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AC has a bad smell

Musty or foul odour when the AC is switched on.

Why this happens

  • Mould or bacteria on a damp cooling coil
  • Dirty filters holding old dust
  • Stale water sitting in a clogged drain
  • Cooking or smoke smells absorbed over time

Safe checks you can try

  1. Clean and fully dry the air filters
  2. Run the AC on Fan mode for 10-15 minutes to dry the coil
  3. Check the drain is not holding stale water
  4. A deep coil clean or anti-bacterial service clears strong musty smells
A burning or plastic smell is different: switch off immediately and get it checked, it can be electrical.