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E4

E4 - Low pressure

Daikin · Air Conditioning

What does E4 mean?

The low-pressure switch in the outdoor unit has been tripped.

Common Causes

  • Low pressure switch tripped.
  • Refrigerant shortage.
  • Airflow issues.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check that the air filters in the indoor unit are clean.

  2. 2

    Ensure the outdoor unit has adequate airflow.

  3. 3

    Contact a technician to inspect refrigerant levels and potential leaks.

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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