Fujitsu Overheating Electrical Component or Wiring Fault

Burning or electrical smell from indoor or outdoor unit

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.

Possible Causes

Loose electrical connections causing arcing, Overheating fan or compressor motor, Failing PCB components, Foreign object contacting heating elements or resistors (if equipped)

How to Fix / Troubleshooting

Safety first: Immediately turn off power at the breaker or disconnect if you smell burning. Do not continue operating the unit.

Visual inspection: After the unit cools, inspect accessible wiring and boards for burn marks, melted insulation, or discoloration.
Do not ignore: Do not resume operation until the source is identified; continued use can cause fire.
Call a technician: A qualified technician should inspect all electrical components, tighten connections, and replace any damaged parts.

Repair Difficulty

Professional Required 5/5

Required Part

Indoor or Outdoor Main PCB

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