F11, F28 - Compressor Position Detection Circuit Fault

What does F11, F28 / LED1 flash 18 or 19 times mean?

The system cannot detect the normal position of the compressor rotor. This can be caused by incorrect or poor wiring to the compressor, or the compressor itself may be damaged. The outdoor unit's LED1 will flash 18 or 19 times.

• Faulty wiring of the compressor (incorrect or poor connection)
• Faulty compressor
• Faulty PCB (Printed Circuit Board)

Click steps to track your progress.

1. 1

   Turn off the main power switch to the air conditioner before checking any connections.

2. 2

   Carefully check the wiring connecting to the compressor for any loose, incorrect, or damaged connections.

3. 3

   Ensure all wires are securely seated.

4. 4

   Turn the power back on and restart the unit with the remote control.

5. 5

   If the fault persists, contact a qualified technician, as the compressor or PCB might be damaged.