Furnace Blowing Cold Air Then Shutting Off

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. Despite what you are told if your furnace is turning on and off more than eight times per hour. Change the air filter.

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Dirty oil or gas burner.

Furnace blowing cold air then shutting off. If the furnace is coming back on on its own then. A flame sensor that s covered with grime or worn out can cause the burner to keep shutting off. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. This hot then cold air sequence happens over and over and your home isn t warming up.

Furnace shuts down because your furnace has to run longer to heat your home the heat exchanger overheats causing the furnace to automatically shut down. When a heating cycle begins and your air handler turns on that cool air will blow out of your registers before warm air does. Reduces volume of hot air blown out blocked return air means the furnace has less to blow out your supply vents leaving you chilly. Control board is faulty.

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. 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. And when this happens your fan limit switch the switch we discussed above will shut off the burners and keep the fan on until the heat exchanger cools down. A dirty air filter restricts airflow into your furnace.

The blower keeps blowing to cool the furnace down to a safe level. Most commonly a dirty furnace air filter. A properly sized furnace should turn on and off between three and eight times per hour deepening on the characteristics of your house outside air temperatures and other variables. When your furnace isn t running the air in your ducts cools down.

Chimney is clogged causing exhaust to come back down the chimney backflow backflow sensor is clogged broken. You ll need a visit from an hvac professional to make this furnace repair. A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat. These switches can cause the furnace to shut off prematurely or shut off before reaching the.

If so the limit switch a furnace safety device turned the furnace burners off. The dirty air filter will block airflow causing the furnace to run longer to heat your home until it overheats. If your furnace is overheating that means your heat exchanger is getting too hot. If your furnace starts blowing warm but then quickly turns cold the flame sensor may need attention.

Your furnace may be blowing cold air because the filter is too dirty. If this is the case cleaning it will probably make the problem go away. Restricted airflow can overheat your furnace causing a safety control to shut off the burners. If the furnace runs for a minute and then shuts off then its likely that a safety switch has tripped.

When set to on the fan on your furnace will blow continually even when the furnace isn t actually heating the air. Flame sensor is dirty broken. So what causes the furnace to overheat.