How to Replace a Furnace Draft Inducer Blower

          

The draft inducer blower is a critical component of your furnace, responsible for safely expelling combustion gases and ensuring efficient operation. When it begins to fail, you might notice unusual noises, ignition issues, or even system shutdowns. Replacing a faulty furnace draft inducer blower can restore proper airflow and prevent more serious problems. While it may sound intimidating, this repair is manageable with the right tools and guidance. To maintain the smooth operation of your heating system, we'll show you how to safely and successfully replace a furnace draft inducer blower in this comprehensive guide.

Steps to Replace a Furnace Draft Inducer Blower

Replacing a furnace draft inducer blower requires careful attention to safety, tools, and wiring. Follow these detailed steps to remove the old unit and install a new one correctly.

Step 1: Identify the Problem

Before replacing the draft inducer blower, be sure it’s the actual source of the issue. Common symptoms of a failing draft inducer include:

  • Loud or grinding noises during furnace startup

  • Furnace not igniting or starting intermittently

  • A burning smell from the motor area

  • Error codes on the furnace control board (consult the manual for specifics)

  • The inducer fan not spinning at all when the furnace initiates a heating cycle

Use these signs, along with your furnace’s diagnostic features, to confirm that the draft inducer blower is the component needing replacement.

Step 2: Gather Tools and Materials

Being prepared before you start makes the replacement process smoother and safer.

Tools Needed:

  • Screwdrivers (Phillips and flathead)

  • Nut driver set or socket wrench

  • Multimeter (to test voltage and continuity)

  • Needle-nose pliers

  • Soft cloth or rag

  • Vacuum or brush (for dust and debris)

Materials Needed:

  • Manufacturer-approved replacement draft inducer blower

  • New gasket or sealant (if required)

  • Furnace manual (optional but helpful)

  • Electrical tape (if wiring repairs are needed)

Make sure the new inducer blower matches your furnace's make and model exactly—check the model number printed on the old part or inside the furnace cabinet.

Step 3: Turn Off Power and Gas Supply

Safety is paramount. Before starting any disassembly:

  • Shut off power to the furnace at the breaker panel.

  • Turn off the gas supply using the shutoff valve near the furnace.

  • To make sure the system shuts down completely, wait a few minutes.

Never work on electrical or gas appliances while they’re connected or live.

Step 4: Access the Draft Inducer Blower

Most draft inducer blowers are located in the upper section of the furnace, near the flue pipe. To access it:

  • Remove the front panel of the furnace.

  • Locate the metal or plastic blower housing near the exhaust port.

  • If necessary, remove any brackets or vent pipe connections that obstruct access.

Refer to your furnace manual to confirm the location and attachment style.

Step 5: Disconnect Electrical Connections

Carefully disconnect the wiring from the draft inducer blower motor.

  • Take a photo of the wiring setup for reference.

  • Unplug any wire harnesses or remove spade connectors using needle-nose pliers.

  • If the wires are taped or bundled, gently separate them.

Label wires if you're unsure about remembering their placement. Some motors also have grounding wires—be sure to remove those too.

Step 6: Remove the Old Draft Inducer Blower

Now you can take out the old blower:

  • Remove the mounting screws or bolts that secure the inducer to the furnace.

  • Carefully lift or slide the blower out of its housing.

  • If there’s a gasket, inspect it for damage or buildup. If you're replacing the blower, it's recommended to also install a new gasket.

  • Clean the mounting surface with a soft cloth to remove dirt and residue.

Take care not to damage any nearby wires or gas lines during removal.

Step 7: Inspect the Flue and Housing Area

Before installing the new blower, inspect the flue pipe and housing area for blockages or wear:

  • Use a flashlight to check for obstructions in the flue.

  • Clear out dust, debris, or insect nests using a vacuum or small brush.

  • Ensure the exhaust path is clear from the blower through the vent to the outside.

Step 8: Install the New Draft Inducer Blower

Position the new blower assembly exactly as the old one was installed.

  • Align the screw holes on the blower with those on the furnace housing.

  • If a gasket or sealant is required, install it per manufacturer instructions.

  • Secure the new inducer using the same screws or bolts you removed earlier.

  • Ensure it fits snugly without gaps around the housing.

Do not overtighten the fasteners—this could crack the blower housing or strip threads.

Step 9: Reconnect Wiring

Now reattach the electrical connections:

  • Refer to the photo or labels you made earlier.

  • Plug in or connect all wires to their corresponding terminals.

  • Ensure all connections are tight and no bare wires are exposed.

  • Reattach the ground wire if one was present.

Double-check that wires are not pinched or rubbing against moving parts.

Step 10: Restore Power and Gas

With everything in place:

  • Restart the gas supply.

  • Flip the furnace breaker to restore power.

  • Replace the furnace access panel and secure it in place.

You’re now ready to test the new draft inducer blower.

Step 11: Run a Test Cycle

Start the furnace and observe its operation:

  • Set the thermostat to call for heat.

  • Listen for the inducer blower to kick on before ignition—this should happen within a few seconds.

  • Make sure the blower runs smoothly and quietly.

  • Confirm that ignition occurs and the burners light properly.

  • Let the furnace complete a full heating cycle.

If everything runs normally, the installation was a success.

Step 12: Monitor Performance Over Time

After installing the new blower, monitor your furnace for a few days:

  • Ensure startup is consistent and the draft inducer runs each time.

  • Listen for unusual noises, rattling, or vibrations.

  • Check for error codes or system lockouts.

Regularly inspecting the system ensures long-term performance and prevents future failures.

Tips to Maintain a Furnace Draft Inducer Blower

Proper maintenance of your furnace draft inducer blower is essential for ensuring safe, efficient heating and extending the life of your furnace. While this component doesn’t require daily attention, a few simple practices can prevent costly repairs and improve overall performance.

Keep the Area Clean

Dust, pet hair, and debris can accumulate around your furnace, increasing the risk of clogging or overheating.

  • Regularly vacuum the area around the furnace.

  • Wipe down exterior surfaces to reduce dust accumulation.

Replace the Air Filter on Schedule

A clogged air filter causes the furnace to work harder, putting additional strain on the draft inducer blower.

  • Replace or clean your furnace filter every 1–3 months, depending on usage and air quality.

  • Use the correct filter size recommended by the manufacturer.

Inspect the Vent and Flue Pipes

Blocked or damaged vents can force the inducer blower to work harder, leading to premature failure.

  • Check vent pipes for blockages (e.g., nests, snow, or debris).

  • Ensure the flue connection is sealed and properly aligned.

Listen for Unusual Noises

Grinding, humming, or rattling sounds may indicate a failing motor or debris in the blower housing.

  • Schedule service promptly if you notice odd sounds at startup.

Schedule Annual Furnace Maintenance

Get your furnace serviced and examined by a professional at least once a year.

  • Technicians will check the inducer motor, test voltage, and lubricate components as needed.

Regular maintenance helps your draft inducer blower operate efficiently and prevents unexpected breakdowns during peak heating season.

Replacing a furnace draft inducer blower may seem complex, but with the right tools, safety steps, and attention to detail, it’s a manageable task for many homeowners. A properly installed inducer blower ensures efficient combustion, safe ventilation, and reliable furnace operation. Regular maintenance and early identification of issues can extend the life of the new component. If you’re ever unsure during the process, don’t hesitate to consult a qualified HVAC professional for guidance or installation support.

Written by Allen Rode for PartsHnC, your trusted source for high-quality HVAC parts, including furnace draft inducer blowers, and more.

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