A furnace that blows cold air but is otherwise operating is a vexing problem because it affects your physical comfort. Furthermore, most homeowners are not equipped to diagnose and repair anything but the simplest furnace issues themselves. If the furnace in your Mount Juliet, Tennessee, home is blowing cold air, there could be several possible causes. Read on to learn how to solve them.
Dirty Air Filter
If your furnace is not blowing warm air, a dirty or clogged air filter could be the culprit. Heat gets trapped in by dirt, and as a result, it fails to pass through the furnace’s heat exchanger. This can trip the high-temperature limit switch, which causes the furnace burners to shut off. To prevent taxing your furnace this way, the air filter should be changed regularly.
In many cases, the thermostat itself may be to blame. It could be set improperly, perhaps because of a power outage. By putting the thermostat on the Auto setting, you will ensure that the blower only runs when the furnace is heating the air.
Blown-Out Pilot Light
In order to relight your pilot light, you should turn the thermostat all the way off. Then turn the setting on your furnace for your pilot light to the Off position. Wait a few minutes, and then turn the pilot light setting to On. Ignite the furnace, return the furnace to the On position, and then set the thermostat. At this point, you should have heat flow.
If the pilot light refuses to light, it could be because it is dirty. If the pilot light does light but fails to stay lit, there is a problem with the thermocouple. A thermocouple is a safety device in your furnace that shuts off the flow of gas if the igniter fails or if the pilot light goes out. In most cases, it will need to be replaced.
If your furnace is blowing cold air, let a professional take care of it. Our expert technicians at Bentley’s Air Conditioning provide a wide range of HVAC services. For help with your furnace or any other HVAC issues, call us at (615) 754-2665.
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