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F4

F4 - Abnormal high temperature of refrigerant oil

Daikin · Air Conditioning

What does F4 mean?

The oil within the compressor has become excessively hot.

Common Causes

  • Low refrigerant charge
  • Overheating compressor
  • Faulty oil temperature sensor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the outdoor unit has proper ventilation and is not overheating.

  2. 2

    Check air filters and clean the outdoor unit's coils.

  3. 3

    A service technician needs to diagnose the cause of the high oil temperature.

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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