Why would my gas furnace be blowing cold air?
Your furnace may be blowing cold air because the filter is too dirty. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack.
How do you fix a furnace that blows cold air?
Try turning the furnace off via the power switch. Wait a few minutes, then restart. This is similar to rebooting your computer to fix a software glitch. If the furnace still blows cold air, call in a professional.
Why is my furnace running but no heat?
Furnace filters Dirty filters are the most common cause of furnace problems. Dust and dirt restrict airflow—and if the filter gets too clogged, the heat exchanger will overheat and shut off too quickly, and your house won’t warm up. If the blower is running but no heat is coming out, replace the filter.
Why does my furnace blow cold air before warm air?
When your furnace isn’t running, the air in your ducts cools down. When a heating cycle begins and your air handler turns on, that cool air will blow out of your registers before warm air does.
Why is my furnace blowing cold air instead of heat?
So Why Is My Furnace Blowing Cold Air Instead Of Heat? One of the most common causes of a furnace blowing cold air is not actually a repair at all. If you notice your furnace only blows cold air on occasion but your home is still maintaining its temperature than this may be simply a setting on your thermostat.
Why do I have a bad thermostat on my gas furnace?
Bad Thermostat. Your gas furnace will blow air through the system periodically, even if you do not have the heat on. It will circulate air constantly on certain air settings too. If you turn the heat on and this circulated air is not warm after a few minutes you may have a thermostat problem.
What makes the flame in a gas furnace?
It takes two components to make the flame that your gas furnace produces. The first of those, of course, is the natural or liquid propane gas that comes into your furnace. Air is the other key ingredient that is used to regulate how hot the flame is that your furnace produces.
What happens if the pilot light on my furnace does not work?
If these fail to work your furnace will only blow cold air because there is no heat source to ignite the gas coming into the furnace. For furnace burner systems that use a pilot light, you simply need to relight that pilot light. This is best done using a long match.
What to do when your furnace is blowing cold air?
What to Do If Your Furnace is Blowing Cold Air. Check the thermostat: If the fan is set to “On” it will continue to blow air even when the furnace is not on. That could be the reason for the cold air you are experiencing. Set the thermostat to “Auto”, turn on the furnace and observe what happens. Also check the battery on your digital thermostat.
What does it mean if a furnace is blowing cold air?
If a thermostat is set incorrectly, you might notice your furnace blowing cold air from the heat registers, a lower than expected temperature reading on the thermostat, or you may even hear your air conditioner running outside. There are a lot of options when it comes to thermostats, but they all control both heating and cooling.
Why does furnace blow only warm air?
Most commonly, a dirty furnace air filter. The dirty air filter will block airflow, causing the furnace to run longer to heat your home until it overheats. Solution: Change the air filter and see if your furnace starts only blowing warm air. DON’T ignore this problem.
Why is my furnace not blowing hot air?
Furnace Not Blowing Hot Air – Problems & Solutions The reason your furnace is not blowing hot air could be a setting on the thermostat, a circuit breaker, or a clogged air filter. Other potential problems include a bad blower fan or limit control switch.
