Forced hot air furnace blowing cold air

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You have a furnace blowing cold air, which means you are losing money and everyone is bundled up and shivering inside. Sound familiar? A broken furnace is a stressful situation that can make everyone's life difficult. You need to call a furnace repair before it gets worse or before this leads to your furnace not turning on at all. In the meantime, you know that this will happen again next year unless something is done! And if you have a heat pump blowing cold air or room temperature air, our blog about the function of auxiliary heat could be a huge hand to you!

Forced hot air furnace blowing cold air

Furnace maintenance is one of those things that many people put off until winter hits, and they realize that something is wrong. If your find your furnace blowing cold air, here are a few tips to help you find, and potentially fix, the root of the problem. Your furnace fan runs whenever the thermostat calls for heat. You can change it so that it only runs when necessary. However, if you live with other people, you may want to keep an eye on who is pushing the thermostat buttons. When a thermostat battery runs low, it can cause the thermostat to stop working. As a batter starts to decline, so will the thermostat functions. Make sure you replace thermostat batteries at least once every year. If you find your furnace blowing cold air, you may have a dirty or clogged air filter. To make sure, remove the air filter and inspect it. High limit switches are designed to protect the compressor from overheating by shutting off power to the compressor. This can happen when there is too much heat from the compressor or a blockage in the line. If your high limit switch does not work properly, it could cause problems with your furnace.

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Your furnace is blowing cold air. You wait, but the temperature in the house drops. What could have gone wrong? Some solutions are easy fixes. Some require an HVAC contractor with a good tool kit. So why is your furnace blowing cold air?

If your furnace blows cold air sometimes, you most likely have dirty air filters or blocked air vents. However, it could also be something as minor as the wrong thermostat setting or as complex as electrical circuity failure. Nevertheless, you need to act quickly. Otherwise, you may find yourself in the cold for longer than you thought. Below, we discuss the most common reasons why furnaces blow cold air and recommended fixes. Before we get to the common reasons for blowing cold air, perhaps it would help you understand how the furnace generates warm air in the first place and why cold air coming out of the supply vents is an anomaly. Generally, when you push the furnace button to turn it ON, the ignition system kicks on. Ignition systems vary depending on the type of furnace. However, whichever the design, the pilot system will light the burners. This happens automatically as soon as the thermostat calls for heat.

Forced hot air furnace blowing cold air

Lost password? Recover password. Remembered your password? Back to login. A furnace blowing cold air indicates that something is amiss. The furnace might have overheated, or there could be an issue with the thermostat, air filter, pilot light, flame sensor, ducts, condensate line, or gas supply. Furnaces are designed to heat homes. If your furnace is not producing warm air, something is wrong.

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Energy Efficiency unleashed : How…. Call an HVAC technician to inspect cases involving the gas supply. You may be able to clean your flame sensor, but if in doubt, call in a professional. Filter Shop. Heat Pumps. Remove the pan and it with dish soap and water. It only sets the blower in action. Especially if your furnace is blowing cold air. Burners are designed to burn fuel at a very high temperature. At the high limit, the burners turn off and the heat stops.

Chances are, if the temperature has unexpectedly plummeted inside your home, you may have an issue with your furnace. Before you figure out the problem, it helps to learn a little about how your home heating system might work.

Easy Ways to Stay Cool…. Condensate clog New high efficiency furnaces have what is known as a condensate drain. What Should I Expect When…. That cold air mixes with the warm air from hour furnace, causing the air coming from your vents to feel considerably cooler than it should. The flame sensor ensures flames are burning when the gas valve opens. Recover password. Why is My Furnace Blowing…. The thermostat switches the furnace off when the temperature setting is reached. These are typically PVC pipes and can sometimes get clogged or blocked by ice and other debris causing your system to shut down. The furnace should restart after it has cooled down. If you aren't cleaning it regularly, this will accumulate over time, leading to problems with your heating system's efficiency. Winter Plumbing Maintenance Checklist. Water Heaters. We recommend waiting a couple of minutes before setting the reset switch to the On position to allow excess gas to exit from the chamber in your furnace.