R-Pro › Field cases › Air conditioning
AC Indoor Unit Noise / Vibration — Blower, Blade, Cabinet Check
Likely causes
Check blower bearings, blade balance, cabinet mounting
Check: Blower bearing wear = grinding noise. Blade = lost balance weight or asymmetric dust = vibration. Cabinet = direct mount on wall amplifies resonance. Vibrometer (ISO 10816, residential <4.5 mm/s RMS). Find source = touch by hand to feel strongest point.
What to do: Power OFF, hand-spin blower = check smoothness. Bearing fault = replace entire blower module. Blade = verify balance weights + clean dust. Cabinet = add vibration-absorbing pads at wall mount. Filter/blade cleaning at season start reduces vibration 80%.
Indoor vibration = main sleep-disturbance complaint. Filter/blade cleaning at season start cuts vibration ~80%. Add vibration-absorbing pads at wall mount. Bearings hard to swap = replace entire blower module.
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