Why the Furnace is Running, but Not Blowing Air: Possible Causes and Solutions
A furnace that is running but not blowing air can be a frustrating problem to have. There are several possible causes for this, and it can be difficult to diagnose the issue without the help of a professional.
In this guide, we will discuss some of the most common causes of this problem, and provide solutions to help you get your furnace up and running again.
Most Common Causes of a Furnace That is Running But Not Blowing Air
There are several possible causes for a furnace that is running, but not blowing air. Some of the most common causes include:
Reason 1 - A dirty filter
If your furnace is running but not blowing air, it’s possible that a dirty filter is the culprit. A dirty air filter will impede airflow, and can cause the furnace to overheat. The dirtier the filter gets, the less efficient it will be at trapping dirt and debris.
Be sure to change your furnace filter regularly – every month during the heating season is a good rule of thumb. If you have a pet, you may need to change it more often.
Reason 2 - A clogged air duct
A clogged air duct is another common reason why a furnace may be running, but not blowing warm air. If the air ducts are clogged, the furnace will work harder than necessary to push heated air throughout your home. This can cause the furnace to overheat and shut down.
The best way to prevent a clogged air duct is to regularly clean your vents and registers. You should also check for any obstructions in the ducts, such as birds’ nests or debris. If you do find an obstruction, remove it and clean the ducts as necessary.
Reason 3 - Blower issues
The blower is responsible for pushing heated air through the furnace, and out into your home. If it’s not working properly, you won’t be able to heat your home.
There are a few things that could cause the blower to stop working. It could be a problem with the fan belt, the bearings, or the blower motor itself.
If the blower isn’t working, you’ll need to replace it. Contact a furnace technician to do this for you. They will be able to determine what’s wrong with the blower and fix it. If it’s a problem with the belt, bearings, or motor, they will be able to replace those as well.
Reason 4 - The pilot light is out
If the pilot light is out, the furnace will not turn on. The pilot light is a small flame that ignites the gas in the furnace to create heat. If this flame goes out, there will be no heat coming from your furnace.
If your pilot light is out, you will need to relight it. This can be done with a lighter or matches. The instructions for relighting the pilot light can usually be found on the furnace itself, or in the owner’s manual.
Once the pilot light is lit, you should wait a few minutes before trying to turn on the furnace again.
Reason 5 - Thermostat error
The thermostat is one of the most important parts of your heating system. It tells your furnace when to turn on and off. If there is a problem with your thermostat, it could cause your furnace to run, but not blow any air.
There are several things you can do to troubleshoot a thermostat error:
If you are still having problems with your thermostat, you may need to call a technician.
Reason 6 - Gas supply is off or blocked
The gas supply to your furnace may be turned off or blocked. This is often due to a gas leak, which must be fixed before you can turn on the furnace again. If you smell gas in your home, do not turn on the furnace and call a technician immediately.
Check to see if the gas supply to your furnace is turned on. If it is, call a furnace technician to investigate or repair the source of the gas leak. Once the leak has been fixed, you can turn on your furnace again.
Reason 7 - Furnace breakers trip
If your furnace breaker trips, it’s likely because of an overloaded circuit. This can be caused by several things: too many lights turned on in the room, a high-draw appliance like a space heater, or even another furnace running in the house.
If your breaker trips, first try turning off some of the other appliances in the room. If that doesn’t work, you may need to have an electrician come out and inspect your circuit.
There could be something wrong with the wiring that’s causing the breaker to trip. Once it’s fixed, your furnace should start blowing air again.
These are just a few of the possible causes of a furnace that’s running, but not blowing air. By following the advice we’ve given, your furnace should be blowing hot air in no time. If after diagnosing and solving the problem, it’s still malfunctioning, then don’t hesitate to call a technician for help.
Frequently Asked Questions
Why is my furnace running but not blowing cold air?
If your furnace is running, but not blowing cold air, this could be due to a variety of reasons such as a broken fan belt, clogged filters, or a problem with the thermostat.
Does the gas valve go bad on the furnace?
It’s possible for the gas valve to go bad on a furnace, but this is usually not the case. Most of the time, if the furnace isn’t blowing any air, it’s because of another problem.
Does a clogged air filter cause the furnace to not to blow air?
A clogged air filter can cause the furnace to not blow any air, especially if it’s been a while since it was last replaced. Clogged filters can also cause the furnace to run, but not generate enough heat.