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L4

L4 - Fin temperature too high

Daikin · Air Conditioning

What does L4 mean?

The temperature of the unit's fins has exceeded 93°C.

Common Causes

  • Failed sensor.
  • Short circuit of airflow.
  • Blocked airflow.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Clean the air filters of the indoor unit and the condenser fins of the outdoor unit.

  2. 2

    Ensure there are no obstructions to airflow around the unit.

  3. 3

    If the error persists, a sensor may be faulty or there's an airflow problem requiring professional service.

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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