SMEG Outdoor Mechanical Noise / Compressor or Fan Issue

Loud humming or knocking noise from outdoor unit when running

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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.

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Possible Causes

Loose outdoor unit mounting bolts, Fan blade hitting shroud, Worn outdoor fan motor bearings, Noisy or failing compressor

How to Fix / Troubleshooting

Safety first: Switch off power at the isolator before touching the outdoor unit.

  • Check mounting feet: Tighten bolts securing the outdoor unit to its base or brackets. Add rubber pads if vibration is transmitted into the building.
  • Inspect fan clearance: Ensure the fan blades are not contacting the grille or shroud; gently bend back any deformed metal.
  • Listen to compressor: A loud knocking or metallic noise from the compressor may indicate internal damage; this requires professional evaluation.
  • Clean fan blades: Remove debris and dirt buildup that can unbalance the fan.

If noise persists and appears to come from the compressor body, contact a technician; compressor replacement may be needed.

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Repair Difficulty

Medium 3/5

Required Part

Outdoor Fan Motor / Compressor
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