light ignition problem. 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. 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. If you haven t been regularly checking and changing your air filter it s most likely extremely clogged. Your furnace may be blowing cold air because the filter is too dirty. Check the thermostat and ensure it is set properly.

For a heat pump or heater to produce warm air air must flow easily through the filter. Most furnaces also have a reset button that clears any issues that might cause the furnace to produce no heat. To troubleshoot a misbehaving gas furnace start with the easiest explanations and solutions then work your way to the most complicated. Again using occam s razor we can assume that the next likely culprit for your heater blowing cold air is your thermostat.

2 furnace overheated let s say your furnace blows hot air then cold air but then stops blowing any air at all after a. Is the furnace s blower constantly running. Or the gas line isn t supplying enough gas to your furnace. Ensure that your thermostat is set higher than the temperature in your home.

Set the thermostat to heat and. A furnace blowing cold air could be due to your thermostat.