Furnace Blowing Cold Air On Heat Setting

The furnace has overheated.

Furnace blowing cold air on heat setting.

Your thermostat settings need to be adjusted. If your furnace starts blowing warm but then quickly turns cold the flame sensor may need attention. A furnace that is blowing cold air is most likely due to one of four possible causes. 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.

2 clogged air filter. Your fan limit switch settings need to be adjusted. What causes a furnace to blow cold air. You have leaky air ducts.

Well if your furnace is blowing cold air it s most likely due to one of these problems. Your thermostat is set to on the pilot light is out. 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 may be blowing cold air because the filter is too dirty.

Have an expert inspect your ducts along with the furnace. 7 reasons your heater blows cold air ac blows hot air 1 dead batteries in thermostat. Change the air filter a dirty air filter restricts airflow into your furnace. So how do you know which problem is causing your furnace to blow cool air.

For a heat pump or heater to produce warm air air must flow easily through the filter. 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 dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat. Seems silly but you d be surprised how often this has happened.

Gas is not being supplied to the unit. Your furnace is overheating. When set to on the fan on your furnace will blow continually even when the furnace isn t actually heating the air.