Why is My Gas Furnace Blowing Cold Air?

November 13, 2018

As the temps change, the more you feel the cooler air gusting outside. And … in your home? If your gas furnace is blowing cold air and giving a chill to your St. Louis home, it’s time to reach out to Morgner Inc. Air Conditioning & Heating. Sometimes the loss of warm air from your gas furnace results in a big repair, but often it can be a simple fix. Here are some of the main reasons your gas furnace may be blowing cold air instead of making your home warm and cozy.

Your furnace could be overheating

If you haven’t had routine maintenance performed on your gas furnace for some time and you’ve neglected to replace your air filter, each could be the reason why your furnace is blowing colder air. A dirty air filter can block air from flowing freely through your furnace. If that happens, the furnace could overheat and force the burner to shut down.

Your pilot light may have gone out

Sometimes a lack of warm air from your gas furnace can be attributed to something as simple as a pilot light that’s gone out. It’s possible, particularly with older furnaces, for a gust of air to extinguish a pilot light. Other causes of an extinguished pilot light are faulty gas valves or a faulty thermocouple.

Your furnace is dirty

Just as a dirty air filter can cause problems for your gas furnace, so can other furnace components if they aren’t correctly cleaned. A dirty gas burner or flame sensor could cause your furnace to fight to stay lit and not be able to bring warmth to your home.

Your ducts may not be properly sealed

When ducts are correctly sealed or if they have any cracks or holes in them, you could be losing a lot of heated air before it ever reaches your vents.

No matter what the reason for the problem is, Morgner Inc. Air Conditioning & Heating in St. Louis can help you get your gas furnace up and working at an efficient level again. We can also help keep it running with ongoing, preventive maintenance. Give us a call at 314-262-4541 or schedule an appointment with us online and we’ll be there to help.