F9
Airwell EEPROM / Configuration Data Error

Indoor unit displays F9; system may not start or may shut down unexpectedly.

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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

Corrupted EEPROM on indoor PCB, Incorrect PCB replacement without proper configuration, Voltage surge or static damage, Manufacturing defect in memory chip

How to Fix / Troubleshooting

Safety: Turn off power at the breaker before accessing the PCB.

Steps:

  • 1. Power reset: Turn off power for 10–15 minutes, then restore. If F9 clears temporarily, note any pattern of recurrence.
  • 2. Check PCB history: If the indoor PCB was recently replaced, verify that the correct Airwell part number was used and that any required configuration (DIP switches, jumpers) matches the original board.
  • 3. Visual inspection: Look for damage around the memory IC on the PCB (often a small 8-pin chip).
  • 4. Professional reprogramming/replacement: EEPROM faults usually require PCB replacement or reprogramming with Airwell service tools. Contact an authorized service center.
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Repair Difficulty

Professional Required 5/5

Required Part

Indoor Main PCB (EEPROM Section)
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