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Error Code
The C0 error code indicates that an external protection device in the indoor unit has been activated. This typically means that the air conditioning system has triggered a safety feature to prevent damage or hazards.
Voltage fluctuations or power surges can trigger the external protection device.
Devices like circuit breakers or safety relays may cause the fault.
Loose or damaged wiring between the indoor and outdoor units could trigger this error.
Turn off the air conditioner at the power switch, wait 5–10 minutes, and turn it back on.
Ensure that your unit is receiving stable power, and external devices aren’t interfering.
Look for any loose or damaged wiring.
Refer to your Fujitsu manual for additional troubleshooting steps specific to your model.
