Electric Furnace Blowing Cold Air Sometimes

Again using occam s razor we can assume that the next likely culprit for your heater blowing cold air is your thermostat.

Electric furnace blowing cold air sometimes. Fuel is the heat source for every furnace and if there is no fuel being supplied the furnace will only blow cool air. 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. Oil tanks must have oil in them gas supply valves must be open to allow the. A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat.

Basically the furnace isn t lighting the fuel meaning it can t heat your home either. When a heating cycle begins and your air handler turns on that cool air will blow out of your registers before warm air does. Ensure that your thermostat is set higher than the temperature in your home. The dirty air filter will block airflow causing the furnace to run longer to heat your home until it overheats.

Have an expert inspect your ducts along with the 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. If your furnace seems to be blowing cold air it could be a problem with the ignition system. When the thermostat stops calling for heat the furnace will turn the electric heating coils off but allow the fan to continue blowing air until the coils cool down.

Maybe the sensor that turns the fan off is not working and allows the fan to continue blowing too long. A furnace blowing cold air could be due to your thermostat. Both of the electric heat strips heat elements come on. More cool air than warm.

All heat ducts are open. If you only feel your furnace blowing cold air briefly and the air is quickly replaced by warm air this is the most likely explanation. Otherwise your electric heater or gas furnace will not turn on. The furnace turns on off repeatedly.

It blows warm air for a short period and then cool air. If so the limit switch a furnace safety device turned the furnace burners off. The blower keeps blowing to cool the furnace down to a safe level. When your furnace isn t running the air in your ducts cools down.