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Gas Furnace Blowing Cold Air

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If so the limit switch a furnace safety device turned the furnace burners off. 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.

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This hot then cold air sequence happens over and over and your home isn t warming up.

Gas furnace blowing cold air. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. Sometimes an absence of warm air from your gas furnace calls for a large repair but a lot of time it can be a small fix. It s possible your furnace overheated.

Once you ve restored the correct setting your furnace should blow warm air. This can cause your furnace to lock down for safety. Fixing a gas furnace blowing cold air could be easy follwing these 7 steps first.

We answer the most common issues causing your gas furnace to blow cold air instead of heat. In such cases a safety control device known as the limit switch will shut off the burners. We hope both because of the many many articles available on the topic of the furnace blowing cold air or not blowing hot air ours strives to be three things.

Other causes of furnaces blowing cold air. Change the air filter. The blower keeps blowing to cool the furnace down to a safe level.

Cold air from your attic or crawlspace gets into your ducts through the holes. A dirty air filter blocks airflow over the furnace s heat exchanger causing it to overheat. However the fan will keep running cooling the furnace to protect it from potential damage.

Have an expert inspect your ducts along with the furnace. Your furnace may be blowing cold air because the filter is too dirty. If your furnace starts blowing warm but then quickly turns cold the flame sensor may need attention.

Here are a few of the more common reasons your gas furnace could be blowing cold air instead of. If your furnace is overheating that means your heat exchanger is getting too hot. Or the gas line isn t supplying enough gas to 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. If your furnace overheats it could end up blowing cold air. Comprehensive we walk through the potential reasons your furnace is not blowing hot air from the most common and easy to solve to more tricky issues.

Large holes and leaks in air ducts can make it seem like your furnace isn t working. 2 furnace overheated let s say your furnace blows hot air then cold air but then stops blowing any air at all after a while. If your gas furnace is blowing cold air and adding a chill to your lexington home it s time to call james heating a c inc.

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