Furnace makes loud rattling or scraping noises from the blower compartment during operation.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Safety: Turn off power before opening the blower compartment. Blower wheels can start unexpectedly if power is on.
Steps:
- Inspect blower wheel: Remove the blower assembly and check that the wheel is firmly attached to the motor shaft with the set screw tight.
- Remove debris: Clear any screws, insulation, or other objects from the blower housing.
- Check for play: Wiggle the motor shaft. Excessive play or grinding indicates worn bearings.
When to call a technician: If the blower wheel is damaged or the motor bearings are failing, replacement is recommended and may require professional balancing and wiring.