F8
Airwell Current Sensor or Overcurrent Detection Fault

Indoor unit shows F8; unit may stop and not restart; sometimes associated with power factor or current sensing.

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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 transformer (CT) sensor, Loose CT wiring to PCB, Short circuit in compressor or fan circuit, Faulty outdoor PCB current sensing circuit

How to Fix / Troubleshooting

Safety: This involves high-voltage current sensing. Only visual checks should be done by non-professionals. Always isolate power at the breaker.

Steps:

  • 1. Visual inspection: Remove the outdoor panel and locate the current sensor (often a ring-shaped CT around one of the power wires).
  • 2. Check wiring: Ensure the small wires from the CT to the PCB are intact and firmly connected.
  • 3. Look for shorts: Inspect compressor and fan wiring for obvious shorts, burnt insulation, or loose terminals.
  • 4. Professional testing: A technician should measure compressor and fan winding resistance and verify current draw during operation. If the CT is faulty or the PCB misreads current, those parts must be replaced.
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Repair Difficulty

Professional Required 5/5

Required Part

Outdoor Current Sensor (CT) or Outdoor PCB
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