Furnace Blowing Cold Air Sometimes

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 overheats it could end up blowing cold air. I did some googling and asking around and folks told me my flame sensor was likely bad.

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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.

Furnace blowing cold air sometimes. Most commonly a dirty furnace air filter. Woke up one moring and it was blowing cold air. The dirty air filter will block airflow causing the furnace to run longer to heat your home until it overheats. This hot then cold air sequence happens over and over and your home isn t warming up.

Although the furnace may be sending heated air into the ductwork by the time it gets to the registers it may only. If you have a gas furnace a lack of fuel will cause the pilot light to go out. In such cases a safety control device known as the limit switch will shut off the burners. The blower keeps blowing to cool the furnace down to a safe level.

Have an expert inspect your ducts along with the furnace. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. When a heating cycle begins and your air handler turns on that cool air will blow out of your registers before warm air does. 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.

If your furnace is overheating that means your heat exchanger is getting too hot. Holes broken or unhooked ductwork causes cold air to bleed into the duct system. A furnace that isn t getting fuel will not ignite and will blow only cold air. This can be caused by something as simple as a strong draft.

Your furnace may be blowing cold air because the filter is too dirty. However the fan will keep running cooling the furnace to protect it from potential damage. Sometimes a furnace will start blowing cool air because the pilot light has gone out and might need to be relit. So what causes the furnace to overheat.

Furnace blowing cold air but ony sometimes i have a york diamond 90 furnace up in my crawl space. Change the air filter and see if your furnace starts only blowing warm air. Now let s talk solutions for the causes behind your furnace blowing out cold air nonstop. A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat.