We hope you never have to look upon the internet about this article! Waking up in a freezing house because your furnace is not blowing hot air is a nightmare. However, despite being one of the worst things, it is still a thing. So why is your furnace not blowing hot air? In this article, we will let you know about some of the common reasons why your furnace might not be doing its job, which is blowing hot air to keep you warm. Why Is My Furnace Not Blowing Warm Air
Reason 1: The Thermostat
A very common cause of problematic heaters/furnaces is a problematic thermostat. There can be quite a few reasons why your thermostat is the cause of your furnace not blowing hot air. Firstly, you might have your fan set to “on” and not “auto.”
A furnace will blow hot air until the set thermostat temperature is reached and then turn off. Therefore, if your fan is always on, then it will blow air even when the furnace is turned off. This can cause cooling, so make sure you switch your fan to the “auto” setting.
Another reason can be that someone mistakenly turned the thermostat’s temperature to a lower setting. Anyone can do that unintentionally, especially little children. Moreover, sometimes the thermostat’s batteries die. So check your thermostat first and see if there are any issues with it or not.
Reason 2: The Pilot Light
If you have an old gas furnace, this reason is for you. A pilot light is a tiny flame that is constantly burning; these ignite the burners in gas furnaces. If this flame or pilot light is blown out, usually by a very strong wind, it can result in the furnace blowing cold air instead of hot.
Reason 3: The Air Filter
One of the most common reasons for any furnace problem is a neglected air filter. For efficient airflow and efficient working of the furnace, it is important that the air filter is clean and not clogged. Neglected air filters, which are not cleaned routinely, are clogged up with dust and debris. Clogged-up air filters do restrict airflow. This causes the furnace to struggle and work harder to distribute hot air around efficiently. Overwork can cause overheating, and many furnaces shut off at this point to avoid overheating. This can also damage the high-limit switch.
Reason 4: The Burner
Next to the air filter, the burner is another common reason for furnace problems. Just like an air filter, the burner is sensitive to dust and debris buildup. Dust and debris build-up will not allow the fuel to properly reach the burner. This will prevent the generation of heat, which will result in your furnace blowing cold air.
Call a Professional for Help!
If your furnace is not blowing hot air then you should check the above-mentioned and call a professional for help. You might be able to check the thermostat and change the air filter; however, the rest of the things can be tricky to do on your own. Especially the burner, which is a very sensitive part of the furnace. A professional should clean it. If you have not had furnace maintenance for more than a year now, it is time that you call a professional for your furnace’s tuning up and maintenance.