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AC making noise

Rattling, buzzing or grinding from the indoor or outdoor unit.

Why this happens

  • Loose panel or screws vibrating
  • A fan blade hitting dust or slightly bent
  • Worn fan bearing or motor
  • Compressor sound from the outdoor unit

Safe checks you can try

  1. Notice when the noise comes: at start-up, while running, or at high fan speed
  2. Check the outdoor unit is firmly fixed and not touching a wall
  3. Make sure nothing (leaves, plastic) is stuck in the fan
  4. A rattle or grind that stays needs the fan or bearing checked
A sudden loud grinding or buzzing: switch off and get it checked before it damages the motor.