Furnace Blowing Cold Air On Heat Setting

When set to on the fan on your furnace will blow continually even when the furnace isn t actually heating the air.

Furnace blowing cold air on heat setting.

The furnace has overheated. Gas is not being supplied to the unit. Furnaces use gas and heat pumps use electricity to generate heat. You have leaky air ducts.

Change the air filter a dirty air filter restricts airflow into your furnace. 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. Your furnace is overheating. Yeah that s a lot of possibilities.

Well if your furnace is blowing cold air it s most likely due to one of these problems. If your furnace starts blowing warm but then quickly turns cold the flame sensor may need attention. 2 clogged air filter. The thermostat is set to on if you notice your furnace is blowing hot air some of the time and cold the rest of the time your fan is most likely set to on when the.

Your thermostat is set to on the pilot light is out. 7 reasons your heater blows cold air ac blows hot air 1 dead batteries in thermostat. Have an expert inspect your ducts along with the furnace. So how do you know which problem is causing your furnace to blow cool air.

Seems silly but you d be surprised how often this has happened. 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. Your thermostat settings need to be adjusted. For a heat pump or heater to produce warm air air must flow easily through the filter.

A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat. 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 that is blowing cold air is most likely due to one of four possible causes.