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F6-00

F6-00 — OU: Abnormal high pressure in cooling

Daikin · ASHP Error Codes

What does F6-00 mean?

The system is experiencing abnormally high pressure in the outdoor unit (OU) during the cooling operation.

Common Causes

  • Blocked outdoor coil airflow
  • Overcharged refrigerant
  • Faulty pressure sensor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the outdoor unit's air filters and coils are clean.

  2. 2

    Check for any obstructions around the outdoor unit.

  3. 3

    Do not attempt to release refrigerant.

  4. 4

    A qualified technician must diagnose and fix high-pressure issues.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

7H-017H-01 — Water flow problem7H-047H-04 — Water flow problem during domestic hot water production7H-057H-05 — Water flow problem during heating/sampling
Source: Daikin ASHP Error Codes
Open Manual (Page 3)Search more codes in this manual