top of page

Furnace blower motor maintenance

Maintaining your furnace blower motor is crucial for ensuring your heating system operates efficiently and lasts longer. The blower motor is responsible for circulating warm air throughout your home, so any issues with the motor can lead to poor airflow and uneven heating. Here are some maintenance tips and common problems associated with furnace blower motors:


Furnace Blower Motor Maintenance Tips


  1. Turn Off Power

    • Safety First: Before performing any maintenance on your furnace, always turn off the power to the unit by switching off the circuit breaker or using the power switch on the furnace.

  2. Inspect the Blower Motor

    • Visual Check: Look for any visible signs of wear, damage, or excessive dust buildup around the blower motor. Dust and debris can interfere with the motor’s performance.

    • Check for Unusual Noises: When operating, listen for any strange sounds like grinding or squealing, which could indicate a problem with the motor or the bearings.

  3. Clean the Blower Motor

    • Clean the Motor and Housing: Dust, dirt, and debris can accumulate around the motor. Use a soft brush or vacuum with a hose attachment to gently clean the motor and its housing. Be careful not to damage any components.

    • Lubricate the Motor (if necessary): Some blower motors have oil ports for lubrication, especially older models. If your motor has lubrication ports, apply a few drops of motor oil to ensure smooth operation. Check the owner’s manual for specific instructions on lubrication.

  4. Check the Blower Wheel (Fan)

    • Inspect for Debris or Damage: The blower wheel can collect dirt or get damaged over time. Check for obstructions or visible damage to the wheel, and clean it thoroughly if needed.

    • Check for Proper Alignment: The blower wheel should be securely attached and properly aligned with the motor shaft. Any misalignment can lead to imbalance, reducing efficiency and causing unnecessary wear.

  5. Inspect the Furnace Filter

    • Replace the Filter: A clogged filter can cause the blower motor to work harder, leading to overheating or failure. Replace the furnace filter regularly (every 1-3 months) to maintain airflow and protect the motor from dust buildup.

    • Check Filter Placement: Ensure the filter is correctly placed and properly sized for the furnace. An incorrect filter can restrict airflow, affecting the blower motor.

  6. Inspect the Ductwork

    • Check for Blockages: Restricted ductwork can put extra strain on the blower motor. Inspect ducts for obstructions or leaks and ensure there is proper airflow to all rooms.

    • Seal Leaks: If you find any leaks in the ductwork, seal them to ensure the air flows efficiently through the system.

  7. Test the Motor

    • Test Operation: After cleaning and checking components, turn the furnace back on and test the blower motor. Ensure the fan is blowing air consistently, without any unusual vibrations or noise.

    • Check for Overheating: If the blower motor becomes unusually hot to the touch, this could indicate an issue that requires professional repair.

  8. Check the Capacitor (if applicable)

    • Inspect for Wear: If your blower motor uses a capacitor to help start the motor, check for any signs of damage or wear, like bulging or leaking fluid. A faulty capacitor can cause the motor to run inefficiently or fail.


Most Common Problems with Furnace Blower Motors

  1. Blower Motor Not Turning On

    • Possible Causes:

      • Faulty capacitor

      • Blown fuse or tripped circuit breaker

      • Bad motor connections or electrical issues

      • Faulty thermostat

    • Solution: Check the capacitor and the electrical components. If you're unable to fix it, you may need to call a professional.

  2. Motor Runs But Doesn’t Blow Air

    • Possible Causes:

      • Clogged or dirty furnace filter

      • Blocked or disconnected ductwork

      • Blower wheel damage or obstruction

    • Solution: Replace the filter, clean the blower wheel, and check the ductwork for blockages.

  3. Motor is Overheating

    • Possible Causes:

      • Lack of lubrication (for older motors)

      • Clogged air filter

      • Poor airflow due to restricted ducts

      • Blower motor bearing failure

    • Solution: Clean the filter, lubricate the motor, and check the ductwork for any restrictions. If the motor continues to overheat, it might need replacement.

  4. Noisy Blower Motor

    • Possible Causes:

      • Worn-out blower motor bearings

      • Dirt buildup on the blower wheel or motor

      • Misalignment of the blower wheel or fan

    • Solution: Clean the motor and blower wheel, and lubricate the motor if it has oil ports. If the noise persists, the motor bearings may need replacing.

  5. Intermittent Blower Motor Operation

    • Possible Causes:

      • Faulty thermostat

      • Loose electrical connections

      • Failing capacitor

    • Solution: Inspect the thermostat and check all electrical connections for any loose wires. If the capacitor is damaged, replace it.

  6. Blower Motor Not Responding to Thermostat Settings

    • Possible Causes:

      • Incorrectly wired thermostat

      • Faulty fan limit switch

    • Solution: Ensure the thermostat is wired correctly. If the fan limit switch is faulty, it may need to be replaced.

Get virtual help with DIY jobs with our xPorch App

app_call_screen.PNG

xPorch © 2025

Ask Us Anything!

Get help from a virtual expderts to fix your home renovation

xPorch offers homeowners the power to complete basic DIY repairs and renovations without spending hundreds of dollars on service calls. With xPorch, DIYers are a couple of clicks aways from connecting with experienced plumbers, electricians, and contractors. Our team offers on-demand virtual services around the year around all Canadian provinces.

 

  • Instagram
  • Facebook

Terms & Conditions    Privacy Policy  

bottom of page