Furnace Running But Not Blowing Air [Fixed]

Are you dealing with a furnace that is running but not blowing air? If you are then this is the right guide for you. 

If your furnace is running but not blowing air, this could be caused by a faulty blower blower motor or blower wheel. Other causes for this problem include, broken duct work excessively clogged air filters closed or blocked vents.

Possible reasons you have a Furnace running but not blowing air

Possible CauseFix
Bad Blower wheel/ motor capacitorClean/repair or replace wheel or capacitor
Excessively clogged  Replace air filter
Broken duct workSeal off leaks, fix ductwork
Closed ventsOpen vents, unlock vents and registers

Bad blower heel or motor

 Faulty blowers are among the most common reasons your furnace is not blowing air.

A blower assembly comprises several components, including the blower wheel, belt, motor, and capacitor. If any of these components is faulty, it will prevent the blower from effectively moving air.

To begin troubleshooting the problem, you may want to open the furnace and inspect the blower motor.

Check if the motor is spinning when there is a call for heat. While the blower compartment is open, depress the door switch to keep power flowing.

Observe the behavior of the blower motor and follow these steps:

  1. If the blower does not spin, you may have a frozen motor. Turn off the furnace and attempt to manually spin it.and,
  1. If the blower wheel spins freely, you may have a bad capacitor, in which case you’ll need to have it replaced.

In both cases, you’ll need to replace the affected part.

Read also: Furnace Shuts Off After 30 Seconds [Fixed]

Excessively clogged  Air Filters

Another possible reason your furnace may not be blowing air is excessively clogged air filters.

When the air filters become clogged, the blower struggles to circulate air into the heat exchangers, making it more challenging for the furnace to distribute air throughout your home.

To determine whether your air filters are dirty, access your furnace and open the furnace blower compartment to locate them.

Inspect the condition of the filters, and if they appear dirty, consider replacing them as soon as possible.

Always replace your filters every 2-3 months, and if you have pets at home, consider replacing them even more frequently, perhaps every month, to ensure your furnace continues to work in optimal condition.

Read also: Nest Thermostat Blowing Cold Air on Heat [Fixed]

Broken duct work

Another potential cause of your furnace not blowing air when it’s running is broken air ducts. Ducts serve as conduits for the heated or cooled air produced by your HVAC system. 

When there are openings or dislocations along the ducts, air can escape through these gaps, preventing it from reaching its intended destination.

To address this issue, you should first inspect the ductwork for any openings or air leaks. If you find any, you may need to use duct tape to seal off the leaks.

If you feel unsure about performing this task on your own, I recommend contacting HVAC professionals for assistance.

Read also: Bryant Furnace Code 31 [Fixed]

Closed vents

So, if the issues with the blower wheel, ductwork, and air filter have been resolved but your furnace still won’t blow air, you should verify that the air vents and registers in your home are open and not obstructed by objects.

Check the vents around your house and ensure that they are open, allowing air to flow freely.

You may also want to ensure that the vents are not obstructed by objects such as furnace cabinets and rugs, which could impede the free flow of air.

After confirming that you have open vents and registers, try turning your furnace on again by calling for heat.

Read also: Honeywell Thermostat Blowing Cold Air on Heat Setting [Fixed]

Final Thoughts

In a nutshell, if your furnace is operational but not blowing air, it may be due to restricted airflow within the furnace.

This restricted airflow can result from a malfunctioning furnace blower, clogged air filters, damaged ductwork, or closed vents and registers.

If the issue persists after following our guide, it is advisable to seek the assistance of an onsite technician for further help.

Thank you for reading.

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