How to Fix / Troubleshooting

Safety: Unplug the unit before accessing the blower assembly.

Steps to address squealing/grinding:

Remove front panel: Take off the grille and filter to access the blower area.
Inspect blower wheel: Look for foreign objects (plastic, paper, insulation) rubbing against the wheel. Remove any debris.
Check wheel alignment: Spin the blower wheel by hand. It should rotate smoothly without scraping the housing. If it rubs, loosen the set screw and reposition the wheel on the motor shaft.
Motor condition: If the noise clearly comes from the motor and persists, replace the indoor blower motor. Many Arctic King motors are sealed and not designed for lubrication.
Reassemble and test: After replacing or adjusting, reassemble and run the unit to confirm quiet operation.

High-pitched squealing or grinding noise from the indoor unit when the fan is running.

Possible Causes