If your furnace is blowing cold air, there are a few different issues that could be responsible. Furnaces rely on many closely interlinked components. That means that furnace issues, such as a furnace blowing cold air, can be difficult to diagnose. If you are not able to figure out why your furnace is blowing cold air, call you HVAC service team for help. Some furnace issues can be dealt with at home, but an important part of furnace safety is knowing when it is time to call in a HVAC professional.
In the greater St. Louis area, if you are having issues with your furnace blowing cold air, and would like a seasoned heating & air conditioning professional to take a look, call Galmiche & Sons today.
Check These Four Things First
To start with the things you can do yourself, here are four ways to investigate a furnace that is blowing cold air. In the next section, we will cover how to determine when to call in a professional.
- Check your thermostat’s settings: One thing to look out for in particular is your thermostat’s FAN setting. The FAN setting should be set to AUTO rather than ON. If you have it set to ON, the fan will blow air through your home even when your furnace is not heating that air.
- Replace your furnace air filter: A dirty air filter can create problems for your home’s HVAC system. Clogged air filters make it difficult for air to flow out of your furnace and can trip sensors in your HVAC system to turn off the furnace. Changing your air filter is pretty easy and can help prevent wear and tear on your HVAC system even when you are not experiencing furnace problems.
- Relight the pilot light: Sometimes, especially in older furnaces, the pilot light can go out and need to be re-lit. This is something you can do on your own as well. You can consult your furnace’s manual for instructions on how to light a pilot light specific to your model. Even if the pilot light is on, turning it off and then relighting it again can help you fix a furnace that is blowing cold air.
- Check your condensate line: Your furnace might be blowing cold air because of a blockage in your condensate line. When water produced by your HVAC system cannot drain correctly the system sometimes turns off automatically. Check for built up dust and mold in your condensate drain pan. Another potential issue is ice build-up, especially during cold weather. There are tutorials for unclogging condensate drain lines and, if the problem is ice, you can insulate the line with pipe insulation and tape.
What to Do if Your Furnace Keeps Blowing Cold Air
If you have checked each of these components and your furnace is still blowing cold air, it is time to get help finding out why. For pilot light issues, you should call a professional if your pilot light keeps going out repeatedly rather than once in a while. Similarly, if your condensate line appears not to be draining, but is not clogged or icy, it could be a problem with the condensate pump. In this case, too, you should get help from your HVAC service team in order to stop your furnace from blowing cold air.
Get More Information About Why Your Furnace is Blowing Cold Air
If you are still having issues with your furnace blowing cold air after reviewing these common signs and problems, connect with our heating & air conditioning professionals at Galmiche & Sons today!
