F8
Fujitsu
Current Sensor / Overcurrent Detection Error
Indoor unit shows F8, unit may stop during heating or cooling under heavy load
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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
Defective current sensor on outdoor PCB, Shorted compressor or fan motor, Wiring short to ground, Faulty inverter module
How to Fix / Troubleshooting
Safety first: This error involves high-voltage and high-current components. Only trained technicians should perform electrical tests. Always isolate power at the disconnect.
- Visual inspection: With power off, inspect outdoor wiring for obvious shorts, burnt insulation, or loose connections.
- Check motors: Ensure outdoor fan spins freely and shows no signs of seizure.
- Technician tasks:
- Measure insulation resistance of compressor and fan motor.
- Test current sensor output and replace if faulty.
- Check inverter module for damage.
- Component replacement: Depending on findings, replace the faulty motor, compressor, current sensor, or entire outdoor PCB.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor PCB Current Sensor
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