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F20

F20 - Outdoor compressor overheating protection

Panasonic · Aquarea Heat Pumps

What does F20 mean?

The compressor tank temperature has exceeded 112°C, causing overheating protection to activate. This has occurred 4 times within 30 minutes. The OFF/ON LED will blink.

Common Causes

  • Compressor tank temperature sensor fault
  • Clogged expansion valve or strainer
  • Insufficient refrigerant
  • Outdoor PCB fault
  • Compressor fault

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the compressor tank temperature sensor.

  2. 2

    Inspect the expansion valve and strainer for blockages.

  3. 3

    Verify refrigerant levels.

  4. 4

    Ensure adequate airflow around the outdoor unit.

  5. 5

    Contact a qualified installer or service technician.

Browse all codes in this manual (69)
Verified technical data. Last updated: April 2026

Related Faults

2 beeps then pause2 beeps then pause - Overfill warning3 red flashes3 red flashes - Communication errorError Code DisplayError Code Display - Abnormality detected
Source: Panasonic Aquarea Heat Pumps
Open Manual (Page 76)Search more codes in this manual