F20 — Outdoor compressor overheating protection

What does F20 mean?

The outdoor compressor has overheated, and its internal protection mechanism has activated. This occurs if overheating happens 4 times within 30 minutes, causing the OFF/ON control panel LED to blink.

• Faulty compressor tank temperature sensor.
• Clogged expansion valve or strainer.
• Insufficient refrigerant in the system.
• Defective outdoor PCB.
• Faulty compressor.

Click steps to track your progress.

1. 1

   Turn off the power supply to the unit at the main breaker and allow the compressor to cool down for at least 30 minutes before restoring power.

2. 2

   Ensure there is good airflow around the outdoor unit and no obstructions are blocking the vents.

3. 3

   If the error persists, contact a qualified technician to check refrigerant levels, the expansion valve, or the compressor.