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F6

F6 - High pressure in cooling or over charged

Daikin · Air Conditioning

What does F6 mean?

High pressure is detected in the system during cooling, or the unit is overcharged with refrigerant.

Common Causes

  • High pressure detected by outdoor coil sensor.
  • Refrigerant overcharge.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the outdoor unit's condenser fins are clean and unobstructed.

  2. 2

    Verify that the cooling load is appropriate for the unit's capacity.

  3. 3

    Contact a qualified technician to check and adjust the refrigerant charge if necessary.

Browse all codes in this manual (79)
Verified technical data. Last updated: April 2026

Related Faults

A0A0 - External protection activeA1A1 - Indoor PCB failureA2A2 - Malfunction of freezing protection
Source: Daikin Air Conditioning
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