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Indoor Unit Fan Abnormal Noise and Vibration

Likely causes

Foreign object contacting fan blade or scroll — friction noise at low speed

Check: Stop fan rotation and inspect scroll interior with flashlight → check for foreign object contact marks or scratches

What to do: Remove foreign object → check fan blade for deformation and replace if needed → re-verify noise after cleaning and test run

Fan motor bearing wear — noise increases at high speed operation

Check: Check fan motor shaft play for 0.1mm or more → listen to noise pattern change when switching low→high speed

What to do: Replace fan motor → re-verify fan blade balance → measure current after replacement to confirm normal range

Indoor unit body mounting screws loose — resonance vibration

Check: Lightly touch body during operation → check for vibration change → check all mounting screw torque (4–6 N·m)

What to do: Re-tighten all mounting screws (4–6 N·m) → check and replace vibration-damping rubber pads → re-verify installation surface level

Field tip

Distinguish cause by noise speed pattern: low speed = foreign object friction, high speed = bearing wear, all speeds = resonance vibration.

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