F9
Midea Defrost Sensor or Defrost Protection Fault

Unit displays F9; may be associated with abnormal defrost or heating performance

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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

Faulty outdoor coil sensor, Incorrect defrost sensor placement, Outdoor PCB defrost control failure, Ice buildup preventing accurate sensing

How to Fix / Troubleshooting

Safety first: Turn off power before touching the outdoor unit and sensors.

Steps to check:

  • 1. Inspect outdoor coil and base: Check for heavy ice buildup. Clear snow and ensure base pan drains are open.
  • 2. Verify sensor placement: Confirm the coil sensor is properly clipped to the coil and not hanging loose.
  • 3. Clean around sensor: Remove heavy ice carefully by allowing it to melt; do not use sharp tools that can damage tubing or sensor.

When to call a technician: Persistent F9 suggests a sensor or PCB defrost logic fault. A technician should test sensor resistance and defrost operation.

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Repair Difficulty

Hard 4/5

Required Part

Outdoor Coil Temperature Sensor
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