Furnace Blowing Cold Air In One Room

Your fan limit switch settings need to be adjusted. Change the air filter a dirty air filter restricts airflow into your furnace. I recently rearranged my house to unveil the largest wall register in my living room that was previously covered by my couch.

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Otherwise your electric heater or gas furnace will not turn on.

Furnace blowing cold air in one room. Ensure that your thermostat is set higher than the temperature in your home. If so the limit switch a furnace safety device turned the furnace burners off. You have leaky air ducts. Turn off your furnace.

Turn your thermostat from heat to off. The dirty air filter will block airflow causing the furnace to run longer to heat your home until it overheats. Turn the knob to off and wait. Most commonly a dirty furnace air filter.

So what causes the furnace to overheat. The assembly and switch should be near the bottom of your furnace. Find the furnace s pilot light assembly and reset switch. A furnace blowing cold air could be due to your thermostat.

Your furnace is overheating. Well if your furnace is blowing cold air it s most likely due to one of these problems. If your ducts have cracks or worse then the cold air blowing into your house might be coming straight from outside right into your ducts mixed in with the warm air your perfectly functional furnace is producing. What can i do if my heater is blowing cold air.

Restricted airflow can overheat your furnace causing a safety control to shut off the burners. Your thermostat settings need to be adjusted. One vent only blowing cold air while heat running the rest work fine i have an old house 1940s but the heat furnace is only 8 years old. If you notice your furnace only blows cold air on occasion but your home is still maintaining its temperature than this may be simply a setting on your thermostat.

The blower keeps blowing to cool the furnace down to a safe level. 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. Again using occam s razor we can assume that the next likely culprit for your heater blowing cold air is your thermostat. The fan setting on your thermostat has two options on and auto.

One of the most common causes of a furnace blowing cold air is not actually a repair at all. 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. Have an expert inspect your ducts along with the furnace. First make it worse.

How to troubleshoot a furnace blowing cold air. You ve got three basic options.