Why Is My Furnace Blowing Cold Air?

November 11, 2020

Why Is My Furnace Blowing Cold Air?

In Canada, we all eventually become tired of cold weather. And when you have to take long, endless, and inevitable walks in freezing cold temperatures to get to your house, office, or grocery store, you realize how blessed you are to have a heating system indoors. However, sometimes it happens that when you reach your destination, you realize that instead of being welcomed by a warm toasty space, you enter into an unpleasant and cold surprise. And soon you discover that the heating system is not working correctly or is broken or even worse, is blowing cold air!

Broken furnaces can create a lot of problems. Besides making residents and visitors highly uncomfortable and cold, it can risk frozen pipes and damage the whole HVAC system. For this reason, you must know what caused your system to malfunction. Hiring an HVAC expert to get your furnace repaired is the quickest and easiest way to avoid unnecessary time in cold air interrupting your daily tasks.

Some of the most common causes for why your furnace could be blowing cold air is:

Incorrect Thermostat Setting

One of the main reasons why your furnace may be blowing cold air is that it could be set to the wrong thermostat setting. Thermostats have various options that could be on the incorrect settings, or it may be broken entirely. To fix the problem, make sure the thermostat is working correctly and is set to AUTO and not ON. When the thermostat is set to ON, the fan blows out cold air without heating it. Change the setting back to AUTO, and you will have a warm, cozy home again.

Dirty Flame Sensor

Dirty flame sensors are a common cause of furnaces that blow cold air. If you haven’t kept up with the biannual maintenance for your furnace, then your pilotless ignition furnace’s flame sensors can become dirty and cause the furnace to malfunction. Scheduling biannual maintenance with a professional HVAC contractor like Nor-Can Heating & Air is crucial if you want your heating system to run efficiently.

Overheated Furnace

Often, problems with the furnace, like dirty air filters, can cause it to overheat. However, every furnace comes with safety features that allow the system to turn off the burner the minute the system starts to overheat. And while the burner is off, the blower keeps blowing cold air to cool off the furnace. So, if you feel cold air coming out of your air vents, it may be because of this reason.

To fix the problem, try cleaning the furnace’s air filters. If the furnace still blows cold air, call in a professional HVAC contractor.

Extinguished Pilot Light

If you have a gas furnace that requires continuous pilot light to blow heated air, having the pilot light go out can cause your system to blow cold air. The pilot light can go out for many reasons, and if you’re comfortable doing it, you can relight the pilot light using the instructions in your furnace’s manual.

However, if you don’t know how to relight it, you can always call a professional like Nor-Can Heating & Air for help. Moreover, if you get the pilot light lit, but it won’t stay lit, there is likely some other problem with the furnace. For example, you may have a faulty thermocouple that needs repair or replacement.

About Nor-Can Heating & Air

Nor-Can Heating & Air is an HVAC contractor in Edmonton. It offers the highest quality of installation, repair, and replacement services for all kinds of heating systems, including furnaces. If you live in Edmonton and notice your furnace is blowing cold air instead of hot, give us a quick call, and we will take care of your heating needs. For more information on our heating systems, visit our website or contact us today for customized service.


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