Comfortmaker Indoor Blower Mechanical Failure

Comfortmaker indoor unit makes loud squealing or grinding noise when running

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

Worn blower motor bearings, Loose blower wheel on shaft, Debris in blower housing, Bent blower wheel

Safety: Turn off power to the air handler before removing blower access panel.

Steps:

Inspect blower wheel: Check for looseness on the motor shaft; tighten set screw if loose.
Remove debris: Clean out any foreign objects or heavy dust buildup.
Check motor bearings: Spin wheel by hand; if noisy or rough, replace motor.
Balance wheel: If wheel is bent or damaged, replace it to prevent vibration.

Note: Severe noise usually warrants motor and/or wheel replacement.

Medium 3/5

Indoor Blower Motor and Wheel

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