F11 (18 LED flashes) - Compressor operating outside normal parameters

What does F11 mean?

The outdoor unit's LED1 flashes eighteen times, indicating the compressor is operating outside its normal parameters.

• Refrigerant issues (e.g., too high or low pressure)
• Compressor mechanical malfunction
• Electrical supply problem to the compressor
• System blockage affecting compressor operation

Click steps to track your progress.

1. 1

   Turn off the AC unit at the main power supply and wait at least 30 minutes.

2. 2

   Ensure the outdoor unit is clean and has unobstructed airflow.

3. 3

   Restart the unit. If the error reoccurs, contact a qualified AC technician immediately.