Fujitsu Outdoor Unit Not Running

Indoor fan runs but compressor and outdoor fan do not start; only room air is circulated

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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

Tripped outdoor disconnect or breaker, Faulty outdoor PCB, Failed compressor or outdoor fan, Communication error between indoor and outdoor units

How to Fix / Troubleshooting

Safety first: Turn off power before opening any outdoor covers. High voltage is present.

  • Check outdoor disconnect: Ensure the outdoor disconnect switch is in the ON position and any fuses are intact.
  • Listen for outdoor operation: When the indoor unit calls for cooling/heating, check if the outdoor fan or compressor attempts to start.
  • Inspect wiring: Verify that the interconnecting cable between indoor and outdoor units is intact and properly connected.
  • Technician diagnostics: If the outdoor unit remains off, a technician should check for error codes at the PCB, test the compressor and fan, and verify control voltages.
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Repair Difficulty

Hard 4/5

Required Part

Outdoor Main PCB
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